Summary:

• This is a work in progress.
• This is a solar design based on Enphase Gen 4.

Service:

• 400A service split into two separate 200A lines feeding two separate breaker boxes.
• Load panel #1 200A rated Bus w/150A main breaker
• Load panel #2 150A rated Bus w/150A main breaker
• Load calcs on both boxes are complete.

Equipment:

• Solar Panels: BlueSun BSM550M10-72HBD
• Microinverters: Enphase IQ8HC (240v / 1.6A)
• Combiner Box: Enphase IQ Combiner 6C
• Meter Collar: Enphase Meter Collar (Gen 4)
• Battery: IQ-10C
• UPDATED Load Panels: TBD 225A Bus
• Breakers:
  • Main - 150A (both)
  • Solar Backfeed - 100A (array 1) + 125A (array 2)

Solar arrays:

1. 30 panels producing 48A continuous
2. 32 panels producing 51.2A continuous

• Each Enphase system consists of microinverters (IQ8HC) on each panel, a Combiner Box 6C, and a Meter Collar which creates a microgrid when the grid is down. The Meter Collar is rated 200A.
• Power from each array passed through a separate Enphase Combiner Box 6C before terminating in each breaker box.
• Array 1 will feed UPDATED breaker box 1 (225A w/150A main breaker)
• Array 2 will feed UPDATED breaker box 2 (225A w/150A main breaker)
• Each system will have 1 Enphase 10C battery (but I want room to upgrade to two batteries on each system).

Please see the One Line Diagrams, and the system specs for more detail on the proposed equipment.

TO DO:

1. Determine if we need to separate critical loads from the main service panel(s), or if moving large loads to combiner box load shed breaker (80a). Can each solar system support the entire load from its attached main load panel?

2. Sign the electrical drawings in Massachusetts

DONE:

1. Determine the required capacity of each of the main load panels (amp capacity) to support the additional back feed from solar / batteries (in other words, what is the minimum bus rating for the load panel given the current load and the new solar backfeed).

2. Determine the breaker sizes needed for the solar backfeed from combiner box to each of the breaker boxes (which will have to support the solar from one array plus the battery(ies) passing from the combiner 6c.

3. Will this configuration (main load panels, plus solar / battery) meet NEC standards?