Lt.Dan
Solar Wizard
Hey guys, I need some help with temp calculations. Heres what I have going on;
I have 12x Sunpower 240w (spec sheet attached to this post). They are wired in a 3S4P fashion. I have a wire run of 150ft to the battery. VOC is 145.8v. Temperatures never get below 0*C where I live, but it has gotten close. My calculations show VOC could get up to 157v at 0*C. Now here is where I have a hiccup and need help...
At 150ft, and with the peak current at 23a (rounding down a little), a voltage calculator spits out 148v. Does this mean its safe to use a SCC that has a 150v VOC? Or can I not count on the voltage drop because first thing in the morning there will be very little current, thus, very little voltage drop?
I have a feeling I need to step up to a much more expensive 200v SCC.
I have 12x Sunpower 240w (spec sheet attached to this post). They are wired in a 3S4P fashion. I have a wire run of 150ft to the battery. VOC is 145.8v. Temperatures never get below 0*C where I live, but it has gotten close. My calculations show VOC could get up to 157v at 0*C. Now here is where I have a hiccup and need help...
At 150ft, and with the peak current at 23a (rounding down a little), a voltage calculator spits out 148v. Does this mean its safe to use a SCC that has a 150v VOC? Or can I not count on the voltage drop because first thing in the morning there will be very little current, thus, very little voltage drop?
I have a feeling I need to step up to a much more expensive 200v SCC.