Interlock kit

Question

I rewired my trailer with a square box, two fuses have incoming power. On from shore power and one from the inverter.
I can not figure it out but each hot fuse only powers certain load fuses (no I don’t keep them on at the same time or even have power running through shore/inverter at the same time). For example, inverter power will run most lights, outlets, and fridge outlet but not the ac (fan low only) and one set of outlets. The shore power will run the AC and the other set of outlets but every else doesn’t work.
I know it’s the wiring or order of the square d blocks. If I run the shore power cord to the inverters outlet the same thing happens as if it is actual shore power.

If I move the breakers to different spots in the box I get similar but a different combination of results.

I’m assuming that there might be an order I need to set the fuses in but I can’t find anything online saying what that is. It’s only 6 breakers anyway, two power and 4 load, so it’s not like there are an unmanageable number of combinations.

Ideas?

dutch_12078 · Answer

It seems you're trying to use a 220 volt service panel with two independent 120 volt sources. Each source can only power the breakers on it's own bus. If the inverter is on full time, then place only the breakers you want powered by the inverter on that bus, with the others on the shorepower bus.

mrwizard · Answer

Either use a sub panel for the circuits you want to power from the inverter, or use the OEM panel and put a transfer switch between shore and inverter supplies, and manually turn off the AC and other breakers when you are using inverter power, this second option is what I have done ,

If you are using a house 220v breaker panel , and supplying it from both the shore line and the inverter , that is a dangerous situation, and against electrical code, you have two different not in sync electrical supplies sharing neutral, accidentally having both supplies energized could result in damage to the inverter and possibly fire or other electrical damage to the RV

nickthehunter · Answer

You should probably not be messing with electrical panels, you seem to lack the basic understanding of how they work/supposed to work.

opnspaces · Answer

Considered many different replies. But I'll just say read MrWizard's post above, and then read it again.

kd4upl · Answer

Breaker panels have two buss bars. They aren't connected. The are normally for L1 and L2 used with a 240v/120v 50 amp service. You seem to have 2 120 volt inputs: shore and inverter. You need a transfer switch.

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