Solar_ice_caps
Member
- Location
- Florida
- Occupation
- Solar EPC
Designing a solar install with battery backup.
I will need to add a "System Controller" that will become the new Service Entrance.
That will effectively make the current Main panel a sub-panel.
I just got burned on this on the last job because we intercepted the service with a load center outside and so we had to upsize the wires that were going to the old panel because it became a sub-panel that was technically not handling all the loads of the house.
So my question here is, I'll be adding batteries that, while they provide power, also need to charge. Are they considered a load such that the old panel would no longer be "supplying the entire load associated with a one-family dwelling?"
Tangentially, I don't understand how the existence of loads elsewhere in the system makes a feeder of a given size able to handle more amperage.
I will need to add a "System Controller" that will become the new Service Entrance.
That will effectively make the current Main panel a sub-panel.
310.12 Single-Phase Dwelling Services and Feeders. For one-family dwellings and the individual dwelling units of two-family and multifamily dwellings, service and feeder conductors supplied by a single-phase, 120/240-volt system shall be permitted to be sized in accordance with 310.12(A) through (D).
(B) Feeders. For a feeder rated 100 amperes through 400 amperes, the feeder conductors supplying the entire load associated with a one-family dwelling, or the feeder conductors supplying the entire load associated with an individual dwelling unit in a two-family or multifamily dwelling, shall be permitted to have an ampacity not less than 83 percent of the feeder rating. If no adjustment or correction factors are required, Table 310.12 shall be permitted to be applied.
I just got burned on this on the last job because we intercepted the service with a load center outside and so we had to upsize the wires that were going to the old panel because it became a sub-panel that was technically not handling all the loads of the house.
So my question here is, I'll be adding batteries that, while they provide power, also need to charge. Are they considered a load such that the old panel would no longer be "supplying the entire load associated with a one-family dwelling?"
Tangentially, I don't understand how the existence of loads elsewhere in the system makes a feeder of a given size able to handle more amperage.