PV Gap

Michele Said:

How many people out their use solar and are off the grid or just have grid tie off systems?

We Answered:

Our system is grid-tied, and frankly, I don't know of anyone who had grid power who decided to disconnect after getting solar. The only people who seem to be off-grid are those who never had access to the grid in the first place (remote cabins).

As for batteries, there is a good forum on which to ask that question: http://www.wind-sun.com/ForumVB/index.ph… . Lead-acid AGM batteries are common.

Shawn Said:

which is more beneficial/ cost effective: solar grid-tied systems or off grid systems?

We Answered:

A grid tied solar system is the lower cost approach. There is no need for a battery storage system and/or a back up generator.

A stand alone (off grid) system has the advantage of operating even if the grid goes down but is more expensive.
A hybrid of these two systems is a stand alone system, with a two day battery storage, and a commercial battery charger. The PV panels charge the batteries. When the batteries get low the battery charger kicks in to recharge. Power from batteries goes to a couple of inverters and then to home circuit box. Better savings than a grid tied system and you have power even if the grid goes down.

Wanda Said:

How much would the installation cost for a solar grid tie system?

We Answered:

Installation costs vary from state to state. I would call some electricians and get a free estimate to do this work.

Here in Montana the average cost for installing a solar system on a residential home is approximately $7.50 per watt. There are also lots of grants to help offset this cost. A good resource for these grants is www.dsire.org

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