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jll0306

VERY small scale solar lighting system

18 years ago

We have a small woodstove which could serve for heating and cooking in the event of power outage, but it would be nice to have electric lights for a while at night. I'm trying to design a very simple solar system, which chargs a small battery during the day that I bring in to power a 12v. light at night.

I have the following components but I have not hooked everything up yet.

One 15 w. solar panel,

One UB1250 12v, 5 ah sealed led-acid battery

One 12 v., 15 amp solar charge controller

One 12 v., 9 watt Coleman work light

My hub thinks this is a great plan, but he is math/techno phobic, so he can't help. Am I on the right track here or should I back up and start again?

Assumption 1. 5-6 hours of sunlight will be sufficient for initial battery charging (6 x 15 = 75 w)

Assumption 2 Use of the solar charge controller between the panel and the battery will protect the battery from overcharging.

Assumption 3. I do not want to discharge my battery deeper than 50% at any sitting. Therefore, I should plan on using the light only 3 hours a night.

If those assumptions are correct, I have three questions:

1.How much power loss can I expect in a 12 volt system?

2. Where can I find a 12v. socket to connect to the battery?

3. Is the sealed lead acid battery the best choice?

thank you for any help you might be able to give me!

j.

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