Hi, getting close with my solar
install, have the big parts
but need to get the "bits" worked out. I have a question regarding circuit and panel protection.
two 225W Sanyo solar panels
in series. Specs per panel are Voc=53V, Isc=5.66A, Vmp= 86.8V, 12ga MC4 connections from panel, switching to 10ga for wiring
from panel wiring to MPPT
charge controller for minimal V drop (not a big concern anyway with such high voltage). (See pic for other specs).
Since I'm putting them in series, I'll have a Voc=106V, Isc= 5.66A. This will run for about 30 ft (each way) to an Outback 60. The Outback 60 will feed into my power busbar about 5 ft away. I'm going to use a #2 AWG to minimize V drop again here. For overcurrent protection I plan on using a 60A 12V breaker close to the busbar instead of a fuse so I have flexibility to isolate the solar
system from the rest of my DC system. I'll probably use this one: MRCB 60, 80, 100, 150 Amp DC circuit breakers with switch
I also want (and think it is required) circuit protection in between my controller and panels
, located as near the panels
as possible (still probably a 12 ft run to get into the inside of the boat). I'd like breakers, again to isolate the panels from the controller easily in case I need to do open it up.
For those that are using breakers to isolate their series-wired panels, what are you using? Most DC breakers I've seen are rated up to only 48V or so? I found these from Midnite solar: Midnite Solar MNEPV 150 VDC Solar Array Breakers
, and I guess I could put it in this box: Midnite Solar Baby Box Enclosure for 1-4 Din Rail Breakers
, but it seems kinda bulky and am guessing there is an easier solution. I'd go with the 15A breaker.
Or do folks just add an in-line fuse and pull the fuse if they need to open up their charge controller? Or do you just use a blanket and hope the wind
doesn't blow it away?