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Old 01-02-2010, 12:57 PM   #1
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using solar power to run ac products.


Has anyone using solar power ie, small panels to rune ac electrical appliances.

In particular electric heaters etc,.

Is enough power obtained by small solar panels to batteries to run these devices.

Do you need converters.

Will it be cheaper than running devices from the mains grid in order to reduce costs.

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Old 01-02-2010, 01:12 PM   #2
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using solar power to run ac products.


Check the wattage of the panels and the wattage of your device. You will find you need a very large panel to run even the most smallest device.

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Old 01-02-2010, 01:13 PM   #3
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using solar power to run ac products.


Yes you need a convert to take the solar panel DC power & convert to AC

A 200w panel runs about $400-600 depending upon quantity ordered & supplier

So to run a 1500w heater you would need 7 panels
Then they all need to be wired

There are DC underfloor heating matts
But they are expensive too
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Old 01-02-2010, 05:44 PM   #4
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using solar power to run ac products.


Energy derived from an off-grid solar installation will cost about 30 cents per KWHR. Smaller systems are more, larger ones are less. There are a lot of variables though.

The solar panels don't last forever, they lose about 2% of their capacity each year. Batteries need to be replaced on a regular basis as well. These two expenses are the largest.

Electric rates in Northern Nevada are about 12 cents per KWHR.

Rob
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Old 01-02-2010, 06:22 PM   #5
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using solar power to run ac products.


Your location's energy prices and the solar resource of that location determines whether it would be cheaper. More than likely it would be cheaper to power from the grid in the short term. Heaters use a lot of E, so you would need a few panels to supply the power needed. Electric heaters are pretty wasteful - you may consider a more efficient way to heat your living space and then power that with solar.
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Old 01-02-2010, 06:27 PM   #6
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using solar power to run ac products.


Quote:
Originally Posted by rescrewableE View Post
Your location's energy prices and the solar resource of that location determines whether it would be cheaper.
Assuming 100% efficiency, 1 Therm of energy can be had from approx. 0.71 gal of fuel oil, 100 cubic feet of natural gas, 1.1 gal of propane, 29 kwh of elec heat, 8.4 kwh of heat pump heat (COP = 3.5), 4.2 kwh of heat pump heat (COP = 6.9).

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