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Using Solar to supplement and Off grid Generator

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Posted by philkryder on May 26, 2007, 12:35 am

Colleagues -
We currently run off grid with an 8kw generator with 13500 surge.

We estimate our average usage at about 4kw.
For f hours
on 3 days per week - Wednesday, Saturday, Sunday.

We operate from about 9am to 4 pm.

We spend around $000 per year on fuel.

I was wondering if SOLAR makes sense as a fuel cost mitigator.

Can we use our generator to handle surge load and dark days and have
the SOLAR act as a load reducer.

Will the SOLAR inverter match the generator as it would match the


Posted by Eeyore on May 26, 2007, 3:34 am

philkryder wrote:

PV solar makes no sense for anything at present costs and efficiencies.


Posted by philkryder on May 26, 2007, 6:09 am


Graham -
Thanks for weighing in with your opinion.

Do you feel that is true even for off grid locations at current and
future projected fuel costs with say 10% annual compounded increases?
What level of projected fuel costs would you see as a break even

If you have some easy to follow data and analysis, it would be very
helpful and save us from wasting time.

I felt originally that have 7 days to gather power, but only 3 days
consumption might help us - If we had batteries. But, batteries have
their own downsides....

Again, thanks for joining in.
I'd really appreciate and data and analysis you could provide to help
show your conclusion.


Posted by Charles Foot on May 26, 2007, 10:18 pm

Eeyore wrote:

Hmmmm.... horses for courses really. Here on Great Barrier Island, where
there is no power grid, and diesel is so costly, PV makes a lot of
sense. I've just boosted our solar array by 1200 watts worth. Compared
to the cost of generating our power with diesel, I see a financial
payback within about 4 years (including framing, wiring, bigger charge
controller, etc.) And, the saving on the environment: priceless.

Posted by philkryder on June 9, 2007, 4:18 pm

how much does diesel cost there?

What was your total cost for the 1200watts?

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