Tue Nov 24, 2009 9:09 am
Well, that's a question for a solar system expert which I am not.
Your solar panels have to go through a charge controller of some description, the high end ones have the ability to regulate and step up / down voltages to your battery bank, I have 74v from my solar panels which go through a MPTT Charge controller (Outback MX60's). My batteries are wired in series to give a nominal voltage of 48v, actually fully charged I get 57v! Your solar panels may also have the ability to run in series, but these are typically higher end / higher spec panels that do this. I don't know what your solar system comprises of to know if this is even a possibility.
We have 24x 170w 36v panels, in 12 strings of 74v to 2x MX60, charging 36x 245Ahr 12v AGM batteries, in 8 strings of 4 in series (thus 48v).
If you are using Lead Acid batteries, this won't be possible because you should be equalising them once a month (perhaps more), this equalisation charge with give an over voltage to your POE device causing it to power down. Again I don't know what batteries you have to know if this is even possible. But I'm guessing you don't want power outages as a regular set up.
Josh