In 2009 I bought (4) SolarWorld 175 Watt panels (44.4Voc, 35.4 Vmp, 5.3Isc, 4.9Imp, 63.4" x 31.9") and a Xantrex Model C40 Solar Charge Controller. My system is 24v. I would like to upgrade the charge controller to the Outback Power Flexmax 60 MPPT, which was suggested at the time of purchase. I am in Phoenix and would like to know if this controller will work with the summer heat or do I need to up the open circuit voltage?
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