Yes please parallel all 3 battery types at 24 volts and graph the charging/discharging curves. Excellent idea. Thank you for doing these tests.

Smashing test Andy, just what we wanted to see. And with such a massive difference in capacity, and a comparatively low difference in internal resistance, it was still nice to see the BMS protecting the palo cells. And due to the tiny capacity, 1 or so charge-off/on cycles seemed to have equalized the batteries enough to make it work. Smashing experimental result indeed. Wills latest 19" teardown had a BMS with active current limiting. Once all BMSes have that, it really does not matter anymore what capacities you tie together, it will just handle it. You could then even just attach batteries with vastly different voltage/charge levels and it will equalize at safe levels.

This summer I was driving with my camper van for 4 weeks with 3 banks in paralell 2x50Ah + 2x70Ah lead acid + 293Ah LiFepo4 . All were charged from solar panel 3x400W + alternator via regulator of 45A. Only LiFepo4 was managed by a Cargey bms with MosFet relay of 300A (separate charge discharge) Charging voltage 14.2 volts I did it just to test and had no issues with this. The Lead acid batteries have now been discarded and will be replaced with a new LiFepo4 bank at 24V 460Ah

Please don't take this the wrong way, but let's not proliferate the use of the term 'Eddy current' for this. It's terrible that Orion decided to use this term. There is a very specific definition of Eddy currents (loops of electrical current induced within conductors by a changing magnetic field in the conductor according to Faraday's law of induction), and it doesn't make sense to call these currents between cells that way.

@luc_libv_verhaegen

2 жыл бұрын

Andy currents ;p

@kenl6880

2 жыл бұрын

I completely agree. I learn so much from Andy's channel as I'm sure many others do too. I look forward to the next video as soon as the one I'm watching ends. I noticed the misuse in the last video and thought it was a mistake and not a misunderstanding of the term so I didn't comment. You very tactfully pointed out the error. Thank you for doing it better than I could.

@upnorthandpersonal

2 жыл бұрын

@@luc_libv_verhaegen Call them Frog Amps for all I care, just not something that is already an established term for something very specific in the electrical world.

@JR.M.S

2 жыл бұрын

Let’s call it Andy current then! Ohh I just saw that Luc Verhaegen beat me to the point :)

@dennis_m

2 жыл бұрын

@@luc_libv_verhaegen I totally Agree, From now let's call it Andy Current. Best suggestion.

Andy, I really appreciate this very educational series of 2 videos! You have explained and answered several questions I have had for awhile, as I educate myself on Lifepo4 battery technology to upgrade my travel trailer (or as you call it there, my caravan). Thank you!

@OffGridGarageAustralia

Жыл бұрын

Thanks for your feedback, Ron. I much appreciated that. I had a lot of questions about LiFePO4 myself and started doing my own testing as I could not find any answers either. It's w win-win for all of us.

Thank you Andy, i've been looking for a video as i have 4 Lifepo 300Ah in series 48v that replaced my 4 Lifepo 100Ah in series 48v(1month old only as i wanted to test before to buy a bigger bank) now i see that i can parallel both battery bank and get 400Ah, to have 20kwh, really appreciate your content.

@OffGridGarageAustralia

2 жыл бұрын

Yes, absolutely. As long as it is the same voltage, you can safely parallel them.

You're simply an excellent tutor, very careful, tact plus humor.

@OffGridGarageAustralia

Жыл бұрын

Thank you very much!

I've been anxiously awaiting this video! This was a great idea to test!

Thanks for these tests Andy, I'm also keen to see the charge curve of parallelled LFP and Li-ion batteries. This is the best way to learn!

@OffGridGarageAustralia

2 жыл бұрын

Thanks Chris, I'll get something done then...

Andy, As always a great video. I learn the most from your channel. Keep up the good work. Your Awesome

Bonsoir ANDY, enfin libre pour une superbe détente technique sur ta chaine ! merci pour cette démonstration sur le mise en parallèle des batteries lithiums.

I am thankfull for this test. I made my own 24volt/36ah lifepo4 battery. I was having 24volt/50 ah battery already connected to solar inverter. After watching this video I dare to parallel my hand made battery with existing 50 ah battery and its working. The precaution I took I charge both batteryies to same voltage level. Thanks for this video.

@OffGridGarageAustralia

Жыл бұрын

Thanks for sharing. Yes, once thy have the same voltage you can safely connect them in parallel.

Thanks Andy, for putting all this together. We are top balancing our 100ah cells now, getting ready to add them to the 280ah bank.

Thanks Andy 🙂 great video! This kind of good information is exactly what I needed for my current project.

Very cool test! I'm very interested to see what the charge/discharge curve of the mixed chemistry setup. Keep up the good work! :)

@OffGridGarageAustralia

2 жыл бұрын

Thank you Joe, I'm curious too!

Love this video, very good research. The best I have seen

@OffGridGarageAustralia

Жыл бұрын

Thanks a lot. I wanted to know if this works and could not find any information, so I had to do the test myself.

This is great stuff. I am looking to add another bank to my 14.4kWh. I assumed the 2 battery banks would self balance. Looks like you are proving that right. Would love to see the different chemistry test.

Nice experiment, learning a lot.

Thank you for this/these amazing videos. This one answered a question I have been pondering about for years (not so many years actually, I got interested in diy and batteries for about 4 years ago). Yes please do the 24v test with li-ion and lifepo4! I saw a KZread video a while ago from some boat guy talking about AGM and lithium. He did have them in parallel and he thinks it’s a marriage made in heaven. The lithium pack keep his AGM healthy and his AGM pack stoped the lithium pack from reaching any critical voltages. (If I remember right).

@siddo326

2 жыл бұрын

KZread - emily and clark's adventure, he talks about it. Wildebus combined AGM and LiFePO4 in to a bank and recorded the data.

I wouldn't use separate banks without a BMS in place for each bank...great content!

I have been doing parallel on chevy volt,nissan leaf,ford c max and ford escape for years now with no problem,however I gave away the ford c max and ford escape, I now added 2 tesla model s pack and 16 life po4 and they all work fine///thanks for sharing your video

@OffGridGarageAustralia

2 жыл бұрын

Thanks for sharing

Thanks your videos helped me a lot.

Can't wait to see the lithium ion and lipo4 test

Thanks very much sir. I really appreciate this test

Großartiges Video. Irgendwie hatte ich immer Angst vor Riesigen Ausgleichsströmen. Super dass Du das schonmal getestet hast. ;) Lg Stefan

i have had 7s li-ion in parallel with lead acid i just charged to the max voltage of the li-ion another setup i had was 12v solar to the lead acid then from the lead acid buck/boosted converted down to a 3s li-ion setup and then ran loads from the li-ion this worked very well and helped to stop the heavy sag on the lead acids

Good job 👌

Nice test! 👍🏻

So much good information thanks Andy! But i had a sudden thought what would happen if despite the different capacity in the two banks what if they had the same resistance?

Excellent video, was wondering the same thing on how to combine battery packs for future expansion. Would be very interested in a 24v test. Thanks

When mixing gel/liion/lifepo4 it is better to have 2x or 3x gel than others total capacity. Also keeping charging current at all batteries total charging current gives perfect results. Mixing is not ideal but sometimes it is required :) Thanks for the video. Waiting for the next one. Good work! :)

@OffGridGarageAustralia

2 жыл бұрын

Thanks for the info!

Love the videos Andy, my question is could the eddie current cause damage if the temperature was below freezing. If so what about balancing currents, could they also cause damage if below freezing.

BMS for my 24V Li-Ion battery bank has been the biggest problem for me at higher amperage. I am in a 6S configuration to get my 24V battery bank. Each Leaf pack has two cell groups in series (with a center tap for the series connection). 6S-24V BMS at 150+ amps are difficult to find and even harder to find for a "programmable" BMS like you use for your LiFePO4 cells. Making individual batteries at lower amperage for each battery pack would make it easier to find a BMS that would protect and balance each cell better. It will be interesting to see your experiment with different chemistries in parallel, Andy. I raise a SPAT to you for all of your work.

Now as it is set up it would be great to see a full capacity test to see if the palo battery actually does add total capacity to the larger eve battery or if the parasitic draws and inefficiencies actually reduce the total eve capacity

Fantastic info - I can't seem to find Part 1 anywhere. Looking for the Lead Acid EVE combo - please

@OffGridGarageAustralia

Жыл бұрын

Part I is here but it's not about paralleling lead Acid and LFP. This video series is still to come... kzread.info/dash/bejne/mIWumdiTdbyylrw.html

Excellent videos and appreciate all the testing you've saved me. Please review the term Eddy Current. It is not appropriate for use in battery systems. AC induced currents.

I would love to see the results for paralleling of Li-io and LiFo 24v. Thanks for all your hard work Andy. You are the best!

@leonhardtkristensen4093

Жыл бұрын

I will warn you about doing that as they have different voltages. The lowest voltage will charge first and when it is full the BMS will (or should) disconnect. Then the other battery will charge. Internal resistance also has things to do with it to decide when the charging happens. Li--ion batteries have 3.7v a cell meaning to get 24v (or there about) you must have 7 cells for 25.9v. LiFePo4 are 3.2v giving 25.6V. Well it might work as they are close. I am using LiFePo4 in parallel with Lead acid batteries on 24v and so far have had no problems. I have not done any big testing - just using. When the sun is shining the charging voltage is sitting between 28 and 30v so I believe all will be charging. In the dark (right now in the evening) the battery voltage is 26.3v (remote online reading). This is at the farm and as I am not there the usage is only about 3.5KWh/24h. At home I have a different set with just LiFePo4 (6x12v135Ah 2s3p) but they are of a different brand. They have over the last few days been charging up to 28.4v with a current of .4A. Max has been 19.2A at 26.3v from 1000w solar. Maybe the panels should be cleaned but it is winter here so the sun is not as strong.

@OffGridGarageAustralia

Жыл бұрын

I will do this in a future series. Also adding lead acid as a third battery. Will be interesting how far we can go.

@leonhardtkristensen4093

Жыл бұрын

@@OffGridGarageAustralia Thanks Leon. Also as you have the equipment for testing (and may need contend for future video's) I would like you to test the active equalizer from PowMr HA02. Each string appear to be separate and can be connected to up to over 12v and there fore can equalize 12v batteries in series not just 3.2v or 3.7v cell's. I have one and it appear to work fine on 4 x 12v LiFePo4 batteries in series. As a pensioner I can't really afford or justify the cost of all the test equipment.

i've done lifepo4 and lead acid combo for several years . seemed to work . now that i have enough lifepo4 capacity i'm pulling out the lead acids.

Thanks Andy, Good one

@OffGridGarageAustralia

2 жыл бұрын

Glad you enjoyed it

Great test. Do you expect different behavior when both packs are on a low state of capacity??

Great video! I was looking at getting some of the pre-made basen 12v 100ah batteries. The listing says that they support a maximum of four batteries in series or parallel. Do you know if there is a specific reason for doing so?

@OffGridGarageAustralia

2 жыл бұрын

I was in contact with Basen and they actually wanted to send me one for testing once they solved the parallel/series problems they had with them. I'm not sure if you can parallel and series them at the same time to build say a 4s4p pack out of their 12V batteries.

Please continue these sorts of tests! I just disconnected my 24V lead acid bank for my house and replaced them with a set of lithium iron phosphate. The lead acid batteries definitely have some life left in them, and until I can upgrade everything to 48V this would be a good solution! Here is one challenge you will need to resolve: The high amperage/voltage equalization charge for lead acid batteries to reduce calcification. I suspect this could be achieved with one bank of solar panels/charge controller going directly to the lead acid bank and using a circuit/relay to disconnect it from the lithium banks when it detects the voltage/current condition, but diodes might be involved to keep it from sensing the voltage of the lithium bank in the first place. Or you could just throw caution to the wind and manually equalize charge them manually from time to time I suppose.

Great videos, why not parallel them before bms? It should work the same, right? Thanks from Portugal.

Dein Zangen-Multimeter braucht 'ne neue Batterie! ;-) Sehr gute Videos, bitte weiter so!!! 👍🏻

LFP parallel to NMC, Yes, I am in for that test :D

When you did the charge test where the EVE was higher than the Palo, I think the Palo was taking much more current proportionately to where it was before. So I think you've proven the point you wanted to prove even if you didn't like the way the test looked.

Fantastic video do the 24 parallel banks test , different chemistries

@OffGridGarageAustralia

Жыл бұрын

Yes, I will!

I have been following your channel now for several months and it has been EXTREMELY helpful in educating me on LiPho battery technology. I want to build a 608ah battery for my boat using the QSO EVE 304ah cells that you reviewed. Should I do 2 - 4s batteries , each with its own BMS or a 4S2P with one BMS? I like the idea of monitoring each of the 8 cells (with the 2 x 4S configuration ) and also the redundancy if a BMS fails. Would you see any advantage of going with the 4S2P configuration? Thanks so much for your advice.

@OffGridGarageAustralia

Жыл бұрын

I would always have a BMS for each battery bank so you can take one battery offline and keep the others connected to your loads

Doing a test of my own and would appreciate your input. Using 1 Ampere Time 12v 100ah and 1 Redodo 12v 100ah, and currently charging them together in parallel, once charged I will leave them connected together in parallel for 12-24hrs and then disconnect the parallel connection and check the voltages, if they are the same and there is no current flowing between the two batteries I will then hook them up in series to make a single 24v 100ah battery for my Growatt 3000 system. Any issues with charging them together? I am charging with 25a of current, both batteries have a 100a BMS in them, I am unable to monitor, if I were a betting man I would bet both batteries came from the same factory in China.

I have a 100ah 12v L4 battery, so I could add >100ah in parallel without too many issues ?

Was there ever a part iii made? I can't find it. I want to see that.

Excellent content Andy, so in theory if one were to run lifepo4 & li-ion in parallel, while discharging it will take the 4s li-ion voltage down till its even with the lifepo4 then both banks will be discharging somewhat equally? My new bms should be here today, I am def going to run both banks and see how it goes. I've heard so many horror stories that I felt it just wasn't worth the risk but if they both have a good bms it should work out fine. Haha we will def see tonight. Hopefully. Keep it up Andy I'd love to see you run this test though for shits n giggles. Take care, stay healthy

I tried this but I had same battery same chemistry same wh same all same bms but I had two separate battery packs with their bms well one was discharge in purpose to run a test , well the fully charge only put 22watts or around 1.2 ish amps to the other discharge battery , and this batteries accept on regular lifepo4 charger upto 20A of charge and same discharge c rating but why didn’t the bms accept more current draw and intake , was it cause of the IR?

fla and lifep04 might work at certain volt ranges (24 and others) but you need to limit the fla top and bottom volts (bms) you might test whether you can use one of your bms to limit the low/high volts for the fla 21 and 28 volts and see what happens. will it work? good test for you to try

hi @Off-Grid Garage, I have a little issue here .... Im testing my cells with the EBC-20A ZKETECH ... 2 cells 3.33V @100ah connected in paralell (it should give me 3.33V @200ah, If I understand good) ... so but in my discharge /charge tests I ran, it just discharged 110ah and charged 110ah .... I dont understand why I am not able to put in the 200ah ... could you please give me a small advice? .... what I am doing or understanding wrong? .... thanks a lot in advance

Great video Andy, was anxiously waiting for these results! So the Palo BMS cuts out and reconnects in a cycle and keeps on changing intermittently, interesting. And Andy, why do you call the current flow between the batteries Eddy Current? I thought Eddy Current is related to electro magnetic induction, anyways I could be wrong. Thanks.

@upnorthandpersonal

2 жыл бұрын

It's something I believe Orion (from Orion BMS started). It's terrible. See my other comment. Call them Frog Amps or something, but let's not use a term that already has a very specific meaning in this field.

@dennis_m

2 жыл бұрын

@@upnorthandpersonal Oh I just saw your comment, Frog Amps also makes sense since the current is jumping from one battery to another, but another viewer suggested Andy Current. I guess Andy Current it is from now.

@mozismobile

2 жыл бұрын

equalisation current made sense, but Andy only said that occasionally. Better to call it Dave Current or something rather than Eddy

@johthe

2 жыл бұрын

Andy please stop calling it eddycurrent, that hurts what we already know abot it. Could call it equalisation-, charge-discharge -current, or if you still want to make something up, call it andy- or frog- current as suggested by others here. /Johan

@TrevorFraserAU

2 жыл бұрын

Keen to see the lead acid paralleled with any other lithium just to see what happens. I have learnt so much. Thank you. Any one I would like to see is the earthing of your new battery shelf. Are you going to use a dedicated earthing rod etc. Thanks again.

Nice battery schematic

Hi. I have two 12v lithium batteries with each having their own bms. Is it possible to join then to get 24v or will the bms in each battery not like that

Heya oh yeah a test with differant types of batteries would be great I even have some polymeer normal 3.7volt and 10A would like to know if that would work too

Andy, thanks for your very informative video's on using LiFeP04 batteries. I'm currently using 8 12.8v 120ah in 2 parallel strings for 48 volts, just got 8 more identical batteries to double my days of autonomy, living here in North Idaho USA. They are connected to 12 Phono Solar 370 watt solar panels. One comment I want to make is concerning your issue of not getting to use solar to run loads when the batteries are full, and the sun is out, and that is I bought a MPP Solar (Taiwan) inverter charge controller LV 6548 (UL listed) that allows me to set priority of power source when a load is applied to the inverter. Setting 1 is Solar first, battery assist 2nd if Solar is not enough ,and it also has a charge connection to my house panel so it will automatically charge the batteries when they get to low on volts. It appears your Victron does not include this setting. In fact, this inverter controller can be run without batteries hooked up, just off solar. Keep up the great video's!!

I’m curious about the same test for batteries with different capacities connected in series.

I appreciate your thoroughness Andy. Have you tested the Bank Manager yet?

@OffGridGarageAustralia

10 ай бұрын

No, and I probably won't. I'm not a fan of mixing different battery chemistries. Especially not LA and Li.

Mr Andy please I have 8pcs of 100w panels of same brand, can I connect them in parallel to a 12v 3k inverter and a 100a mppt charge controller to a 12v 220ah battery??

1. What happens when discharging and Palos BMS hits low voltage disconnect? What happens to current/voltage at busbar. Will Eves still push your headlights? 2. What do you think of a heat gun to draw current? 3. In the Paulo array, what happens when one cell gets defective and only charges halfway. Does the entire array only charge halfway reducing array capacity like my golf cart?

I'm running 48v LFP (280ah) and SLA(100ah) in parallel. BMS on LFP only. They work well together with similar charge curves.

Hi Andy, We like see the test lion, LifePO4 & lead acid battery in parallel. But in two ways 1) Same amp hr 2) Diff amp hr

@OffGridGarageAustralia

2 жыл бұрын

OK, no worries.

Is this effect due to the difference in internal resistance has between the two battery packs? High the resistance less of a load the lower the resistance more of a load.

@OffGridGarageAustralia

Жыл бұрын

Yes, exactly. The internal resistance is determine the current.

I am interested in seeing the curve. I have a 16s lifepo4 and a 14s lipo together I run them from 48 to 57.7. I have wonder what the curve actually looked like.

@GrapeOnWheels

Жыл бұрын

Any trouble so far? I've connected 15s fifepo4 and 13s li-ion together today, and am wondering about the potential battery to battery circulation in my ebike. Please kindly give an update

Hey! Cool das es alles so wunderbar funktioniert! Ich hab eine Frage! Ist es auch genau so gut möglich 2 Bms's parallel zu schalten? Mein Plan ist für meinen Camper einen 4S lifepo4 2x280ah Akku zu bauen. Und ich brauche viel Ampere zum Kochen! Ein test wäre super cool von dir und würde mir bei der Planung sehr weiterhelfen! P.S. Würde einen separaten Shunt verwenden

Can you parallel Daly BMS with a non Daly BMS the outputs ?

if victron solar controller connects these parallelly connected lifepo4 batteriy banks, how the controller would behave? or maybe the matter of each bms, which is no problem?

@OffGridGarageAustralia

2 жыл бұрын

You need a controller for each set of batteries.

OK, possibly a very dumb question...I have 2 202Ah 48v batteries with their own BMS each. I am looking at buying 2 SOKs 100Ah 48v batteries with their own BMS each. My current batteries and the SOKs have almost the exact same voltages across the board. Will it work to parallel all 4 batteries on the same busbar if I can't access each battery's BMS to modify settings?

Great video, thank you I was thinking about connecting multiple batteries in parallel What would happen if one battery bank disconnects by BMS due to overcurrent and stays disconnected up until the second battery bank discharges 80%DOD And then BMS of the first battery decides to hook it up. It'll lead to a significant ( 10V ) difference between 2 battery banks and current between these banks could become larger than overcurrent protection which will make BMS to start working in trigger mode - ON, overcurrent, OFF, timeout, ON overcurrent, OFF If we talk about 1000Ah ( 5*200Ah ) battery banks - the system could become unstable a lot

@OffGridGarageAustralia

Жыл бұрын

The voltage difference should not go over 10V as you said. From what I can see in my three parallel batteries now, the difference is only 2-3V in an extreme case and can lead to around 200A for a few seconds.

Would be interesting to see this battery fully charged, and discharging it with like 1C current (300A) for say 10 minutes and turning the load off - what the equalization current would be?

!!ANDY PLEASE READ!! I love your experiment videos and was hoping you could do a similar trial on the feasibility of using your buck-boost converter (used in a previous video) connected to a parallel solar string to charge a higher voltage 48v battery. I cannot find anything on the internet to shed light on this aside from solar dc-dc optimizers like soar edge and tigo ts4, which I think are fairly unspoken solar "instruments" more diy'er should use/know about. Your viedoes are awesome man keep it up! I look forward to starting a similar chanel in the next few weeks once my EVE's come in from china. Best regards - Patrick

I want to add a battery to my electric scooter. stock battery lion i want to add battery lifepo4.both 36volt but stock 5.5 amps lifepo4 12 amps. Is there any problem if I connect them with money. Can I charge the lifepo4 package with the stock charger. Will it damage the motor driver?

I came up with a distributed battery system for a sailboat. For instance, main batteries, then a distributed battery for a VHF radio, and a distributed battery for refrigeration. The main batteries are connected as normal. A diode isolator and a 3 Ohm 25W resistor are in-between the main batteries and each distributed battery. I think this would work with Lithium as main batteries and AGM as distributed batteries because Lithium has a higher voltage.

I do that for my PV system almost 2 year with 3 different chemistry.. 100Ah 8S LFP, 200Ah 7S Li-ion, and 28 Ah 2S Lead Acid (very small current pass through lead acid batt). In my experience sometime overcharge happened to lead acid battery if Li-ion SOC at high level but it's very rare because charge and discharge Current is close enough.

Can i connect two different battery banks which are not connected together to one inverter

I am thinking that it would be easier to couple a LiFePO4 and FLA battery bank by AC coupling rather than coupling the DC side. I'm thinking you would need to have so many measures in place to condition the power and prevent back-feeding power due to the difference in resting voltages of LiFePO4 & FLA batteries. - but I might be wrong. It is a great idea for testing !

Hi there I have watched your video. I just want to ask if I can parallel 2 daly bms with same amperage but different model. The first one is ordinary bms and the other one is smart bms. Will it work fine? I'll be glad if you humbly answer my question. Thank you

@OffGridGarageAustralia

Жыл бұрын

Yes, that will work but it's not ideal because they have different settings and respond differently.

@danteaguila6772

Жыл бұрын

@@OffGridGarageAustralia thanks for the nice info sir very much appreciated. By the I have set it up and I'm observing it. It's been 2 days and I haven't encountered any problem. I've been using it on my small set up 24v 190ah. I think my setup was pretty complicated because I use different brand of batteries. Both lifepo4 but different ah. One is 90ah sinopoly and the other one is BYD cells 102ah. I hope I will not encounter any problem sooner.

Daly has BMS's especially for parallel banks. Every BMS has an extra device which are connected together. What do think about these?

@OffGridGarageAustralia

Жыл бұрын

Not necessary as we know now. I have three battery banks in parallel and there is no additional 'device' needed.

Thanks!

@OffGridGarageAustralia

Жыл бұрын

Thanks a lot, Mark. I appreciate your support!

Can anyone explain or confirm theories of why you cant series connect some batteries for 24v-48v? Is it that cheaper batteries & BMS’s may use a lower voltage (or Grade) of MOSFET’s that may only handle the 12v range. Another great video and comment and theories Andy, all good info in gaining a proper understanding of how the different batteries, chemistries and BMS’s all work together. I think this is another win for V=IR isn’t it! It was clear in the maths when you showed the internal resistances between chemistries, and how they reacted to additional charge variations.

@OffGridGarageAustralia

Жыл бұрын

Some of the BMS cannot withstand higher voltage and are only designed for one battery. You need to confirm with the BMS manufacturer if you can series connect them.

Hallo my respected friend Andy, An other issue that might be of interest of RV owners is the following. To reduce the relative instant power consumption (not the total, but more the consumption over time) , I have reduced this instant power consumption by adding a Skottky diode in the live connection of the boiler in my coffee machine (Senseo) and so reduced the relative power consumption by 50%. Off course it will take twice of the time to heat up the machine, but my inverter has enough spare power to feed other loads, when necessary (example a water heater asking 800 Watt at the same time). I have tried this with a Victron 3kW Multiplus, but the Victron Multiplus is humming and ratlteling if his live is ended.. In short this is beyond what could be assumed from the high quality of Victron. All other (high frequency) CN inverters do not have any problem in feedings the load with a half sinus or/and a dimmer. Perhaps this is an item for our followers of your channel. Regards, Peter

I have tested a 24Ah 24V LiFePO4 with 100A 12V lead acid. As the LiFePO4 is at a higher voltage they supply the bulk of the current. Only much later does the LA provide more. Charging is the same. Due to lower resistance most current goes to the LiFePO4.

What would happen if we added lithium and less acid in parallel as voltages are abit different 😅?

greetings.. this BMS is for any 2.3v - 3.2v - 3.7v battery ????????? and it also works for lifepo4 and li-ion... that's what I don't understand because the BMS will use it as a balancer not as a charger... other things when it says 48v I can use it for 12v the ground is specific for 48v... EVERYTHING IS CONFUSED WHEN IT'S TIME TO BUY

Andy So according to this experiment i can connect in parallel my two Valence 138 Ah batteries, with my two smaller Valence 40 ah. batteries As long as the voltages are the same with the 138 and 40 ah lithium iron magnesium phosphate (LFMP) batteries ? BTW both battery banks have their own internal BMS

@OffGridGarageAustralia

2 жыл бұрын

If they are pre-made batteries, I'm not sure and would go with what the manufacturers says. Some manufacturers say their batteries cannot be paralleled or set in series. Do you know what's in the specs?

@mannyfragoza9652

2 жыл бұрын

@@OffGridGarageAustralia yes i have the specs Ill have to go back over the data sheet and make sure. Im not saying im going to try this tomorrow but who knows maybe sometime down the road i might instead of buying more batteries

Andy, I'm concerned about the how and what if a bank of 4x95amp/hr FLA's were to be connected in parallel with a bank of 320amp/hr LiFePo4's? It is obvious the 2 are nominal 12V and the fully charged Voltages are very close to each other. I want to do this with an off grid system for an RV as the Li's seem to have a little better cold temp performance than the FLA's and obviously the power density is way better for the Li's. In the end game, I want to have 2 inverters, 1 smaller unit to run some of the continuous draw low levels and a larger LF unit to run the heavier loads on part time draws. I will be getting multiple charge controllers that will be linked by paralleling RS485 cables to balance them. There will obviously need to be a BMS for the LiFePo's (4 to 8 320's) in a parallel/series setup. I was thinking about using a blocking diode arrangement between the FLA's and the Li's which would drop the voltage .8 to 1.7 V, stopping the Li's from back feeding to the FLA's unless I needed to using some type of relay system. Since the LiFe's appear to tolerate being at 60% to 80% better than the FLA's ( I think ) this seems to be a pretty complicated project.

Since you can parallel LFP with LIION, it would be interesting if you could put a LFP bank in parallel with the model 3 battery to increase the range. Put in the frunk or subfloor. 360 or 400V bank required of course. 400V would be 125S, 50Ah would be 20kWh.

113021/1153h PST 🇺🇸 120121/0553h Brisbane 🇦🇺 Good day to you, Andy. Thank you for the successful test /experiment on dissimilar batteries (amps) in parallel to charge / discharge sequence, under extreme care. This experiment proved that such batteries (cells) could be incorporated into the system without peril and anxiety. There are high amount of misconceptions, vague and baseless comments floating around in YT by the Warriors, warning that such a process is not acceptable or calamitous to the setup. What made your procedure that proved otherwise (success) was by incorporating BMSs’ into the circuit. (that the Warriors did not know about) Thanks again for the proof and relief to users of 18650s of dissimilar current ratings*. I’m not too sure about how flooded batteries play a role in such tests! * in 18650 combinations, similar or close to similar Amps is needed for each cell banks (packs) is known.

I should check my cells one day maybe next month

it was great to see thia as I am in the process of replacing my lead batteries..8 of them already have 2 100 Lithium phosphate hat are 4 months old and wondering IF I can just add 2 more of them but new..Your thoughts would be greatly appreciated folks

@OffGridGarageAustralia

Жыл бұрын

Yes, that should be totally fine as long as the voltage is the same (12V, 24V or 48V system). The capacity will not matter as we have seen. Also make sure, that each parallel battery has a fuse/DC breaker before connecting to the DC bus.

Has anyone tested or Vote for common scenario in RV/Boat: larger ah Lifepo4 (House) Bank paralleled with smaller AGM / Lead Acid (Starter) batteries permanently (concern about AGM lower resting voltage acting as constant load discharging LFP) vs temporary parallel with Victron CT only when charging. Also, replacing AGM with 12v 4S Headway 38120 8ah 20C LFP parallel with 4S 12V Eve 1C 100ah to 300ah LFP in car/RV/boat if Headway would provide the majority of current to starter when cranking or would Eve experience overcurrent?

how About parallel different capacity & extreme C rate different?

Sounds like you could parallel a 100ah and 200ah chins battery with no issues if the bms limits current like your external bms does.

Clark from Emily & Clark's Adventure is working on a device that controls connected lithium and lead batteries. Have a look at their channel where he also shows an interesting air conditioner project.

I have 2 - 100AH AGM batteries in parallel and a 12volt - 1500 watt Inverter. It has it's own 20 amp charge controller that is charged by a Tesla 24v Battery. I have the same voltage converter as you set for a maximum of 10 amps. The Tesla battery is charged by a Victron 100/20 charge controller that is powered by a 30 volt grid powered Meanwell power supply, also limited to 10 amps. This is a stand by system if I loose power. If I loose power, I can switch to my Solar Panels that run grid tied inverters but then charge the Tesla by solar.

As long as you have BMS's in each battery set up you can charge any chemistry that you want is long as you don't go over voltage and if you do the BMS will shut off I've got all three I've got to AGM, lithium ion and lithium iron phosphate and they're working great they'll only take whatever it takes to charge them up and then they shut 📴 and the charge controller also shuts off