Watt 12 Way
Watt 12 Way
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How long can a 12 volt battery light a 40 watt florescent bulb for?
I was also hoping to know if 12 volt battery's can be reused. In addition, I was hoping to find out whether or not there is a way to light a 40 watt florescent bulb using BOTH a 12 volt battery and a small reasonably priced solar panel for under 30$? Could the panel be used to recharge the battery?
I'm doing this for a school project where we construct a garden of some sort so I'm constructing a hybrid between an indoor and outdoor garden... I will allow natural wind flow and water it myself but in addidtion to the sun I wanted to add a lighting fixture WITHOUT using power from a house or power lines, so i figured i'd try a battery (12v) which type of 12v im not sure of, its for plants so im assuming NOT a car type of battery to power a 40watt florescent bulb and connecting it with copper wire. I was thinking of using a battery like this: http://www.radioshack.com/product/index.jsp?productId=3740316 but i don't know if it's the correct battery
The battery in your link would not run a 40W lamp, as it could not supply enough current. Also it is not rechargeable, so it would be thrown away once empty, assuming it could be used. With a 40W lamp, running from 12V (assume you have a 12V lamp) the current is 40W/12V = 3.33Amps. A car battery (the smaller kind) might run this for approaching 12 hours. It would have a longer life if it was only run for about 6 hours, so a bigger battery would be better. It would then need recharging. If it is charged from a wall outlet it needs about 1.4 time the energy taken from it to recharge it, so it is actually better for the environment to run the lamp directly from the wall outlet.
You could recharge it using solar panels but would need quite a large and expensive array of them. It needs maybe 100 ampere hours a day to recharge the battery and run the lamp. If there is the equivalent of 5 full sun hours a day (depends where you live), that needs 20 Amps of panels or more, so two of the largest 12V x 12A panels would do it. There needs to be a charge controller too. This would be too expensive for your needs I expect.
Note that the compact fluorescent type of lamp is about 5 times more efficient than an incandescent lamp, so an 8 or 10W version is the equivalent of a 40 W bulb. You can obtain these to run directly from 12V also. This may use about 1 Amp at 12V, and would reduce the size of the panels needed so that 24Ah a day are needed for continuous operation. The panels have to provide this and a little more with 5 full sun hours a day (if your area is that good), so the panels would need to be 12V @ 6A. It still needs a charge controller and is still relatively expensive.
Hope this helps.