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About a year ago I assembled a 12v 200ah battery with cells sourced from AliExpress and an Overkill Solar BMS. Trying to charge this battery using a bench power supply and getting a constant over-voltage alert. With no load and not charging, I get a voltage difference of 0.004v. When applying...

345 watts x 1.25 (suggested safety margin) ÷12 volts=35.9 amp charge controller then rounded up to 40 amps.

Just double checking my math.... I have 345 watts of Zamp solar panels. The size of the MPPT charge controller should be 40amps on a 12v system correct? If I use a 30a charge controller, it will function to charge a battery bank but this is where the bottleneck will be.

Eventhough I am a total newbie I figured this post may help others. If you order LiFePo4 cells, don't just assume the bus bars provided are correctly sized for your battery. Look up the ampacity charts!! My 200ah cells shipped with busbars that are sized for 50ah. Now I need to order copper bar...

I recently purchased a used Valence U24-12XP 110ah battery. The only way I had to try charging it is a Renogy 200 watt suitcase solar charger with a built in Voyager 20A PMW charge controller. Tried charging using this but it didn't work. It appears the cells are overly discharged so it needs to...