Charge controller sizing

[getvrtcl]

I am concerned about the sizing of a charge controller.  I have 4 of the panels below hooked in parallel.  I am running 4  T-105 (12vt) for batteries.  I will never increase the size of the system for this building and I would like a trouble free controller.  I am concerned with what amp controller I will need.  I have a cheap Sunforce 30 amp I would like to use, just because I have it.  If I am reading amps right I should be able to because Ip 6.82 X 4 = 27.28   So I think I can get away with any controller rated at 30 amps or above, RIGHT?




EC-120-GL
Pp        120
Vp        17.6
Ip        6.82
Voc        21.5
Isc        7.68
Cells        72

[ghurd]

I would recommend going with Isc, then adding 20% just in case.

4 x 7.68 x 1.2 = 37A
That's up to 40A class.
G-

[dave ames]

If you are in a pinch.. might consider running three panels through the controller and one directly into the battery bank with a diode while waiting for a proper controller.

one unregulated module on a bank that size should be ok. (my opinion only)

Fun stuff, dave