I live full time in my van and need a reliable power supply. Its ironic that the BMS is the one thing that's stopping me switching from AGM to Lithium. I know many people who have lost total power because the BMS has sensed some kind of problem. No warning, no understanding what's happened, just total loss of power. The BMS should send a warning before it just shuts down. Having the risk of a total power failure in my van is not an option.

Is there a specific BMS for each type of battery or will all BMS’ work with any battery?

I wanna upgrade to these. 16 cells 24 volts. How many BMS would I need? And how to monitor every single cell like you have? And bms connects to charger and inverter same point?

witch one should i buy for Sonar ( fishing ) I need minimum 28AH LifePO4 Battery ( 5x 3.2v ) i need the smallest possible setup. The sonar use 1ah of energy.

Hi I need your opinion. I have the same volt and ah bms but it is not written lifepo4 on it. Nevertheless i tried to use it and if I measure the lifepo4 cells have without bms 12 volts...but if i measure with bms the value shown is 8.6 volt... Bms is damaged? Thanks in advance!

Have you ever tested the overvoltage cut off threshold of the bms while charging with an mppt CC? ....after being disconnected from the battery by the bms i guess it will ride at the pv ocv...will this high ocv damage the bms at reconnect point??

@Cooldipo

2 жыл бұрын

I noticed my 100A bms does not protect my battery from overcharging coming from a 600watt panel (4 units of 150watt). 100Amps bms cells now have big belly (cc is a must from now on, BMS doesnt have all the basic covered)

My DALY BMS 15v 100A Just Flamed Up and Burnt all the Red Wires !

How do you choose the correct BMS amp rating for the battery you intend to build? Is the rating based on how many amps you expect to draw as a maximum or is it determined by the constant and/or maximum current discharge rate of the cells?

@SolarPowerChannelwithChris

3 жыл бұрын

Your not the only one to ask this. I must do a video on it! It's the maximum amount of amps you expect to draw. For an example for a 4s LiFePO4 running a 1kw inverter 240v I would use a 100 or 120amp BMS. By also taking into account the efficiency of the inverter to. Use this website to punch number in to give you an answer. www.rapidtables.com/calc/electric/Watt_to_Amp_Calculator.html If you up your battery volts 12v to 24v, it will lower your amp draw off the battery. This will increase the life of your batteries. What we call C rating, rate of discharge.

@MartinRaz1

3 жыл бұрын

@@SolarPowerChannelwithChris - Great videos and great answers! Are there any disadvantage in oversizing the BMS? Other than price when buying? I have a system, where I expect to draw 800W max - but if I use a air fryer in my van, it will draw 2kW So if not using a fryer - I could go with 75A But if using the fryer I need approx 175

@SolarPowerChannelwithChris

3 жыл бұрын

@@MartinRaz1 Yes that's right. No need getting a 200amp BMS if your not pulling them numbers, waste of money. Always take into account the losses in inverter and system. I have found a 800watt inverter can pull nearly 100amps still.

@JunginaMotors

4 ай бұрын

​@@SolarPowerChannelwithChris❤

I think I shorted out my bms by disconnecting the balance wires before unplugging it. The voltage now reads 9.5 v with bms connected. Is the bms reparable?

@SolarPowerChannelwithChris

3 жыл бұрын

I have a new video which may wake it up. It should be fine disconnecting the balancing leads I would of thought.

hi chris. great channel. I want to buy 4 x 200Ah cells and set them to 14 volts. how many amps should the BMS have? should i buy the 250Ah version?

@shelay

3 жыл бұрын

I have 4 200Ah LifePo4 cells connected up as a 12V supply. I use a daly 100Amps BMS and works really well. I never draw more than 50Amps at any one time. It has never gotten warm whilst in use but then again, I mainly use it to power routers, soldering iron, phones, laptops and small electronic. I also use it with a 1500 pure sine wave inverter. Provided you are not drawing a large amount of current continuously, you should be grand.

@fritz_the_superkraut

3 жыл бұрын

@@shelay thank you chris. I'll work out how much Ah I need as a maximum. one more question. are the cells also balanced with the Daly BMS? or do I still need a balancer? where did you get the display to see the voltage of the individual cells?

@SolarPowerChannelwithChris

3 жыл бұрын

@@fritz_the_superkraut thank you for your comment, yes I believe the Daly BMS does balance. I did e mail them a few months back to check with them. Failing that an active balancer can be fitted. Yes let us know what your batteries are powering. To work backwards a good website I use is www.rapidtables.com/calc/electric/Watt_to_Amp_Calculator.html 1000 watt inverter at 13v say pulls 76amps. 100amp BMS will be good. As per the comment above me said. Hope that helps.

@fritz_the_superkraut

3 жыл бұрын

@@SolarPowerChannelwithChris Thank You 👍

Hi gentlemen...I have 105ah I can uesd 100 bms ? Please if can help me...thank you

hi, i have the same bms. but when we put the solar and start charging it, we hear the bms producing low humming sound. is it normal? thanks

@SolarPowerChannelwithChris

3 жыл бұрын

I've never heard one hum. The charge current correct for the BMS? As discharge and charge are not the same.

I have that exact same BMS. Would you know how to reset it? My cells are all reading between 3.31 to 3.33 volts but the BMS itself is only putting out 3.3 volts and won’t accept a charge from my SCC.

@SolarPowerChannelwithChris

3 жыл бұрын

Try shortening out the B- and P-. Touch them together. Don't be offended, you sure you have the cells wired in series?

@guyfromboracay

3 жыл бұрын

@@SolarPowerChannelwithChris Thanks for the reply! I'm pretty sure I do. Taking my multimeter to the cells' terminals I get 13.3v, but when I take a reading from the P- wire and the positive terminal of cell #4 all I get is 3.3v. Scratching my head trying to figure this out, I hope my BMS isn't broken.

@SolarPowerChannelwithChris

3 жыл бұрын

@@guyfromboracay sounds like you have it wired in correctly (series) Your balance leads wired correctly? As that can stop a BMS putting power out.

@guyfromboracay

3 жыл бұрын

@@SolarPowerChannelwithChris I'll have to double check the balance wires. I suspect that since they wires are just pinched under the hex screws I might not be getting good contact. Locking them in there with soldered ring terminals might be the solution. Again, I appreciate the help!

You state they should never be charged higher than 3.6v per cell, but I thought they were rated at max 3.65v charge rate per cell? Is that not true?

@SolarPowerChannelwithChris

3 жыл бұрын

Yes and no, it's to do with stressing the cells. You can dramatically reduce a LiFePO4 cell charging at that voltage to full capacity. There are scientific papers showing a big drop in cycle life. It's hard when making a video, I can go off on one chatting and people switch off. So I try not go off topic to much.

Can I use 48v bmw for 24v battery and just leave the rest of wires?

@SolarPowerChannelwithChris

9 ай бұрын

Hello, no. The BMS will not work as it will see 0v and do a disconnect.

How do you correctly size a BMS to your things you want to run?

@SolarPowerChannelwithChris

3 жыл бұрын

What do you plan on running in watts? Also what voltage? From that you work your amps. There are online calculator tables.

@Veveve1

3 жыл бұрын

@@SolarPowerChannelwithChris thank you can you point me at one?

@SolarPowerChannelwithChris

3 жыл бұрын

@@Veveve1 I leave links in my video descriptions to help.

How do l know if l need a 100A BMS or a 200A one…..l am new and do not understand

@SolarPowerChannelwithChris

6 ай бұрын

Normally by a maths. You can count how many watts your pulling. Count from the devices your using, normally a sticker on the appliance. Use a watt to amp calculator. It will ask for volts. 12 or 48v..

Do I need a bms on every battery in my system?

@SolarPowerChannelwithChris

3 жыл бұрын

Thanks for watching. Yeah, on each pack.

Is this lifepo4 bms compatible with lithiun or li-ion batterys?

@SolarPowerChannelwithChris

2 жыл бұрын

Hello thanks for watching, this one is only for LiFePO4. You will need one for Li-Ion. This is because the two have very slightly different parameters for low and high voltage disconnect. You can buy them, if your struggling to locate. Let me know.

@elgringodelasscooters9616

2 жыл бұрын

@@SolarPowerChannelwithChris yeah but can u set the parameters to cut off when voltage is certain low level right? And same as voltage high it can be set right?

@elgringodelasscooters9616

2 жыл бұрын

@@SolarPowerChannelwithChris oh and we accidently order lifepo4 bms instead o li ion

Good audio 😅