Thursday, October 30, 2014

How long will it take 12v 80w Solar panel to fully charge a 100A battery?

April 4, 2011 by admin  
Filed under Solar Discussion

Question by kh347247 m: How long will it take 12v 80w Solar panel to fully charge a 100A battery?

Best answer:

Answer by tlbs101
I assume you mean a 100 Amp-hour, 12V lead-acid type battery?

With 12V you can never fully charge a 12V battery. You need a minimum of 13.5V to fully charge the cells. 14.5V would be better. If the battery is low, you can use 12V to bring up the level of charge in the cells, but never to full capacity.

For an 80W solar panel with 12V loaded terminal voltage — that is 6.66 Amps. 15 hours will get a “dead” battery as fully charged as it can be, under the circumstances.

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One Response to “How long will it take 12v 80w Solar panel to fully charge a 100A battery?”
  1. Amy says:

    A 12V solar panel is actually usually at least 17V, so it will charge a 12V battery (which when fully charged is over 14V). They call them all 12V to make it easier, 12V components all work together.

    You never want to use more than half of the power of a deep cycle battery, so you would be replacing about 50 amp hours (ah), not the full 100 amp hours. Depending where you are, you probably get about 5 sun hours a day (total number of sunlight to equal the test conditions the panel is rated under). An 80W panel is probably just under 5A, so to make the math easy, 50ah / 5A = 10 sun hours. 10 sun hours / 5 sun hours a day = 2 days to fill it back up.

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