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post #11 of 15 Old 12-30-2015
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Re: solar panels

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Hi,

Harbor Freight sells 1.5 watt ($15.00) solar charges. I have used it to maintain a car battery when we are away for extended amount of time. What I want to do is use them as a back up for my boat battery over the winter should we lose power as I keep the boat in the water. She is a 1958 wooden boat and takes on some water, need the pump to work.

Thank you for your help,
Joe
You're going to need more than that little panel for that.

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post #12 of 15 Old 12-30-2015 Thread Starter
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Re: solar panels

Gary,

I did not mean to run the pump, just keep the battery up if the power failed

Joe
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post #13 of 15 Old 12-30-2015
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Re: solar panels

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Gary,

I did not mean to run the pump, just keep the battery up if the power failed

Joe
Still will not be enough....

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post #14 of 15 Old 12-31-2015
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Re: solar panels

anecdotal evidence; but.......
A Bud runs HF rig at camp Takes a 5 w roll-up panel eight hours to fill a set of AA batts in his handheld ! A seperate 15 w panel to recharge his small (30Ah ?) gel for running the vehicles transmitter takes several hours of brite sun to get it going again; not necessarily filled to the brim.

A 15 w panel is ner to 1 A. A regular car charger on 2 A setting takes *how* long to refresh a dead group 24-7 batt enuff to stat car?? Granted; a started take a helluvva lotmore juice tthan a bilge pump; but that's one item ( the pump) I wouldn't want to go begging for power !

HTH,
Paul

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'80 Watkins 27
North East, MD
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post #15 of 15 Old 12-31-2015
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Re: solar panels

Quote:
Originally Posted by jlt1149035 View Post
Hi,

Harbor Freight sells 1.5 watt ($15.00) solar charges. I have used it to maintain a car battery when we are away for extended amount of time. What I want to do is use them as a back up for my boat battery over the winter should we lose power as I keep the boat in the water. She is a 1958 wooden boat and takes on some water, need the pump to work.

Thank you for your help,
Joe
$10.00 per watt is really quite expensive..... That said even in optimal conditions a 1.5W panel is only capable of producing 0.12A. This is barely enough to keep up with self discharge in warm weather let alone a bilge pump or stereo memory or what ever else is bleeding on the system. If the batteries were fully charged and fully isolated then a 1.5-3W panel could "maintain them" in cool weather. A 10W panel would be a far better "maintainer" and you should be able to find one for under $3.50 per watt or a far better deal and HF....

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