Sanity check and suggestions for BEopt: PV and minisplit for 1200 sq. ft. two-bedroom new construction
This is probably going to ramble as I try to organize it.. I’ve been a member on here for several years, and have done a lot of reading, and thinking, now its time to use the info gained.
Having a couple issues wrapping my head around interpreting what BEopt is trying to tell me.
I’m in central NY, (zone 6) planning stages for a 2 story 30×40, first floor FPSF workshop with 10′ ceilings, second floor clear span floor trusses, living quarters 8′ ceilings, 2 br, 1 or 1.5 bath, open kitchen/living area (guess you could call it a great room, but its nothing fancy), raised heel trusses for the roof, 2′ overhang on all 4 sides.
starting plan is:
EPS under/around slab
2×6 walls, zip sheathing taped as the air barrier, reclaimed polyiso, more osb (instead of furring strips), wrb (which one TBD), and vinyl siding (I hate vinyl siding fwiw, but don’t think there are many alternatives in the budget right now)
Was planning on using a mini split to heat/cool the upstairs, the workshop area is probably going to get one too, but may end up with radiant heat (plan on putting pex in the slab as a backup either way)
There is no natural gas available, electricity supplier is NYSEG, basic monthly charge is $17.40 electricity is roughly $0.08 daytime, and 0.07 night. (last bill was $48.13 for 373 kwh)
PVwats shows the annual solar radiation for my location is 4.4 kWh / m2 / day
BEopt always shows that the biggest PV array I choose as an option gives the lowest costs, and that the more insulation I choose gives the lowest costs.
I’m looking for advice on my ideas so far, and any suggestions as to what I’m doing wrong in BEopt, as somehow I’ve got it ignoring initial cost and just going for the lowest energy use
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