20W solar...need controller?
I have acquired a 20W solar panel that shows 20vdc when not connected to anything (in full sun). When hooked up to a 12v battery, I have seen it as high as 17vdc. I'm wondering if I can get away wit...
Forum Discussion
3 tons wrote:2112 wrote:
You could use something like THIS and a diode between the panel and battery. Adjust it to 13.2V or so at the battery.
This is a very creative idea!!
Might work and might not.
The point is to REDUCE the charging voltage (and current) as the battery charges up. As the internal resistance goes UP, the charging voltage needs to go DOWN.....but a "dumb" power supply does exactly the opposite.
Keeping the voltage constant is only slightly better and would still require some testing and attention.
Get the right tool for the job.
Saving a few pennies up front sometimes costs you DOLLARS on the back end.
