# How To Size Your Off Grid Battery Bank Capacity For Solar – Math Warning!

Properly sizing a battery bank is like black magic. Very few people really understand how to do the math.

So how do I know how many batteries I need? There is a lot that goes into that so this video starts to answer that question with the first step: calculating the total capacity of the battery bank you will need.

In the future, we will get into choosing from different types of batteries to Tesla Powerwalls to how to get the most longevity out of your system. Stay tuned for that!

### 19 Comments on “How To Size Your Off Grid Battery Bank Capacity For Solar – Math Warning!”

1. Duraikannan Sakthivel says:

i have one 850va solar inverter with 160+160 solar pv panel.

I can connected one more set same size solar inverter (same manufature) in barallel connection

For increase the load capacity to single outlet

2. Neil Mavin says:

3. m mcc says:

i am new to this subject…just wondering….how many batteries is that?

4. Nyght myst says:

that helped thanks

5. Hari prasanth says:

So how many batteries you need for 772 amp hours

6. Kenz300 x says:

Wind and solar energy are now safer, cleaner and cheaper than fossil fuels and nuclear energy.
Battery storage is a game changer making wind and solar base load power.
Clean energy production with solar panels / tiles and battery storage.
Clean energy consumption with electric vehicles.  No emissions.
A new solar roof, battery storage, an electric car charger and an electric vehicle.
Solar panels are now being projected to have a much longer life than just a few years ago.
Electric cars, electric trucks, electric lawn mowers, electric snow blowers, electric tools, no emissions.

7. Pop's Shack says:

I'm starting to lean towards the theory that you should really only need enough battery storage to get you from sundown to sunup.

8. woodworks1423 says:

Could you take this same example and go through the battery capacity and solar panels, ball park,  you would get for these numbers?

9. اسلام الوعي says:

stupid vid u should name it load calculation!!!

10. Ch Sukhee says:

so you traveled in Mongolia. Why are you putting in your video Mongolian Yorts?

11. duannguyen says:

One mistake is not to add the wattage of inverter. It also cost power to run it and sometimes it could be quite a bit of extra power to run all day.

12. soumare oumar says:

Hi
Thanks for the information. Very interesting. I have an incubator of 170w , 230v , 50Hz. I want to use it for 28 days consecutively. Please can you calculate for me the solar panels, the batteries and controller should I use?

13. Chris Mills says:

I'm assuming this is for a 110v system what would you have to change if anything for a 240v system thanks

14. Nyght myst says:

Dude I am soooo glad I found this it helped me I am adding it to my watch later list so I keep thanks a lots got what I been looking for

15. Jerry Lifsey says:

I calculated that for my home to use 100% battery use for a year, I'd have to fill every cubic foot of my home with lead acid batteries or I'd need two homes…one home to live in and another home to fill with lead acid batteries.

16. Sebastien L says:

You can also look at your electricity bill

17. Deepak Jindal says:

I am going to purchase 250 watt poly 24 v and 24 v batteries, so Should I calculate amp hours using 12 volts or 24 volts?

18. James stranger says:

my problem is I have a 5 kW inverter. and a 200 ah 24v lead acid battery bank. for a off grid home. no solar yet. and have to run the generator every time I turn around. it sucks running the gen so much. trying to save funds to buy more batteries and panels. I am not picky about battery chemistry. I just bought what I could afford. great video