100amp MPPT Solar Controller, 100V Input, LiFePO4 (Lead Acid AGM) Lithium Battery, Maximum Input Voltage 100V, Power 1300W / 2600w (12V / 24V), Automatic Identification (k100a)

Worked really well forc10 months. I checked my sealed led acid batteries, I have 4 6 volt deep cycle batteries wired to be 1 24 volt battery. I have 2 on reserve, charging in case of failure. These batteries were added to my system at the same time as the controller. I checked the system with my voltmeter randomly throughout the 10 months. Prior to this I had 4 led acid deep cycle 6 volts. Tgey also were stiill in good shape but not running on my system. About 2 months ago I noticed my intake from my panels reduced by half at the charge controller. I checked the output to the batteries and it was producing half the input. Two of the vatteries were showing a 3 volt charge only. I immediately removed these two and swapped out the fully charged reserve 2. I tgen placed the lower charged 3 volt batteries on the smaller system. The next 2 months I checked tge syestem 3- 4 times a day and ststedy watched thus cintroller destroy the 400.00 a piece batteries. By the time I gave up, the controller was registering my 24 volt battery bank as a 12 volt bank. A knowledgable friend who reccomended this controllertolf me I had faulty batteries. I knew this was untrue because the two I swapped out were currently at full capacity again. I dismantled the 24 volt bank and added all batteries in series/parallel to tge smaller 12v system that I use for stand by. All four batteries are back to full charge. I’d love to get tech. on all this but a significant current drop from the input of a conponent to the out put of that component. Common sense says it’s a failure with that conponent. Not the prior conponent or the one after that conponent. Btw: my cheap matanence charge controller was 29.99, cheap 100amp mppt knok off. So getting what I pay fir in this situation is not the case. Crap is crap.