Solar Power Primer. Types of Solar Power Systems.

A solar electric system may be completely independent of the grid or designed to primarily feed power into the grid. It can also be a hybrid of the two:
OFF-THE-GRID
- Panels
- Mounting structure, unless building-integrated
- Combiner Box
- Cable to exterior disconnect
- Exterior disconnect for DC entering home
- DC Panel
- Charge controller
- Cable to Battery
- Disconnect for Battery
- Battery
- Battery interconnect cables
- Ventilated battery box
- Battery Meter
- Cable to inverter
- Inverter
At this point you have household AC, which is easily run to a standard household load center. Most systems also include:
- Back-up generator
- Exterior disconnect for generator
Sometimes things can be simplified, but as you can see, a stand-alone system takes more than just panels!
GRID-INTERTIE
Can be as simple as:
- Panels
- Mounting structure, unless building-integrated
- Inverter
GRID-INTERTIE W/ BATTERY
This system provides blackout protection. The required equipment is similar to an off-the-grid system although specific components will differ. A smaller, maintenance-free battery may be more appropriate, for example.
Both types of Grid-Intertie systems are designed to allow selling electricity to a utility company. Rates and policies vary by state. Utility approval is required. See recommended links for details.
Next page: How Big Does a System Need To Be?

