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10
Going solar - heat pump upgrade
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Student loans are paid off so I’m looking at getting solar and heat pump:

Silfab Solar SIL-370 HC & Enphase Energy Inc. with micro inverters IQ8H-240-72-2-US: 6.67 kW with 18 panels rated 370 w ($17.7k; $13.k after tax credit) Friend has similar sized system and generated 11 MWh in the last year

Converting from an old 85% efficient gas furnace to heat pump. I’m pretty conservative when it comes to heating/cooling (electric bill average $53 and gas avg $73 month). Total annual consumption (from electric bill) is 6,348.00. For gas estimate, straight therm to kWh (1:1) is 14666 kWh. I had found a coefficient HP Electric COP therm to kwh conversion (8 kwh = 1 therm) so then therm to hkw would actually be 4,004 kwh. So in theory, I need 10,352 kwh for the year.

Option 1: HVAC contractor #1 pushed hard for a hybrid dual fuel gas- heat pump, but offered us this option when he sent the quotes. No state incententive.

3 ton; 9.6 HSCP/ 18 SEER - Air handler CBA25UHV-036/heat pump EL18XPV-036-230 Lennox pure air & smart thermostat. Variable motor speed, required electrical upgrade (90 amp to run heat strip and 6 slots in the electric panel; although digging online (pg 17) suggests I need 60 A based on BTU at 10 kW?). HP: 230 A system, 34,400 BTU cool, 32,000 BTU heat; $14,818

Option 2: Very reputable HVAC contractor #2 said he also preferred the hybrid system to have backup and gas is cheaper, but worked tirelessly to answer questions and provided several options on site for fully electric for solar. I’m still waiting on the actual quotes based on what we looked at. I think it is the mid level Bryant Preferred 2-stage Heat Pump 226A - 3 ton/ 9.5 HSPF/ 17 SEER unknown air handler. Don’t need to upgrade electrical, requires 2 slots in existing panel. Said that this should handle temperatures in mild Oregon winter just fine (average low is about 34F and average high is 46F in Dec/Jan). Can add the heat strip later if I need to. Estimate was ~$15k.

So base price is about the same; but option 1 will require electrical upgrade ( $). But trying to figure out the math for energy consumption is harder than I thought…

Questions: - Thoughts on the hybrid vs electric heat pump while being solar? - Will one of these electric heat pumps work under listed solar system? Or should I buy more panels.

Trying to not break the bank too hard since I’m going to do a cash out refinance …

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2 years ago