So I decided to build my own 200 amp LiFePo4 battery for my van

[Deryk_the_Gypsy]

well when I left this morning, battery was at 13.18 volts. 120 miles later it's at 13.34 volts... so I guess it's taking a charge. Tuesday I head back and hopefully it should nearly top it off.

 

[snoobler]

There is very little voltage rise over most of the charge range, so that may be fine. Can you take a screenshot of the app the next time it's charging?

Does the BMS show that you're charging and taking on Ah?

 

[Deryk_the_Gypsy]

I can drag my tablet outside when it warms up a bit (I am up in the mountains) I went outside, opened the app and it shows battery at 13.33v 200 amps and at 100% Overkill wants me to "measure voltage across the BMS, with the engine running and charger active. (measure B- to C- )" going to be difficult where I have the battery mostly below the floor but the bms is showing the right voltage on the battery why would i need to measure the voltage across the bms?