[RE-wrenches] Off grid heat pumps

[Hilton Dier III]

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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