YOU ARE MAKING IT EASY PESY TO UNDERSTAND.

This was amazing, very well put together.

thanks for your information

Great intro videos. Do you mind sharing your spreadsheets you used for calculations through the series?

Thanks for valuable informations. I just bought a solar pump system. The pump voltage is 216 dcv. My question is: written on the Mppt controller that the pump voltage is 288 v , not 216, is that ok?

When sizing an MPPT controller do you not need to add the 25% safety margin? I'm planning to use 2 x 275w panels in series charging two 12v batteries in parallel. Therefore 2 x 275W = 550W / 12V = 45.83A So can I use a 45A controller or do I need a 60A controller with some safety margin?

@AltEStore

7 жыл бұрын

Correct. Because MPPT charge controllers can manage the output better than PWM charge controllers, you can oversize the solar array a bit and not damage the equipment.

Hi Alt store, thank you first of all making me better understand the PV solar technology. I have a case of total Load =450 Watt. With available 3 PV panel of 250W each with spec Vmp 30.2V, VoC 37.42V , Imp=8.3. To begin with , I am planning to use 24V, 3KVA hybrid inverter with builtin MPPT Amp =80A, operating Voltage range =120-450 VDC. Since using 3 series panel my VoC will be 112 V. In this case , will this MPPT charge controller- fire up to charge the 24V,120AH battery?

Effective vedio

MPPT output 60Amps but can we really charge one 12V battery with 60Amps? Since battery have their own Charge Rating

In Pure Hybrid system where only sun hrs utilize, and also battery backup. we can did the Math for the no. Solar panels required. but how much PV will be add for solar charge Controller.

what if you live in EU and u get Bisol solar panels

Can you wire six12 solar panels to a 40 amp mppt charge controller to used on a 12 volt battery bank

@AltEStore

8 жыл бұрын

+Ledwin Ford It depends on the size of the 12V panels and the specs of the charge controller. For example, these 12V 80W panels www.altestore.com/store/Solar-Panels/altE-Poly-80-Watt-12V-Solar-Panel/p10352/ have a short circuit current (Isc) of 4.85A. 4.85AIsc x 6 panels x 1.25 NEC safety = 36.3A. So yes, you can have six 80W 12V panels into a 40A charge controller. What's even better is that, depending on the specs of the charge controller and the location of the system, you may be able to wire them all in series. That would allow you to have one string of a higher voltage and lower current on the wire going from the solar array to the the charge controller (6 x 22.1Voc =132V x 1.1 temperature compensation (down to 32F) =145V (most MPPT charge controllers can handle up to 150V). If it is very cold there, below freezing, then you may need to do two parallel strings of 3 in series, which is still a heck of a lot better than six panels in parallel.

Thanks for your great information. I am building a system that will have a 24 volt battery bank with 12No. 250 watt panels. The panels have a Voc of 37.8 volts and an Isc of 8.28 amps.........Unfortunately there are trees occasionally casting partial shade on different panels throughout the day. To minimise the effect of shaded panels bringing the rest of the panels down in a large series I am thinking of creating six series of 2 panels in each series by using six small mppt charge controllers (capable of taking 75 volts and 10 amps each). Do you think this will work? And if you do would I just fuse each charge controller and connect them straight to the battery bank or do I have balance them out in some way?

@AltEStore

6 жыл бұрын

As long as all of the charge controllers are the same and are set to the same settings, it should be fine to have them each with their own breaker and parallel the outputs. The best option is to use charge controllers that will actually communicate with each other, like the Midnite KId, but that might be more than you are looking for. Note that you need each charge controller to manage 20A, not 10A. 250W x 2 = 500W / 24V = 20A.

@johngillbert5489

6 жыл бұрын

altE thanks for your reply and thanks for the correction on the size charge controller. I've seen another of your videos on the midnite kid and they look great but as you say a bit over rated and therefore too expensive for the job.

Nice easy to follow info,doing a short course on solar power system,wish you were my teacher.Came across some info on the web about blocking and by-pass diode on the series and parallel strings for the panel to cut off power consuming panel etc.Do you have a video dealing with this topic?Just came across your video series,cheers good job.

@AltEStore

8 жыл бұрын

+CLIFTON RICARDO RUSSELL Thanks. We don't have a video on blocking and bypass diodes yet, but thanks for the suggestion. I'll put one together and post it here when done.

@cliftonricardorussell1704

8 жыл бұрын

+altE Store Cheers,can't wait.

@cliftonricardorussell1704

8 жыл бұрын

Cheers, thanks much.

@AltEStore

8 жыл бұрын

+CLIFTON RICARDO RUSSELL Here's the updated link to the diodes video you requested. kzread.info/dash/bejne/Z6aN25KgeL3LoKw.html

Nice. So, in sizing PWM, the formula goes like this? Isc of panel x # of strings x 1.25? and in MPPT, Total watts of array divided by system voltage? Thanks.

@AltEStore

8 жыл бұрын

+Aleneski Kalashnikova For MPPT, total watts / battery voltage x 1.25.

i have few questions and your help would be highly appreciated exmple 48v batery 1) if i have a charge controller with (v) range upto 450v and 80(A) and i have a 330w panel with vmp 37.5v and imp 8.8 amps and Voc 46.8v can i make a combintion of 7panels in series (46.8x7=327)and then 4 such paralel connectionswil give curent(4*8.8=35.2)nominal voltage of panel in this case would be(24*7=168) so i m lying with in the range can i make this cmbination. 2) take same exmple system is 9240w, 9240/48v batery will give 192.5 A this tells that my controller should b around 195-200A but in step 1 i used the same thing and was in the range.so if i go with 80a controler would that clip extra amps and give outpt of 80a. 3)if i make 5 paralel combinations of 72 cell panel that gives 8.8a imp.as paralel conection will add up the curent so will get 44a after cliping the panel voltage if we get factor of 2.5,, then 2.5*44=110a,i asume that it will clip the extra amps. 4) most inverters have built in mppt charge controllers so same will happen for them right?

@AltEStore

4 жыл бұрын

1 thru 3) Charge controllers are rated by the voltage in and current OUT. To figure the amps output, you would divide the wattage of the solar array by the voltage of the battery bank. Or, inversely, to see how big of a solar array you can fit, multiply the amps out by the battery voltage. So in your example of a 80A charge controller for a 48V battery bank, 80A x 48V = 3840W max solar input per charge controller. The voltage in is based on the Voc of the panel plus extra room if it gets cold where you are. Here in northern USA, we may add as much as 25%. So if you are looking at a 72 cell panel, the Voc is probably around 45V. If your charge controller can handle up to 450V, 450V / 45Voc = 10 panels. But that's only if it never ever gets cold. 9 in series would be safer. To figure out how many panels you can have, you take that max wattage input of 3840W / 330W panels = 11 panels max. That is too many in series for the charge controller, so you would have to have 2 parallel strings of equal length. So that brings you down to 2 parallel strings of 5 panels in series, for a total of 10 panels at 3300W. 4) most of the inverters that have MPPT are grid tied inverters, so it is not using it to charge batteries, just feed the grid. That is changing, as there are some hybrid inverters coming out that does both, like Sol-Ark and Outback Skybox. If that is the case, then an external charge controller is not needed, it is built in.

Hello! I have a question that suppose we are planning to run a 1 HP water motor used to deliver the motor, how much surge current factor should we add while designing our system? in general, how to calculate the surge requirement used by the motor to start itself if its not mentioned on the motor specs.?

@AltEStore

6 жыл бұрын

You are right, figuring out surge is difficult. I'll often search online for generator calculators, they often list surges. It's not a perfect solution, as your motor may be different, but it's a good starting point. This one says the surge is probably around 2000W. www.northerntool.com/shop/tools/buyers-guides_wattage-calculator

When designing system for 1168 W using MPPT. Can we use 2 strings with 2 X 315 W in each string as we did in PWM. As there 315 * 4 = 1260 W and we need so the current will be 1260 / 48 = 26.25 A We can then use TS-MPPT-30 operate perfectly inside the limits of the controller

@AltEStore

7 жыл бұрын

I'm assuming the 315 are at least 72 cell (24V) panels. If so, yes, that would work.

hello. can you please explain if the solar array wattage is greater than the PV input power for the mppt solar charge controller , how can i connect the them ?

@AltEStore

4 жыл бұрын

The MPPT charge controller is rated by the amps output. For example, 2000W ÷ 24V battery bank = 83A. So you need at least an 80A charge controller. If the array is too big to fit on one charge controller, you must use more than one charge controller, connected to the same battery bank in parallel.

Hi altE store! Thanks for previous feedback. I am still confused about some basic concept: 1) A 72 cells solar panel has 24V nominal voltage, Voc is 44.62V. If 3 of them in series = 72V nominal voltage, Voc is 133.86V. (a) Could I still charge a 48V battery bank (if from the point of view of nominal voltage)? (b) if 6 panels in series = 144V nominal voltage, Voc is 267.72V. If using Midnite Solar Classic 250, which max Voc is 298V. Can I still charge my 48V battery bank at this 144V nominal voltage? (c) Can I say that, no matter how large the nominal voltage is, as long as we are not exceeding our Voc, the MPPT charge controller can down size the nominal voltage to whatever nominal voltage of battery bank? 2) If I use a AC-DC charger to charge my battery, for instance, IOTA ENGINEERING DLS-30 30A: (a) Would it burn my solar charge controller (eg. Midnite Solar The KID, 30A MPPT Charge Controller), if the charger amp is larger than solar panel input amp? (b) Could I use the charger to charge when inverter and solar MPPT charger is on? or need to turn them on first? Thank you.

@AltEStore

6 жыл бұрын

Great questions. 1a) As long as the Voc of the panels in series is below the max Voc for the MPPT charge controller, the charge controller will reduce the output voltage to the correct voltage to charge the battery. it will also increase the current output, so that minimal power is lost. For example, if the input is 100V and 10A, the output is 50V 20A. 1b) Don't pay too much to nominal voltage in this case. It is really just used as a guideline to show what panels can be used to charge batteries. For example, a 72 cell "24V panel" can be used to charge a 24V battery, or 2 in series can charge a 48V battery. Since MPPT charge controllers came along, it's not as important, because as long as the voltage is higher than the battery, the MPPT will change it to the required voltage. With the Classics, the max voltage means absolute last chance before blowing up. It will turn itself off in the HyperVoc range to protect itself. So if you design it to always be in that range, the charge controller will always be off. Not a good design. I wouldn't do more than 5 in series in warm climates. They have a great string sizing tool, you should try it. www.midnitesolar.com/sizingTool/displaySizing.php 1c) As long as the Voc is in the correct range, the MPPT charge controller will adjust the voltage and current. Note that a PWM charge controller will not change the current. That's where you have to pay attention to nominal voltage and match the panels to the battery bank. 2a) You can use an AC charger, either stand alone or as built in to an inverter/charger, with a solar charge controller. Unless the equipment is all the same brand and communicate with each other, i.e. Schneider's Xanbus or Outback through the hub, it is difficult to manage which equipment will be doing the charging and when. So you run the risk of the AC charger filling up the battery at night, and then when the sun comes up in the morning, the batteries are full, so the solar charge controller just stays off, wasting all that beautiful solar energy. But it won't damage anything. It can be controlled a bit if voltages are configurable, and you make sure the AC charge controller only comes on when the battery bank is very low. 2b) They can all be on at once.

@joeyap5246

6 жыл бұрын

Thank you very much for the explanation, very clear now! :)

How do you size the charge controller if you have large off-grid system (more than 50kW)? What is the maximum size of charge controllers? (input voltage and current). If the size of the system increases do we need to use multiple charge controllers?

@AltEStore

9 жыл бұрын

Hi Umid M In large systems, multiple charge controllers are used, each controlling a subset of the solar array. The maximum size of commonly available charge controllers is the 96A Midnite Solar Classic (www.altestore.com/store/Charge-Controllers/Solar-Charge-Controllers/MPPT-Solar-Charge-Controllers/Midnite-Solar-Charge-Controllers/Midnite-Solar-Classic-150-MPPT-Charge-Controller-150V-96A/p8753/). Depending on the size of the solar array, you would have one charge controller for approximately every 15 solar panels, 5 parallel strings of 3 in series. Each charge controller would be connected into the battery bank through its own breaker. Note that a system that size will have many issues to consider and should be designed by a professional solar designer to ensure code compliance.

@drsolar

8 жыл бұрын

+Umid M Another option is by using a PV Inverter and direct the input to a battery inverter as you would a generator. Sunny island PV inverter can handle up to 11 kw each.

@AltEStore

8 жыл бұрын

+AtlanticWastePower You are right for adding batteries to a grid tie system, AC Coupling is another option. However, Umid was asking about an off grid system that wouldn't have a grid tie inverter. Due to the limitations of AC Coupling, DC Coupling, using solar charge controllers instead of a grid tie inverter, would give you the most control. For more on AC and DC Coupling, you can see our other videos at kzread.info/dash/bejne/ia5r1KyPYKezn84.html and kzread.info/dash/bejne/p4WFzdmvopzAds4.html

hello. can you please explain the 150Volt limit while sizing MPPT charge controller?

@AltEStore

5 жыл бұрын

The Voc of the panels in series cannot be higher the the input voltage limit. If the limit is 150V, and your panel has a 40Voc x 3 in series = 120V. 4 in series would be too many (160V)

@kamleshsahoo20

5 жыл бұрын

@@AltEStore thanks.

How many charge controllers would I need for 15 310w solar panels?

@AltEStore

5 жыл бұрын

It depends on what voltage battery bank. Hopefully with an array that size, you would be using a 48V bank. So 310W x 15 panels = 4650W / 48V battery bank = 96A. So you could use one 96A or higher MPPT charge controller with 5 parallel strings of 3 in series (depending on the voltage of the panels and charge controller). If you have smaller charge controllers, you could do 3 parallel strings of 3 and 2 parallel strings of 3 on two 60A charge controllers.

Kyocera 240 * 3 = 720 W and limit of the MPPT was 750 W. If the temperature goes down to -26 Celcius, Will it cross 750 ? If so then why we have used this MPPT

@AltEStore

7 жыл бұрын

Most MPPT charge controllers can handle more than their wattage rating, as long as the volts are below the upper limit. This means it can usually handle more amps. But it will limit the output to the rated amps, so even if you put more in, it will clip the output to its limit.

Amy. you mind letting me know best way too hook up 6 100 watt panels to a 40 amp mppt controller but keep 12v battery bank? Thanks

@AltEStore

5 жыл бұрын

40A may be a little too small for 600W. In most cases you'll be fine, but under perfect conditions, it may clip and you won't get the max power. 600W / 12V = 50A. You won't damage anything, so if you already have the charge controller, you're fine. As for how to wire them, it depends on the voltage of the charge controller. If it is at least a 100V input charge controller, and you have minimal shading issues, you can wire it as 2 parallel strings of 3 in series.

@JSmith-wy3yh

5 жыл бұрын

@@AltEStore so hook 3 together Parallel x2 then hook the 3 and 3 together after? And I'm hooking these panels up all on a west roof so I dont think I will max them out. I have 0 shading. Thanks Amy

@AltEStore

5 жыл бұрын

@@JSmith-wy3yh hook 3 up in series, plus to minus, plus to minus, then connect the first pluses and the last minuses in parallel.

@JSmith-wy3yh

5 жыл бұрын

@@AltEStore ok I got it now. Thank you

@TriativeHD

3 жыл бұрын

​@@AltEStore Am not sure 600W / 12V is correct, I noticed something like that in the video too. 6, 12V 100W panel connected in series 600W / 72V = 8.33A. if connected in parallel then it 600W / 12V = 50A but then again in 3S-2P configuration (300W / 12V) x 2 = 16.66A So expect all 6 panel is connected in parallel I believe the 40A MPPT Controller is within spec.

5:08 what is the safety factor and how can we find or calculate the safety factor? Please let me know asap. Thanks.

@AltEStore

5 жыл бұрын

National Electric Code (NEC) says that devices that run for 3 hours or more are considered "continuous use" and therefore can only run at 80% of its rating. So by multiplying the current by 1.25, you will size the equipment properly to only run at 80%.

@sanchezboy8654

5 жыл бұрын

@@AltEStore but is it a constant? Because I can't find the safety factor value in the region I live. I live outside US, so I never heard of it. But is it must to multiply the current or multiply the Short Circuit Current (to find what fuse to attach) by safety factor?

@AltEStore

5 жыл бұрын

It depends on what the rules are in your area. Here in the US, it is 1.25.

Why we limited the MPPT upto 150 V in a string when 39.4 X 4 = 157 A and then we used three panels in a string.

@AltEStore

7 жыл бұрын

The charge controller specs tll you the voltage limit for that controller. Four of the panels were too high for the 150V limit, so we had to back down to 3, which is under the 150V limit, even when we factored in the cold.

@zeryabhassankiani3481

7 жыл бұрын

Is it possible to have a charge controller that can with stand Voc higher then 150V. If so then why we did not used that?

@AltEStore

7 жыл бұрын

Yes. Midnite Classic 200 and 250 can go to 200V and 250V. Their current output is a little lower than their 150V version. Magnum has a PT-100 that can go up to 240V at 100A. Schneider and Morningstar have 600V charge controllers. They cost a bit more than 150V ones.

@zeryabhassankiani3481

7 жыл бұрын

Thanks a lot for all the quick replies, You people are great.

Hlo sir, can you explain how to connect multiple inverters in multiple batteries. 2.how to connect more number of mppt in multiple battery bank? My question is how to battery bank split in multiple inverter and mppt charge controllers?

@nbalaji7681

3 жыл бұрын

Hi admin sir explain to my doubts

Thanks Alte store, a very good tutorial for off-grid solar power system design. I have 2 questions: 1) Could I connect 3 panels with nominal voltage 24V in series => 72V, to charge 48V battery with MPPT charge controller? Is it too big difference? 2) Some MPPT charge control;er mention these: Max. input voltage = 160Vdc Overvoltage protection = 150Vdc Input voltage recovery points = 145Vdc What is it all about? What will happened if the input voltage is greater than 160 Vdc, for instance 165 or 175V? This is the system I am designing based on limited number of panels and battery. Any advice? ibb.co/m4s5zF Thank you.

@AltEStore

6 жыл бұрын

The max voltage listed on a charge controller is for Voc + temperature compensation. Silicon panels' voltage goes up when it gets cold, by as much as 25%. So you need to figure in the voltage for the coldest it will ever get during the day in your area. So if you are in the tropics, three 72 cell panels in series should be fine. 46.2Voc x 3 = 138.6V. But if you are any place that gets close to freezing, then the voltage can get too high. High voltage into a charge controller will generally damage the capacitors in it, usually causing smoke to come out (that's bad). Midnite Solar's Classic has a mode that will protect itself and turn off if the voltage gets too high. It also is available in higher voltage models, 150V, 200V, or 250V. Note that if you do use a higher voltage, you need to make sure your breakers between the panels and the charge controller are also rated for higher voltage. Most are only rated for 150V.

@joeyap5246

6 жыл бұрын

Thanks for the reply! :) I have another question, I post in a new reply so if anyone has same issue can view it easily.

What is voltage correction factor for my multi crystaline module? How to calculate it? Specification of modules are, maximum power (Wp = 225) , power tolerance (±3%), Vmp (26.66V), Imp (8.44A), Voc (33.60V), Isc (8.9A) Thermal Characterstics: Temperature coefficient of Pmax = -0.43%/°K Temperature coefficient of Isc = 0.046%/°K Temperature coefficient of Voc = -0.33%/°K NOCT = 45 ± 2°C Operating Conditions: Max. System Voltage = 1000 VDC Safety Class = II Maximum Series fuse = 15A Operating Temperature = -40°C to +85°C

@AltEStore

7 жыл бұрын

Here in the USA, we use National Electric Code's (NEC) Table 690.7. www.mikeholt.com/instructor2/img/product/pdf/14SOLB-1229-sample.pdf (page 5). For example, if the temperature gets as cold as -20C, you would use 1.18 as the correction factor. So 33.6Voc x 1.18 x number of panels in series. For 1 panel, it's 39.6V. But for real numbers, you can use the temperature coefficient from the spec. -.033% per kelvin from 25C. So in the same example, -20C is 45C colder than 25C, so (33.6Voc x 0.33% x 45) + 33.6Voc = 38.6V. You can see that the NEC calculation is a little higher than the one for that particular panel.

@zrakeshz1

7 жыл бұрын

Here in India at my place, temp. never falls below 5°C, so I have to consider my worst case , So voltage correction factor could be, (33.6Voc x 0.33% x 20) + 33.6Voc = 35.81V Am I right? or I don't have to consider correction factor as temp never falls below 0°C?

@AltEStore

7 жыл бұрын

You are right, you always want to factor temperature in.

@zrakeshz1

7 жыл бұрын

altE Thanks. your videos are great help to me.

:-)

Needs correction please Wh. night= 8,000 [Load calculated during night time] Wh. day = 10,000 [Load calculated during day time] Sun hr= 7 Eff= 70% Ambient temperature =10 deg C to 40 deg C 1) a) Power needed to charge bat. Bank (Wh. night/7)/eff=1632.7 Watts No of 250W x 24V Panel to charge bat. (Watt/250)= 6.5 say 8 b) If using 200Ah x 24V battery then required bat Amp (Wh.night/24)= 333.3 Ah [divide by eff or not?] Battery DoD= 50% Required Ah (Ah/50%)= 666.7 Ah No of 200 Ah bat. (required Ah/bat Ah)=3.3 say 4 (2 strings x2) 2) a)Power needed for load at day time (Wh.day/7)eff= 2040.8 Watt Panel 250W x 24V=> No. of panels (Watt/250) = 8.2 Say 8 b)Total No of Panels=16 No. 250W x 24V (4 strings of 4 in series) 3)Total Wattage of array = 16 x 250 = 4000 Watts a) Inverter required wattage (with built-in charge controller)= 5000 Watts (25% extra of total Wattage) b) Inverter (with charge controller) Input Voltage (4*24)= 96 V c) Inverter (with charge controller) Input current,if Isc=8.88 (4*8.88)= 35.52 Amp

@AltEStore

6 жыл бұрын

You need to correct the sun hours, especially if this is year round. I don't know of any place that has 7 sun hours for more than a month or 2. Go to this site and enter your country and closest city. solarelectricityhandbook.com/solar-irradiance.html If this is year round, I'm betting sun hours in the winter is closer to 5. So I'm going to use that in my calculations. Your total load is 18kWh. 18,000 / 5 sun hours / 70% efficiency = 5143W of solar needed. So you need closer to 21 250W solar panels. SIzing the battery bank, even with day time loads can be interesting. Yes, you'll be using much of the power as it is being made, so you won't store it all, but you do need to figure some of that power will be going into the battery bank, so you can't just store the night time use. So I'm going to use the whole day's number, 18kWh. You also didn't figure for any days without sun, or partial sun, we'll go 2 days, even though it is more common to do 3. This also helps because your daily battery use will be 25% instead of 50%, only occasionally using 50%. This will make your batteries live twice as long. 18,000Wh / .92 inverter efficiency x 2 days without sun x 1.19 10C / .5 DoD / 48V battery bank = 1940Ah 48V You can see my number is much higher than yours. Because you are using much of the power during the day, you can get away with a little smaller, but not as small as your calculations. I don't know of an inverter with a built in solar charge controller. An inverter/charger has an AC charger to charge the batteries from the grid or a generator when needed. You will need a separate solar charge controller. You'll need around a 100A charge controller for all that solar. The inverter voltage is based on the battery bank, not the solar panels, so you need a 48V inverter. The number of solar panels in series depends on the charge controller. It will say the maximum voltage input. DO not use the "nominal volts" of 24V. Use the Voc listed on the panels, either around 38V for a 60 cell panel, or 44V for a 72 cell panel. You may only be able to do 3 in series.

@NAK940

6 жыл бұрын

Thanks for the clarification, we need to charge batteries in day time from panels and use in night. Solar panels must be calculated for both the loads during the day i.e. connected load and battery charging. The latest model solar inverters indicating built-in MPPT charge controller, so why a separate charge controller.

@AltEStore

6 жыл бұрын

I don't know of any battery inverters that have solar MPPT. You may have access to inverters I don't know about. Can you give an example?

@NAK940

6 жыл бұрын

a)SolarMax MPPT plus inverter, MakeSkyblue have built-in MPPT charge controllers, no idea of the quality. SolarMax MPPT plus inverter X-series 3K-24 [3000VA/2400W], its spec. indicates Battery & AC charger : 24VDC, charging current 20A Solar charger:Max PV array power 1500W, MPPT ragne @ operating volt 30-115VDC max charging current 60A Similar spec. of Solar and AC charge controller given for MakeSkyblue etc. Solar Panels having charge controller from Solbian see kzread.info/dash/bejne/em1-qLuTpMLFctI.html b) There is confusion in 2 or 3 days of autonomy or days without sun, whether these days are per week, per month or per year. if this value is taken as one, will my batteries store Ah which will be for 24 hours whenever there is no sun and for how much load, as we consider total combine load of day & night.

@AltEStore

6 жыл бұрын

a) Thanks for the info, I don't know that inverter/charger. Looks like the built in solar charge controller can only handle up to 60A, and it is for a 24V battery bank, so that's only about 1440W of solar it can handle. So a second external charge controller would also be needed. b) Days of autonomy tend to be back to back days, or at least very lose to each other. The idea is to make the battery bank big enough that it has energy energy stored if it doesn't get recharged the next day.