Hello,
We are installing a home battery backup system in combination with a solar array. This particular house is small with very few electrical loads.
Normally we would seperate out circuits from the main panel and create a "backup loads panel" but in this case we are putting the unit right in-between the service conductors and backing up the whole house.
Here are the details: House is fed by 4/0 AL from a 200 amp breaker at a mer/main in the road. The 4/0 lands in 200 amp main panel on 200 amp man breaker. 200 amps is beyond overkill for this house.
The backup unit is limited to 60 amps output (there is a 60 amp breaker installed) even in normal pass thru mode while grid is up. So our plan is to cut the 4/0 feeders, splice them down to 6AWG in a box, land in the unit, come out of the unit with 6AWG, splice back onto 4/0 feeders that feed the panel.
This seems strange but it is all protected by the 60 amp breaker.
I am wondering if the ground wire has to remain the same size as it is with the 4/0 feeder or if it can be sliced down to #10 in the same box because it is now protected by a 60 amp breaker?
We are installing a home battery backup system in combination with a solar array. This particular house is small with very few electrical loads.
Normally we would seperate out circuits from the main panel and create a "backup loads panel" but in this case we are putting the unit right in-between the service conductors and backing up the whole house.
Here are the details: House is fed by 4/0 AL from a 200 amp breaker at a mer/main in the road. The 4/0 lands in 200 amp main panel on 200 amp man breaker. 200 amps is beyond overkill for this house.
The backup unit is limited to 60 amps output (there is a 60 amp breaker installed) even in normal pass thru mode while grid is up. So our plan is to cut the 4/0 feeders, splice them down to 6AWG in a box, land in the unit, come out of the unit with 6AWG, splice back onto 4/0 feeders that feed the panel.
This seems strange but it is all protected by the 60 amp breaker.
I am wondering if the ground wire has to remain the same size as it is with the 4/0 feeder or if it can be sliced down to #10 in the same box because it is now protected by a 60 amp breaker?