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The capacitors in the battery? I have never done that before. The inverter was one that was recently connected and turned off, so would the capacitors in the inverter already be charged?

The fuses are all good. When I took the battery off the system and checked it again, it was at 4.1V? which was a surprise. It may have been a battery voltage problem all along. I did not check it before I put it on the system. I put the two SLA batteries back on and everything is working...

tried it a few times, no joy. Is there a way to reset the MT50 and charger controller?

thanks, I was able to change the temperature compensation coefficient, but could not change anything after that. I was holding down on OK and the cursor would not highlight. It is not a battle born battery, but an expert power.

I do not have a BMS, is that a requirement for LiFePo? The battery as listed on Amazon has an internal one.

I have a 400w solar panel array that was feeding two lead acid, 12 V 100 amp hour batteries in parallel through this charger controller: EPEVER MPPT Charge Controller 40A 12V/24V Upgrade Tracer4210AN + Remote Meter MT50 Monitor + RTS for Solar Panel Charge Controller Regulator with LCD The...