I would like to know if one of these 45 w. systems would run a small electric heater to heat a small greenhouse over night. It is a GE heater, 120 volts, 60 Hz., watts input 1500. If this sounds like I know very little about electricity, you are right.

Thanks, Jean

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Comment by Russ Ault on December 17, 2010 at 8:50pm

Ok, you want to know if you can run a 1500watt, 120vac heater, with a 45 watt 15volt DC solar panel, short answer, NO.

This is what you can do...get a 12volt deep cycle battery and a 1500 inverter, connect the inverter to the battery , plug the heater into the inverter and use the solar panels to charge the battery.

However, keep this mind,  power use and power generation is not only a function of watts, it is also a function of time that is measured in kilowatt hours.

If you use 1500 watts for 1  hour that is 1.5 kilowatt hours that you are draining out of your battery.

Your solar panel generates 45 watts, so in 1 hour you would have charged your battery up with .045 kilowatt hours.

So it will take 33.33333 hours to charge the battery up enough to use the heater for 1 hour.

 

Comment by Russ Ault on December 17, 2010 at 9:07pm

I don't now how big or how your green house is setup, but if you are looking for a way to maintain the temperature in your geenhouse over night, a better and cheaper way would be to use water.

If your green house is big enough to hould 55 gallon drums put them in a row, put you planting flats on top of them.

During the day, the sun will heat the water in the drums, at night the drums will slowly give off the heat.

Or you can use what ever size container that will fit in your greenhouse, same principle.

 

Comment by Bill K on December 24, 2010 at 2:56am
Google 12 volt heaters, those used often by long haul truckers, that they plug into their cigerette lighters, that would be the easiest and most efficient way to heat the green house....with a couple of deep cycle batteries, and lots of sun in the day time, you might pull it off...but you'd be wise to have a regular 120v thermostatically controlled heater as a backup, in the event the batteries die earlier then you expected, that way not frosting the plants in the greenhouse....my 2 cents...
Comment by Shirley Billingsley on February 11, 2011 at 7:58am
To run heat and air, you will need to have 80 watts of power, instead of just the 45. You could however combine the 45 with more solar panels, which would then give you enough watts to run the small electric heater.

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