BTW: There have been several threads lately where adjusting the Voc for temperature has come up. This prompted me to write up a resource about how to do it.
When designing you solar panel system, it is important to adjust you solar panel Voc for temperature in order to ensure you do not over-voltage the PV inputs of your solar charge controller. This paper shows how to calculate the Temperature...
diysolarforum.com
Very good thanks, There are several string calculators available online but they are tailored for that manufacturers gear. These can be found at :
Morningstar Solar
MidNite Solar midniteftp.com
BUT......These have been tailored by their respective controllers and as such only list the maximum v.o.c. capabilities of their respective controllers.
The one at Morningstar has the individual solar panels listed including the VOC temperature coefficient, The MidNite one does not list individual solar panels so you need to find the maximum VOC temperature coefficient.
I learned the hard way frying a B-Z 500 controller with First Solar FS-1 CdTe panels which have a very high VOC of 76 volts and a very high VOC temperature coefficient.
Most solar controllers are irretrievably destroyed by VOC exceeding the published limit.
The only ones that i know of having a tolerance of exceeding the maximum VOC is the MidNite Classic and the MidNite Kid units. They have a feature called “Hyper VOC” where the controller shuts down to protect the front end of the MPPT input stage.
Since the controller of the B-17 inverter/controller is based on the Classic units and the Barcelonia is the next generation Classic I would bet that these units also have the “Hyper VOC” feature built in. As these units are still in the ALPHA or BETA testing stage specifications have not been released yet.