[PNW Fireguy]

I think that two different scenarios have been discussed within the thread leading to the confusion. Earlier someone posted that they were using a100/20 MPPT charger. The Hitech panels have a Voc of 24.9 v Four of them in series will exceed the 100v input with temp corrected Voc. A 150/85 would be the correct choice with respect to voltage in that scenario. I have two strings of six panels in series resulting in an uncorrected voltage of about 150Vdc output from each string. With recent US temps my array would have easily surpassed the input limit of a 150v charge controller. This is why temp correction is very necessary. In our case a 250v charge controller met out requirements though the two strings will never put out anything near the 60 amp limits of the controller. The array can push near 200v in cold weather.