The Solar Electric Plan
Usually there are two or three drawings the Building Department will ask for when you
submit your plans.
First, they will need a Schematic of the System Design with a description of all the components
including model and capacity. This diagram should include how the AC and DC are grounded, the wiring and disconnect(s) rating and size (with calculations perhaps) and, perhaps(for larger systems), how to remotely access performance meter data recording.
Second, they will want the Elevation(s) to show where the components are on the exterior
of the building and how they can be accessed, including the inverter, the main panel, the meter(s), the disconnects, and how they are weatherproofed. The size and type of wiring and conduits may also be required, with the distances between connections noted. Some Fire Departments require a DC disconnect of the PV Array to be accessible from the first floor exterior.
A separate Electric Floorplan with any interior components of the system might also be required.
If there is a battery backup system involved, the battery bank's location, access, venting, and capacity(including the total number of batteries, their voltage , and their configuration) will need to be described. The systems backup inverter (if separate from the grid tie inverter) with its location, capacity and the expected hours it will provide power for critical loads plus the location and size of the critical subpanel and a description of the circuits it feeds must be included as well.
Copies of the application form and other documents will likely be part of the building permit requirements. There
has recently been an attempt by the CPUC and CEC to simplify the application process, but it still needs improvement.
Try the CSI Power Clerk website for the latest information.
Solar Electric Plan Example
Components of a 5kW Utility Interface System
- 30-200 Watt Solar Panels (3 strings of 10)
- 10-Roof Track Mounting Systems
- 1-Combiner Box and High Voltage DC Disconnect
- 2-2500 Watt Inverters
- 1-System Performance Meter (Required by CPUC if Performance Based System)
- 1-Utility Disconnect(if rqd)
- 1-Main Service Panel (if new construction)
This System will produce 25kWh per day based on 5 hours of sun
and 774kWh per month.
This Utility Grid Tie Interface System would cost about $37,000 installed. With a 30% Federal Tax Credit of
$2000.00 and a CEC Incentive of $12,500.00 the final cost would be about $23,500.00. The yearly savings in
your electric bill would be around $1500.00
South Elevation of a Residence with 30 Degree Roof Pitch.
Grid Tie System Schematic
For more information call (707) 462-2427 or E-mail Collins By Design
Cal Contractors Lic #B557124
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