small solar panel regulator?
Submitted: Friday, May 22, 2009 at 19:09
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zacc
hi all is there any need to put a regulator on a solar panel 160mm by 160mm. when i put a multimeter on it measures 18 volts . cheers
Reply By:- Friday, May 22, 2009 at 20:17
Friday, May 22, 2009 at 20:17
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Reply By: Member - Porl - Friday, May 22, 2009 at 20:26
Friday, May 22, 2009 at 20:26
So i think the above was a Friday funny.
Without going into it, yes you do.
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Reply By: zacc - Friday, May 22, 2009 at 21:54
Friday, May 22, 2009 at 21:54
even if it only used as a trickle charge?
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Reply By: Member - John and Val W (ACT) - Friday, May 22, 2009 at 22:25
Friday, May 22, 2009 at 22:25
At 16cm square you'll get very little energy out of it. What do you want to do with it? If you're thinking of charging an automotive battery, forget it. It's about big enough to offset part of the discharge due to leakage. You don't need a controller to protect the battery from overcharging!!!
HTH
John
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Reply By: ABR - SIDEWINDER - Friday, May 22, 2009 at 23:38
Friday, May 22, 2009 at 23:38
That would be a 2 watt panel which will produce about 0.15A or a total of 1A per day.
It may keep a battery from self discharge but that is about all.
No regulator needed just a blocking diode so the panel does not in fact discharge the battery.
Regards
Derek from ABR
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Follow Up By: Member - Porl - Saturday, May 23, 2009 at 14:10
Saturday, May 23, 2009 at 14:10
I always thought it wasn't necessarily current (except for wet cell deep cycles batteries) but voltage that can cause problems, thus my yellow top AGM has very specific instructions that it not ever be charged over a certain voltage, 14.something, but nothing mentioined on how restrictions as to amphours.
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Follow Up By: Member - Mike DID - Tuesday, May 26, 2009 at 08:15
Tuesday, May 26, 2009 at 08:15
Solar Panels are constant current devices - they'll put out 18 volts on open circuit (or a multimeter that draws miniscule current) - they'll put out 13 volts if you connect it to a 6 cell battery - 6.5 volts of you connect it to a 3 cell battery - 2.2 volts if you connect it to a 1 cell battery.
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