I'm planning an installation similar to Wills 48v off-grid system, using EG4 6500EV's (two inverters, 4 batteries, etc.), and have questions about some of the connections. First, some background details:
Large and small loads are split up; smaller on the left and larger on the right.
Generac requires one transfer switch per breaker panel, operating in "parallel" mode.
The transfer switches provide service disconnects switches on the outside of the building. Breaker panels are inside the house.
For utility/standby operation, neutral-ground bonding is done at the transfer switch.
I'm not planning to sell any power back to the utility.
AC-IN will be connected to "Load Center 1" and looks, electrically, like any other 240v load on the grid.
AC-OUT will be connected to "Load Center 2" via the back feed breaker. This breaker will have a mechanical interlock with the main breaker.
Before installing the solar system, everything will work like a regular utility/standby system.
With solar working, the main breaker of Load Center 2 will be turned off and the back-feed breaker will be turned on.
It would nice to be able to easily switch between solar and utility/generator.
Now the questions:
1- The main breaker of Load Center 2 will switch off both hot legs of the utility. Is this good-enough to be considered off-grid, or do I also have to switch off the neutral leg? Same question about the ground wire.
2-Will's video recommends neutral-ground bonding at the breaker panel, but, the system is already bonded at the transfer switches. This probably depends on the answer to the first question; is the neutral-ground bonding at the transfer switch doing the same thing?
3- Is this how things are usually connected, or ???
Large and small loads are split up; smaller on the left and larger on the right.
Generac requires one transfer switch per breaker panel, operating in "parallel" mode.
The transfer switches provide service disconnects switches on the outside of the building. Breaker panels are inside the house.
For utility/standby operation, neutral-ground bonding is done at the transfer switch.
I'm not planning to sell any power back to the utility.
AC-IN will be connected to "Load Center 1" and looks, electrically, like any other 240v load on the grid.
AC-OUT will be connected to "Load Center 2" via the back feed breaker. This breaker will have a mechanical interlock with the main breaker.
Before installing the solar system, everything will work like a regular utility/standby system.
With solar working, the main breaker of Load Center 2 will be turned off and the back-feed breaker will be turned on.
It would nice to be able to easily switch between solar and utility/generator.
Now the questions:
1- The main breaker of Load Center 2 will switch off both hot legs of the utility. Is this good-enough to be considered off-grid, or do I also have to switch off the neutral leg? Same question about the ground wire.
2-Will's video recommends neutral-ground bonding at the breaker panel, but, the system is already bonded at the transfer switches. This probably depends on the answer to the first question; is the neutral-ground bonding at the transfer switch doing the same thing?
3- Is this how things are usually connected, or ???
