On-Grid

An “on-grid” or “grid-connected” system means that you are connected to the electricity grid provided by the local utility (in Arizona, usually SRP, APS, TEP, or other)

How does an On-Grid system work? The figure below shows a typical configuration:

The PV module converts the sun’s rays to DC (direct current) electricity which is then converted to AC (alternating current) electricity by the inverter.

The inverter feeds the utility grade electricity to your main panel which feeds your house.

If you are consuming more than the solar array is producing, power is drawn seamlessly from the utility. If the solar array is producing more than is being consumed then the excess electricity is fed back to the utility and you are credited for it. (see Net metering – Solar FAQ’s).

Does Solar make sense for me? The answer is yes if:

1) you are concerned about energy dependence
2) you want to see emissions of greenhouse gases reduced
3) you want to save money and hedge against future energy costs

What do I need to consider to “go solar”?

1) Orientation of the house and roof areas
A South-facing roof or ground area is ideal. (insert flush mount pic)

North, East or West oriented roofs can also be accommodated through different kinds of mounts. (insert fish gill pics)

Ground mounting of solar arrays are also an option where space is available and conditions permit.

2) Unobstructed sun – no shade from trees, neighbor’s houses or trees or structural elements on your roof.
3) Approx. 100 ft2 (flush mount) to 150 ft2 (low profile) of space for every 1000 watts of installed – a typical 3000 watt array would require between 300 to 450ft2
4) Ample space in your main electrical panel (usually a double pole 20 amp circuit breaker for a typical system); larger systems may require a panel upgrade from 200 amp to 400 amp.
5) Roof type – asphalt shingle, red clay tile, cement tile? Roof pitch – flat with parapets, pitched? Solar can be mounted on virtually any kind of roof and any pitch and new tile replacement solar panels offer additional options in some cases.

What else should I consider?

Your solar system can be removed for roof repair if necessary, but it is more cost effective to perform reroofing or roof repairs before the solar installation.