Seeking Advices to minimize Voltage drop
I am a new comer to off grid solar.
I am gathering information and advises for a small 12V system for my summer home in the Caribbean.
I currently own:
4 300 watt Solarworld panels (VOC 40v, VMP 32.6v, ISC 9.3A, IMP 9.31A)
6 Agm 100Ah batteries
1 MNPV6 Disco Combiner Box
1 MPPT Charge controller Midnite Solar Clasic 150
1 Pair MC4 Solar panel cable Y connectors ( M/FFF F/MMM)
1 3000w Xantrex pure sine Charge controller.
Solar panels combined (series/parallel) using the Y connetors on concrete roof about 25feet from the MNPV6 combiner box.
The combiner box will be located at about 30 feet from the Charge controller. the batternes are at 6feet away. All the cable will be fished thru 1-1/4 PVC conduit on the roof as well under ground to the house.
My questions are the following:
A) size Breaker to use in the combiner box (15 or 20A)?
B) size cable to use from the Connectors to the combiner box? to keep voltage drop below 4%
C) cable size from combiner box to CC
D) do Ineed more battery and or more panels?
This solar system will be used 24/7 for a mid size refriginator/freezer, and a 17 cubic feet freezer. There will 3 or 4 Led 15w lights in use for 3 to 4 hours at night. Also 3 ceiling fans for a few hours when the 8000btu air conditioner (power by a generator) is off. There will be cell phones to charge as well as the use of 2 laptops for about 2-3 hours a day.
All advises or comments are appreciate.
BTW: should I be concerned about performance issues due to the additional heat which will be generated by the concrete roof. If so, how to treat this matter? tks