I've done a couple of load profile studies for heat pumps and solar and
unless the load is primarily air conditioning it's a bad match. Ground
sourced heat pumps in general only pencil out if there is a big air
conditioning load.
The only time I'd recommend a heat pump with an off grid system is if
there was a wind turbine that massively over-produced in the winter. The
PV production curve is exactly backwards.
The clients should take half the money they would have spent on
installing a heat pump and do a thermal efficiency/passive solar
retrofit. Better ROI.
Best,
Hilton
--
Hilton Dier III
Renewable Energy Design
Partner, Solar Gain LLC
453 East Hill Rd.
Middlesex, VT 05602
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