Critique my hypothetical system?
Hi, I've selected some components from the host site that I plan to buy this spring or summer. I would greatly appreciate any feedback you experts might suggest regarding system design, balance of system, component selection, breaker sizes, wire sizes, anything goes. I've listed everything in order from the Panels down to the battery bank and given some rationale as to why I selected those components.
Sizing: Sized by analogy to my RV battery and then "designed to cost". I can boondock for 2 days with no solar off my 80 AH RV battery, if I conserve a lot. Knowing what I can get by on, and knowing I can buy a larger system, I "designed to cost" of around $2,000 dollars. (I think solar companies would get more sales if they designed to cost, then explained the limitations of the system) This is for a 300 Sq ft. weekend cabin on the OH, KY border. Cistern, RV LED lighting, propane fridge etc.
Panels: 2 Kyocera Ku-270 for nominal array size of 540 watts. Vmp 31, Imp 8.71, Voc 38.3 Isc 9.43 roof mount 45 degrees (12/12 roof pitch). Open to suggestions, picked this because I have a 150 watt Kyocera and it seemed to be of high quality. Good balance between name brand and $/watt. Freight shipping is a bummer.
Panel to controller wiring TBD: I don't know if I should wire series or parallel. Is there such thing as too much head for a charge controller (FM60)? I have not been able to find out the implications. Wire length could be about 35 feet. If Parallel I will buy a combiner box and run 8 gauge cable, if series I'll just by the H4 10 gauge solar cable. 15 amp or 25 amp breaker depending on configuration.
Charger FM 60: I'm in that awkward size of too big for a 30 amp controller. I like the data logging and features the FM 60 brings.
Charger -> Battery 4guage 60 amp breaker 5ft at most
Battery Bank: 2 Crown CR-275. 275 AH @ 12v. My wife is from the town where the crown factory is, and I'm there often. I can get the batteries for wholesale without shipping.
Inverter: SA300 w 50A breaker 6 ga wire, short wire length TBD. Almost all loads are 12vdc so the inverter will see battery charging duty and small loads not worth starting the generator for.
Battery Charger: Iota DLS45, 6 ga wire 45 amp breaker
Miscellaneous: Midnight Surge Protector. Does this go inline between the panels and charge controller? Analog meters, I think they are cool so I will add some mostly for fun. Roof mount racks, I don't know what I need I will ask NAWS on the phone. Stud rings, baby boxes, battery interconnect cable for series connection (not sure how to size this). I already own a Honda EU6500 IS tri fuel genny.
Thanks for reading,