Registered: 1495777728 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?
Registered: 1362754383 Posts: 137
Reply with quote #2
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. __________________ Gordy, Minnesota
Registered: 1388591029 Posts: 2,703
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.
__________________ Solar is like the wind. It may be free, but putting it to work isn't! Willie, Tampa Bay
Rick H Parker
Registered: 1489180564 Posts: 727
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.
__________________ Rick H Parker Kansas, USA Electronics Engineering Technologist