Will it work? Sol-Ark 12k w/ bypass switch

The intent here is to use transfer switch in the event of grid failure to power main panel through the load side of the Sol-Ark 12k from battery/PV... normal grid-tied operation otherwise.

Homeowner is aware they will have to manually shed loads in the main panel before activating bypass switch. Space in closet where MSP is located is limited so they don't want PLP.

Found a diagram for the 15k with a SLD like this one, but not for the 12k. Think it will work?

Rough SLD attached.

That set up would work on most any inverter. As long as the Bypass Switch has an open transition there is no possibility of creating a current loop between the Output and Input of the inverter.

I think the only issue you'll run into is the fact that the 12k only has a 63A passthrough, not 200A.

So you may want to look into that a little more.

fmemon said:

I think the only issue you'll run into is the fact that the 12k only has a 63A passthrough, not 200A.

Click to expand...

Not an issue since the Main Panel is fed directly from the grid in normal operations. 12k manually takes over when the grid is down, so passthrough is not an issue.

In the proposed configuration, the "transfer switch" could be a main panel isolation device, where the 12k comes into the main panel. The isolation device prevents the main breaker and top breaker from both being "on" at the same time.

DIYrich said:

Not an issue since the Main Panel is fed directly from the grid in normal operations. 12k manually takes over when the grid is down, so passthrough is not an issue.

In the proposed configuration, the "transfer switch" could be a main panel isolation device, where the 12k comes into the main panel. The isolation device prevents the main breaker and top breaker from both being "on" at the same time.

Click to expand...

I have a 12K and find it to be easy to stay within 63A limit when the grid is down.
If the grid went down when the oven and dryer were running and the air conditioner tried to start, the 63A load breaker might pop.
You might be able to get another 50A using the GEN breaker as smart load. I haven't tried that. As far as I know, the smart load is never fed to the main breaker box.

ArthurEld said:

I have a 12K and find it to be easy to stay within 63A limit when the grid is down.
If the grid went down when the oven and dryer were running and the air conditioner tried to start, the 63A load breaker might pop.

Click to expand...

Grid down, the most the 12k can put out is 50 amps.

ArthurEld said:

You might be able to get another 50A using the GEN breaker as smart load. I haven't tried that. As far as I know, the smart load is never fed to the main breaker box.

Click to expand...

63 amp limit is Grid Line. doesn't seem like the 12k can add 50 amps to that and send 63 amps to the load, and another 50 amps to the Smart Load.