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JiminDenver wrote:
The best I've seen out of my panel at a mile of altitude has been 12.75a (high noon, subfreezing) so I don't think he will be being derated too often.
โApr-08-2014 08:01 AM
โApr-08-2014 07:44 AM
JiminDenver wrote:Good input. The OPs linked calculator shows 43V for his conditions and that's 173V for 4 in series. I would not want that on a 150 VOC maximum rated controller.
I recently tested my Canasdiansolar 220w in subfreezing temperatures, The voltage shot to over 40v for a few minutes until the sun warmed the panel. After that it stayed at 37v. It is rated foe 36.6v.
โApr-08-2014 05:22 AM
CA Traveler wrote:2oldman wrote:NO! NO! NO! 36.6V*4=146.6V. Those specs are for nominal conditions. Typical variations include edge effects and temperature changes - try serial and you'll blow the controller.nvreloader wrote:Looks like that controller is good to 150vdc PV input. By far the easiest wiring is 4 panels in series with just 2 small wires to the controller.
Tristar-MPPT-60a,w/ battery temp gage will be mounted.
Is there a better/easier way, to route all these panel wires?
There are controllers that derate for over VOC but don't exceed 150V for the MS MPPT 60 controller.
โApr-07-2014 10:07 PM