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DJA

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Posts: 1
Reply with quote  #1 
Simply a 100 watt panel connected directly (no control system at all) to a 12 V 56 amp hr lead acid battery, then connected via just an on/ off switch to a fan rated at 15 watts 12 V. It will 'work' (I have seen one working), but will it just sooner or later 'cook' the battery?

Gordy

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Posts: 137
Reply with quote  #2 
DJA,

Yes sooner than later you will cook that battery from over charging. My 10 amp automatic battery charger will boil a full-sized truck battery if left on long enough. Your 100 watt panel divided by 12 volts equals 8.333 amps.

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Gordy,
Minnesota
stmbtwle

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Posts: 2,746
Reply with quote  #3 
Very definitely it will cook the battery, as Gordy said, "sooner than later". Get a charge controller, you can find them on Ebay for less than the price of a new battery.
 

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Rick H Parker

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Reply with quote  #4 
It would cook the battery. You can get a PWM charge controller off eBay for the price of a Starbucks Coffee.
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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
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