I am looking for a proper wiring diagram for the following scenario.
Shore Power 240 spit phase entering dual 3000 12 v multiplus inverters in parallel.
I would like the power to pass through the inverters normally on shore power, however if using the inverters i would like to add a 100 amp autotransformer to balance the loads exiting the inverters before entering the distribution panel.
Is this possible?
if so what would the wiring exiting the inverters to entering the autotransformer look like?
I don’t have an elegant answer for you other than using an external three pole, double throw switch. But if I may, why? What are you trying to achieve? Are you concerned that incoming shore power would have 120V loads that are so unbalanced between the legs that the AT would overheat?
We routinely use an AT with dual inverters configured in split-phase (not parallel) mode that are connected to shore power or external generator.
my apologies, i believe i described my set up poorly
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I have a 50 amp split phase rv . it has dual 3000 multiplus inverters.
the inverter s are configured together. each inverter has an L1, neutral , and ground entering and exiting the inverter.
upon exiting the inverters the both neutrals, both grounds. and each l1 enter a breaker box before entering the distribution panel.
i want to add an autotransformer to balance the two l1 lines exiting the inverters, so that i can utilize the unused potential of the inverter on the opposite l1 as the one the appliance is using, but work normally when on shore power.
No worries. I understand. To use the AT you need to reconfigure your inverters from parallel operation to split-phase. In other words, L1 would go to one inverter and L2 would go to the other. The wiring diagram you seek is in the AT manual. I’ve snipped it out of page 3 for you here:
L1 exiting the AT would go to one side of your RV load center and L2 would go to the second side of your load center. The AT would then balance loads across the two inverters up to a 28A difference.
This is our solar trailer that we also use for demos and on-site trainings. It has a 50A shore power input. The inverters are configured in split phase and the AT balances 120V loads evenly across the inverters. This is the configuration you should choose with your existing inverters assuming they are the regular 120V inverters and not the 2x-120V inverters.
If you are using two 2x-120 inverters in parallel then an AT isn’t going to do anything for you anyway. If the inverters are in parallel mode, they will balance themselves.
This might be a case where you would want to consult with a local trained Victron installer, especially if you aren’t clear on the difference between a parallel inverter setup vs split-phase.
