As the title suggests I am not seeing full DC charging output from parallel multiplus 2's. I have 2 MP2 24-3000-70-50 2x120 in parallel. Ac input feeds from the ac in junction box are the same size and length, as are the ac output leads to the junction box. Both ac in and out are 12/4, the manual is very clear about not oversizing the ac wiring for the purpose of balancing between the 2 multi's. I have checked and the multi's are within less than .5 amps of each other under various load conditions. The DC side is fed from a lynx distributor with same size and length wire going to both units. (0000 wire connects 400ah lifepo4 battery bank to the lynx, and 0 connects each inverter to the lynx. Initially each inverter was connected to the lynx with 2guage and I thought to try different size when I wasn't seeing full DC output but no change) everything is connected to a cerbo and I also have a smart shunt. I am only seeing 120 amps combined from the inverters in bulk. I have confirmed that each inverter will put out the full 70 amps in stand alone. The battery bank can take 1c charging (the full 400). If I start the RV and the alternator starts to supplement the inverter charging the batteries will take way over 140 so I don't believe it is a limitation anywhere in the system. DVCC is enabled but these are self managed batteries so no bms connected to cerbo and only shared voltage and current are enabled in DVCC. Max charge current is set to 250.
Unfortunately my clamp meter only reads ac amps and not DC so I can't tell if both inverters are throttled back equally on charging or not. Oh and the firmware is 497. Any ideas? Or is this one of those "it is what it is" situations? Same behavior on shore power and generator.
