Hi all!
I just got a van to store tools in, and also a free Optima Red Top battery N9978RED 1000CA (I think its AGM) to power the door locks (which I don't have a key to) and some LED lighting. The van is disabled (engine shot) and will be sitting in a field far away from power. The battery is down but will take a charge which I will top up with a Gel cell charger before I put it in the field.
Another friend gave me a solar charging panel about 6" X 12" which comes with battery clips. I think its a "battery maintainer", but its a Chinese jobby, so no identifying markings. On a sunny day, it puts out 22+ volts (open load voltage) and short circuit current of 70ma. I want to use it as a charge maintainer for the battery. Will it work in this capacity as is? Is there any problem with just hooking this device straight up to the battery? Or do I need a "charge controller" in between? The suggested charge rate is C/20 for this battery. http://www.artecindustries.com/Optima-Battery-Group-78-Red-Top_p_27.html
What I'm concerned about is when this slow trickle charger does bring the battery up to max capacity, will it continue charging? And is there a circuit that I should use for stopping that? Is that what the charge controller does? Or can this unit be used without a charge controller/as is?
Oh, further: Upon hooking the solar panel up to the battery for a minute today, the voltage output plummeted to 11.5 volts now that it was under load. Putting the ammeter in series, I couldn't really detect much current flow... maybe 10 to 20ma, if that. Any idea if that's normal or should it settle around 13.5V somewhere?
Any ideas would be welcome as I've never experimented with solar chargers, AGM batteries, or charge controllers. Thanks and all the best!
Privateer2001
I just got a van to store tools in, and also a free Optima Red Top battery N9978RED 1000CA (I think its AGM) to power the door locks (which I don't have a key to) and some LED lighting. The van is disabled (engine shot) and will be sitting in a field far away from power. The battery is down but will take a charge which I will top up with a Gel cell charger before I put it in the field.
Another friend gave me a solar charging panel about 6" X 12" which comes with battery clips. I think its a "battery maintainer", but its a Chinese jobby, so no identifying markings. On a sunny day, it puts out 22+ volts (open load voltage) and short circuit current of 70ma. I want to use it as a charge maintainer for the battery. Will it work in this capacity as is? Is there any problem with just hooking this device straight up to the battery? Or do I need a "charge controller" in between? The suggested charge rate is C/20 for this battery. http://www.artecindustries.com/Optima-Battery-Group-78-Red-Top_p_27.html
What I'm concerned about is when this slow trickle charger does bring the battery up to max capacity, will it continue charging? And is there a circuit that I should use for stopping that? Is that what the charge controller does? Or can this unit be used without a charge controller/as is?
Oh, further: Upon hooking the solar panel up to the battery for a minute today, the voltage output plummeted to 11.5 volts now that it was under load. Putting the ammeter in series, I couldn't really detect much current flow... maybe 10 to 20ma, if that. Any idea if that's normal or should it settle around 13.5V somewhere?
Any ideas would be welcome as I've never experimented with solar chargers, AGM batteries, or charge controllers. Thanks and all the best!
Privateer2001
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