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MultiPlus 12/3000/120-50 overload and invert

Two multiplus 12/300/120 inverters running side by side from a 50 amp US service. One leg of service goes to inverter 1 the other leg to inverter 2. Every 2-5 minutes inverter 1 shows “inverting“ and “overload“. Constant load on inverter is about 800 watts. Doesn’t really change when load varies up to 1700 watts. Inverter appears to be trying to boost. This has been occurring since startup- around a year. Does not see to occur when not connected to shore power
Dealer says it’s a wiring problem. And offers no further suggestions. All connections have been tested for tightness, given wiggle test (grab cables and pull) and tightened. This occurs across dozens of sources. We travel roughly every two weeks, using different supply sources, so it’s not a supply issue. All 12v wiring is 4/0 and shows no heat or connection issues. This seems like an issue with the inverter but I don’t know how to test further or get assistance.
Have video of install and the rattling sound when this occurs.

MultiPlus Quattro Inverter Charger
5 comments
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Couild you please upload some pictures and a FULL wiring diagram of how its all setup. Inc the VE Config settings. and what fw versions for the two units. also have you go a Venus device attached and are you connected to the Victron VRM

Venus device is in use. Connected to Victron VRM. All units show current software version as of today.
do not have a current wiring diagram

Is there more info I can offer to have someone comment with suggestions?

1 Answer
ed1380 avatar image
ed1380 answered ·

have you tried swapping the inverters.

if the problem moves - inverter problem

if the problem stays - supply/wiring/load issue

does the problem persist even with no load on the inverters?

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