Solar Panel Controller Advise
A friend of a friend has a new never used Grape Solar 280 watt polcrystalline solar panel and a 2210RN solar charge julator 12/24 controller for sale. He bought them and decided not to install them. ...
Forum Discussion
Tom and Esox are incorrect.
The controller is a 20 amp controller. That is it's output rating regardless of voltage. So, at 12v it is capable roughly of 12v x 20 amps or 240 watts. At 24v it is capable of roughly 24v x 20 amps or 480 watts. Their figures of 260 and 520 take into account that at charge the voltage would be higher than the nominal voltage. 260/12 = 13v and 520/24 = 26 volts.
So, if used with this 280 watt panel on a 12 volt system the controller's output will be limited to 20 amps which will sacrifice a few watts under certain conditions.
That's probably not a big deal if the controller is really cheap. But, for my money I'd be looking at a Blue Sky or Morningstar controller.
The controller is a 20 amp controller. That is it's output rating regardless of voltage. So, at 12v it is capable roughly of 12v x 20 amps or 240 watts. At 24v it is capable of roughly 24v x 20 amps or 480 watts. Their figures of 260 and 520 take into account that at charge the voltage would be higher than the nominal voltage. 260/12 = 13v and 520/24 = 26 volts.
So, if used with this 280 watt panel on a 12 volt system the controller's output will be limited to 20 amps which will sacrifice a few watts under certain conditions.
That's probably not a big deal if the controller is really cheap. But, for my money I'd be looking at a Blue Sky or Morningstar controller.
