Installed Multiplus a week ago in a camper van (simple setup DC in, AC Out-1, GX 200 remote), tested at that time and had AC power supplied to 120V outlets. Just a few days ago, tested again, still had AC power in outlets, but after driving for 2 hrs AC output was no longer working. I checked the Multiplus - no LEDs come on when switching the unit on (not even then 'Inverter on' LED). When I flip the switch on the GX, the remote lights up briefly and I can use the knob to modify max current on the display; I also hear some kind of a relay clicking in the inverter when switch on the GX is flipped.
I unplugged the GX cable at the Multiplus and measured DC voltage supplied to the bolts/terminals on the inverter itself: 13.3V in 1st test, 14.2V after driving back home. I hope this is something simple that can be resolved without shipping the inverter back to the supplier. Can anyone suggest what can it be?
Here are some details of my setup:
3x 100Ah Battleborn lithium batteries, connected thru 4/0 cables + 300 Amp fuse on the positive to the inverter DC input. Have AC-1 out connected to a circuit breaker panel (50Amp breaker). I also connected wire to AC-In-1 for future charging from shore power (the other end of this cable is not connected to anything for now, with each conductor well insulated with tape). Have GX 200 connected with regular CAT6 cable. The inverter is installed horizontally on its left side (i.e. left side facing down); there is a cutout in the shelf so that the handle/vent on the left side of the inverter can suck in air.