First battery build 7S 30P 24v 75ah 210 cells

[Bart]

This is my first battery build came out pretty good but I'm pulling it apart to rebuild it, as I was hoping to make it 100ah, I 3D printed a cover plate to install a 100amp shout and display, Installed 100 amp continuous Daly BMS.

 

[Wolf]

100Ah on a 7s 30p will require 3200mAh cells. or 2600mAh cells if you go 40p.
What are you going to power with this battery?
Wolf

 

[Bart]

100Ah on a 7s 30p will require 3200mAh cells. or 2600mAh cells if you go 40p.
What are you going to power with this battery?
Wolf

I purchased a cargo trailer and I’m converting that into a camper so next year when I’m building my cabin I have somewhere to sleep and keep my stuff, I bought 4 100w solar panels, 1500w 24v inverter, solar charge controller, I got a step down 24v to 12v to run lights, fan and small 12v tv, so this battery will be hooked up to that system is exceeds my needs but I wanted to make sure I still have a little comfort. This system will also charge my Dewalt batteries for my tools.

 

[Bart]

I'm just doing all this to learn so when I build my power wall for my cabin I'm planning to put in 5000 W of solar and 20,000 W hours of battery.

 

[OffGridInTheCity]

I'm just doing all this to learn so when I build my power wall for my cabin I'm planning to put in 5000 W of solar and 20,000 W hours of battery.

I like these numbers. I run 12.85kw -> 81kwh battery and I average 40% DOD for a year consuming all the power I create. By extrapolation, 5kw PV -> 20kwh battery would put you around 62% DOD - which is a perfectly reasonable design. Assuming you're 'off-grid', there may be a handful of days where you can't consume all the power you generate thru the PV because the battery is not big enough to hold it relative to your consumption pattern - but you'll discover that over time. My suggestion is just leave room (if you can) to increase the size of battery bank over time

 

[Bart]

I like these numbers. I run 12.85kw -> 81kwh battery and I average 40% DOD for a year consuming all the power I create. By extrapolation, 5kw PV -> 20kwh battery would put you around 62% DOD - which is a perfectly reasonable design. Assuming you're 'off-grid', there may be a handful of days where you can't consume all the power you generate thru the PV because the battery is not big enough to hold it relative to your consumption pattern - but you'll discover that over time. My suggestion is just leave room (if you can) to increase the size of battery bank over time

I have 24 acres of land in North Iowa, and yes it will be off grid. The first thing I'm going to build is a utility shed with the power systems batteries set up prior to building the cabin, Once I feel confident in building the small system for my cargo trailer, I previously built a 12v 4s 15p power supplies and it works great

 

[Bart]

I just had these delivered this week 280 of these batteries which I'm cycling and testing right now I'm going to Build 2 7s 20p Batteries with them and connect them in parallel.