Ductless Heat Pump Power Draw & Generator Output

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Bobomo
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Ductless Heat Pump Power Draw & Generator Output

Post by Bobomo » Sat Mar 02, 2019 9:36 am

For the first time in the decade we've been in this house, we just suffered a lengthy power outage during a snow storm. So, naturally, I'm suddenly very interested in getting a generator and backup heat source! :lol:

We just recently got an "efficient" ductless heat pump system (Mitsubishi M-Series). The specifications state the following:

Power consumption rated (min-max)
Cooling: 410-2200 W
Heating @ 47˚F: 430-3360 W
Heating @ 17˚F: 2480 W (max only)

Does this mean if I get a gas generator with a rating of e.g. 6875 starting watts and 5500 running watts I can power the unit with some overhead?

Thanks!

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emtnut
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Re: Ductless Heat Pump Power Draw & Generator Output

Post by emtnut » Sat Mar 02, 2019 1:25 pm

Is this the 'MUZ-FH15NA' model ? (seems to match the specs you posted)

The compressor has a locked rotor amps of 15, so it shouldn't surge past 3600W.

I wouldn't want to have a load on the gen, and start this thou. (unless it's just a few lights)
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Bobomo
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Re: Ductless Heat Pump Power Draw & Generator Output

Post by Bobomo » Sun Mar 03, 2019 10:22 am

Yes, that's the one. It's all hypothetical, so I could get a generator of the appropriate size. What would you suggest?

I'd want to be able to power a refrigerator and a power strip for low power electronics and phone charging.

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Shannon
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Re: Ductless Heat Pump Power Draw & Generator Output

Post by Shannon » Mon Mar 04, 2019 7:25 am

what type of heat source does you house have now?
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Bobomo
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Re: Ductless Heat Pump Power Draw & Generator Output

Post by Bobomo » Mon Mar 04, 2019 4:03 pm

Shannon wrote:
Mon Mar 04, 2019 7:25 am
what type of heat source does you house have now?
The ductless heat pump is the primary heat source. There are smaller resistive blowers in other rooms, but I would be less concerned about those in a power outage.

There's no other fuel in the house and our electricity rates are low enough to make installation uneconomical at this time.

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emtnut
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Re: Ductless Heat Pump Power Draw & Generator Output

Post by emtnut » Tue Mar 05, 2019 8:37 am

Bobomo wrote:
Sun Mar 03, 2019 10:22 am
Yes, that's the one. It's all hypothetical, so I could get a generator of the appropriate size. What would you suggest?

I'd want to be able to power a refrigerator and a power strip for low power electronics and phone charging.
Newer fridges take quite a bit less power, the older ones are hogs !

Gen size is usually budget driven, but also consider what else you may want to run. Microwave is a 'hot' commodity in a power failure. Kettle, toaster and freezer as well. Some people want a PC or 2 to be available as well.


For just the heat pump, assuming newer fridge, and the lights, the 5500 watt 'should' be OK. It would be pretty much maxed out, so it could be a close call.
If you have the budget, It would be good to go up to a 7500.
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Bobomo
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Re: Ductless Heat Pump Power Draw & Generator Output

Post by Bobomo » Tue Mar 05, 2019 12:34 pm

emtnut wrote:
Tue Mar 05, 2019 8:37 am
Bobomo wrote:
Sun Mar 03, 2019 10:22 am
Yes, that's the one. It's all hypothetical, so I could get a generator of the appropriate size. What would you suggest?

I'd want to be able to power a refrigerator and a power strip for low power electronics and phone charging.
Newer fridges take quite a bit less power, the older ones are hogs !

Gen size is usually budget driven, but also consider what else you may want to run. Microwave is a 'hot' commodity in a power failure. Kettle, toaster and freezer as well. Some people want a PC or 2 to be available as well.


For just the heat pump, assuming newer fridge, and the lights, the 5500 watt 'should' be OK. It would be pretty much maxed out, so it could be a close call.
If you have the budget, It would be good to go up to a 7500.
Good call on the microwave. Hot food was definitely missed during our outage.

Thanks for advice on generator sizing, I appreciate it.

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emtnut
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Re: Ductless Heat Pump Power Draw & Generator Output

Post by emtnut » Tue Mar 05, 2019 1:06 pm

Bobomo wrote:
Tue Mar 05, 2019 12:34 pm
Good call on the microwave. Hot food was definitely missed during our outage.

Thanks for advice on generator sizing, I appreciate it.
I get REALLY ugly if there's no coffee in the morning !! :lol: ... Kettle is #1 on my list ... then heat :mrgreen:
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