-I have a 200 amp 240V single phase service.
-I have and existing 100amp sub panel in a remote location feed by #4 copper
-I'm trying to figure out how to how to back feed 60amps of solar that is near the sub panel without installing a new conduit back to the service for a line side tap.
Any ideas?
Thx
You may have options, but there are conditions...
Option 1: Do load calculations for the subpanel to determine if it the breaker feeding it can be replaced with a 60amp breaker. If yes, you may install the 60amp solar breaker in the subpanel, at the opposite end of the busbars from which they are fed, with a label not to move the solar breaker. (If you can downsize the breaker feeding the subpanel to 40amps, the location of the solar breaker in the subpanel does not matter.)
Option 2: Do load calcuations on the whole house to see if the main breaker can be downsized to 175amps. (You may also need to verify that you can do this in the main panel without violating its listing.) If yes, you may install the 60amp solar breaker in the main panel, at the opposite end of the busbars from which they are fed, with a label not to move the solar breaker. (If you can downsize the main breaker to less than 140amps, the location of the solar breaker in the mainpanel does not matter.)
Option 3: Line-side tap. As you can see, options 1 and 2 are tall orders, especially option 2.
BTW, I agree with the conclusions gar and sierra have reached, i just thought I'd lay out the practical options.