I currently have Blue Sky 2512i charge controller. Great unit! We have three 75W panels in parallel. Blue Sky limits the Voc and Vmp to 28V and 16.5V-18.5V. We would like to get a fourth panel to get a little more charge to our system.
Can we do a series/parallel combination with this controller?
Our batteries are 12V. But, can we send 24V "nominal" to the charge controller, or is the Voc and Vmp additive when the panel are in series, thus putting us over the 28V Voc and 16.5-18.5 V Vmp limit?