Hello,
I have two Multiplus 3000's in an RV split phase with 50amp shore power (two legs of 120v power in USA). The units are configured in split phase and are hooked up to a 12v lithium battery bank with 800 amp hours of power (8 batteries in parallel).
I am experiencing a weird issue, where one leg's input voltage from shore will drop down to ~100 volts and the other leg will increase to ~135 volts causing my surge protector to trip briefly then everything resets after 1-2 seconds and the cycle repeats. I've tested in multiple locations and this is occurring in multiple locations so i've ruled out the shore power actually being the issue (i think, open to suggestions but this has occurred in 10 locations. We also just replaced our surge guard transfer switch to check if that would fix or be the cause). The issue seems to occur extremely frequently (every 15 seconds) when running a 1500 watt or more load on either leg. We have tried both dynamic current limit and without and UPS function and without with no noticeable change. When the issue is occurring the units will switch from float to inverter and back in a fraction of a second I think because of unhealthy input voltage. We are running through the system checking for loose wires but don't expect to find anything but will double check.
Everything works fine on battery and when not connected to shore power.
I'm curious if anyone has ever seen this before and if it may be a firmware issue or a result of a split phase configuration issue? We are running the 430 firmware that came with the units and didn't want to upgrade without checking here first if anyone has seen this issue.
