Found it Hard To Find Battery Panel Charger ? Then This is The Place For You!
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 SOLAR PANEL BATTERY CHARGE CONTROLLER 40A 12V 24V PWM  US $851.99
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 Solar Regulator Charge controller 40A LCD 12 24V PWM US $809.39
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 Solar Panel Battery USB Charger for Cell Phone MP3 PDA US $14.99
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 6V 12V Solar Panel Multi Purpose Charger US $19.99
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 30A 12V 24V LCD Screen Digital Solar Charge Controller PWM US $45.00
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 SOLAR PANEL BATTERY CHARGE CONTROLLER 30A 12V 24V LCD Screen PWM US $42.75
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 2400w solar panel regulator charge controller 48v 50a US $199.99
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 20W 20 WATT SOLAR PANEL BATTERY TRICKLE CHARGER KIT RV US $79.83
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 New 12V 6 Watt 400mA Solar Panel Power Charger US $34.99
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How do I know if my solar trickle charger is working?
I attached a solar trickle charger to a small lead-acid battery. I tested the panel alone and it was producing 19v, but when I attached it to the battery the voltage was the same as the battery alone (12.44v). I then put a multimeter between the positive output of the panel and the positive on the battery to see if any current was flowing into the battery, and it said 0mA, so I would assume that it is not working. Is the panel just not big enough for the battery or am I missing something?
19V is good for charging a 12V battery, once connected to the battery it will get pulled down to the battery voltage. If the battery is measuring 12.44V it sounds like it is really low, it should be close to 14V when full. Depending on the size of the solar panel, it will likely take days to charge it back up.
You can test the solar panel without the battery with the amp meter. Just set the meter to measure amps, you may need to move one of the leads, and measure across the plus and minus wires like you did to measure the voltage. You can watch this video for step by step instructions http://www.altestore.com/video/video-Solar-Panel-Testing-v3/. If there is current, it is working. If the battery doesn't get charged after a few days, the battery may be dead from being drained too much.