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What size genset for frig? #4530198
09/30/17 12:00 PM
09/30/17 12:00 PM
Joined: Aug 2005
Posts: 463
Taxachusettstan
Ed_T Offline OP
Ed_T  Offline OP
Joined: Aug 2005
Posts: 463
Taxachusettstan
Have a 2011 Maytag kitchen refrigerator, tag says 7.1 amps. Does not say if this is running or starting surge amps. Seems like a ton of amps for running, at around 800+ watts.

For those of you with frig/gen experience, what size generator output am I looking for with this frig? I'd like to stay around 2,000 watts surge rating for fuel efficiency reasons, but I am fearful that is nowhere near enough starting surge power. Opinions welcomed...

Re: What size genset for frig? [Re: Ed_T] #4530216
09/30/17 12:18 PM
09/30/17 12:18 PM
Joined: May 2006
Posts: 4,012
Central Wisconsin
dwendt44 Offline
dwendt44  Offline
Joined: May 2006
Posts: 4,012
Central Wisconsin
Amps X Volts=Watts.

Always figure heavy. 12 amps(a guess) starting would need
1400 watts, so 2000 should work if that's all your feeding.


My 2


There's no such thing as:
Too big of a battery,
Too large of a gas tank,
or too loud of a horn,
or too bright headlights.
Re: What size genset for frig? [Re: Ed_T] #4530217
09/30/17 12:20 PM
09/30/17 12:20 PM
Joined: Dec 2011
Posts: 743
US
clarkflower Offline
clarkflower  Offline
Joined: Dec 2011
Posts: 743
US
Google How many watts does it take to run a refrigerator on a generator?
Many devises need more power to start up (Maximum Output Watts) and then require less power (Rated Watts) to run continually. For example, a refrigerator requires 2200 starting wattage with a 700 running wattage, so you would need a generator with at least 2200 watt maximum output.

Honda says less https://powerequipment.honda.com/generators/generator-wattage-estimation-guide

Last edited by clarkflower; 09/30/17 12:21 PM.
Re: What size genset for frig? [Re: Ed_T] #4530259
09/30/17 01:14 PM
09/30/17 01:14 PM
Joined: Dec 2002
Posts: 42,085
New Jersey
JHZR2 Offline
JHZR2  Offline
Joined: Dec 2002
Posts: 42,085
New Jersey
Many of the starting load requirements are overstated and drive to buying oversized and thirstier generators.

Re: What size genset for frig? [Re: Ed_T] #4530348
09/30/17 03:04 PM
09/30/17 03:04 PM
Joined: Jun 2003
Posts: 17,343
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,343
Deplorable in apple valley, ca
My 800w 2 stroke hf genny ran my fridge and moms oxygen machine at the same time.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: What size genset for frig? [Re: Ed_T] #4530371
09/30/17 03:37 PM
09/30/17 03:37 PM
Joined: Jun 2003
Posts: 33,073
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,073
ME
I have also done it with my HF 800 watt two-smoke.

What I did to get it going was I ran a power strip at the end of the extension cord with a hair dryer on it on low (800 watts) to load the generator then I killed the hairdryer while simultaneously plugging in the fridge. In the time since, I think I broke said generator in as it makes more power and I don't have to do the hair-dryer thing.

But my kill-a-watt meter says my fridge takes 280 watts running. It's a whirlpool with 6.5 Amps on its data plate.

Beware the defrost cycle, about 2x a day, runs on a timer and uses a bit more power.

That all said I'd get a small 4-stroke generator of the 1500 watt sizing for efficiency. 2-strokes blow 10+ percent of the incoming gas straight through the exhaust.

Take note that a conventional 3600 RPM non-inverter generator has an engine flywheel spinning along, so when it's suddenly loaded, the flywheel carries it through. Generally enough for the compressor's locked rotor inrush current.

Re: What size genset for frig? [Re: eljefino] #4530387
09/30/17 03:55 PM
09/30/17 03:55 PM
Joined: Sep 2004
Posts: 2,427
snowblind in TX
punisher Offline
punisher  Offline
Joined: Sep 2004
Posts: 2,427
snowblind in TX
Originally Posted By: eljefino


Take note that a conventional 3600 RPM non-inverter generator has an engine flywheel spinning along, so when it's suddenly loaded, the flywheel carries it through. Generally enough for the compressor's locked rotor inrush current.


Great observation. Something like a 5500 BTU AC will usually trip the breaker on a 1000 watt inverter unit, but start OK on that little HF unit.

Re: What size genset for frig? [Re: Ed_T] #4530389
09/30/17 03:57 PM
09/30/17 03:57 PM
Joined: Jan 2013
Posts: 1,350
America's Dairyland
LotI Offline
LotI  Offline
Joined: Jan 2013
Posts: 1,350
America's Dairyland
My Champion 1600W inverter runs a fridge just fine


03 Honda Interceptor
11 Kawasaki KLR 650
12 Ford E450
17 VW GTI
[IMG]http://badges.fuelly.com/images/sig-us/803455.png[/IMG]
Re: What size genset for frig? [Re: Ed_T] #4530441
09/30/17 04:52 PM
09/30/17 04:52 PM
Joined: Dec 2003
Posts: 9,795
Florida, Cape Coral
Eddie Offline
Eddie  Offline
Joined: Dec 2003
Posts: 9,795
Florida, Cape Coral
With a Honda 2000 inverter gen, I was running a std refrigerator ~ 600 Watts, a 46 inch TV ~ 300 watts, 2 60 watt lights and a computer without any issues for 3 days continuous except for gas fill ups. Ed


CX5 Touring 2.5L :-)
Re: What size genset for frig? [Re: Ed_T] #4530478
09/30/17 05:49 PM
09/30/17 05:49 PM
Joined: Mar 2004
Posts: 20,747
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 20,747
Upstate NY
I would buy or borrow a clamp on ammeter with peak hold. Before spending money on a generator.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: What size genset for frig? [Re: Ed_T] #4530496
09/30/17 06:07 PM
09/30/17 06:07 PM
Joined: Sep 2015
Posts: 5,845
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,845
Kalifornia Kollective
So a fridge is basically an A/C compressor. Load side pressure is low at start-up unless it is running nearly continuously (?). That motor starting load is based on starting current to come up to speed and then running current based on compressor load. The starting current is mostly fixed. The compression load varies depending on how long between cycles. And that depends on delta T between ambient and internal temps and insulation value ...

You need to factor worst case. 110* outside and the house is hot and the wind is blowing and tree goes down. Now you have to generate enough t start a frequently cycling refer. More load.

Never skimp on gen set. You will just hurt the gen set and maybe your appliances. Better to get a bigger gen set and a more efficient motor, than a smaller gen set ...

Fuel is cheap. New refer, not so much ...

Last edited by BrocLuno; 09/30/17 06:09 PM.

Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: What size genset for frig? [Re: Ed_T] #4530606
09/30/17 08:38 PM
09/30/17 08:38 PM
Joined: Feb 2003
Posts: 7,421
Jupiter, Florida
Cujet Offline
Cujet  Offline
Joined: Feb 2003
Posts: 7,421
Jupiter, Florida
The Honda EU2000 will do it with zero effort, as I've done it for weeks.

The suggestion above is a good one a small generator with 4 stroke engine will also do it without any issues. Champion makes an 80cc, 4 stroke, 1200w/1500w unit that would easily and efficiently run the fridge, with power left over for lights. They used to sell for $99 but are now about $180-200, and are known to last thousands of hours.

Last edited by Cujet; 09/30/17 08:44 PM.

People who count on their fingers should maintain a discreet silence.
Re: What size genset for frig? [Re: Ed_T] #4530889
10/01/17 07:21 AM
10/01/17 07:21 AM
Joined: Feb 2015
Posts: 2,195
Slovenia EU
Kamele0N Offline
Kamele0N  Offline
Joined: Feb 2015
Posts: 2,195
Slovenia EU
Germans are slightly overexeggerating but maybe you will find that tabel useful

http://www.kipor.org/technik.php


2011 Hyundai i30 1.4 CVVT Shell Helix Ultra 5w40
1997 Toyota Landcruiser KZJ95 3.0 TD Shell Rimula R6M 10w40
Re: What size genset for frig? [Re: Ed_T] #4530890
10/01/17 07:25 AM
10/01/17 07:25 AM
Joined: Feb 2015
Posts: 2,195
Slovenia EU
Kamele0N Offline
Kamele0N  Offline
Joined: Feb 2015
Posts: 2,195
Slovenia EU
Kuhlshrank is refrigerator smile


2011 Hyundai i30 1.4 CVVT Shell Helix Ultra 5w40
1997 Toyota Landcruiser KZJ95 3.0 TD Shell Rimula R6M 10w40
Re: What size genset for frig? [Re: Ed_T] #4530901
10/01/17 08:05 AM
10/01/17 08:05 AM
Joined: Jul 2015
Posts: 477
Pennsylvania
Astro_Guy Offline
Astro_Guy  Offline
Joined: Jul 2015
Posts: 477
Pennsylvania
Maybe you can extrapolate something from my experience with a Champion 3500 watt running / 4000 watt peak generator. I've managed to run three refrigerators and one 15 cubic foot freezer simultaneously. One refrigerator and freezer are on the same circuit, so there is a pretty good chance that they start at the same time when that circuit gets energized. That's the first circuit I energize, and the generator does slow down momentarily. It doesn't bog down.

I've also got the gas range with electric ignition wired to the generator via a transfer switch. The electric ignitor for the oven has a more noticeable impact on the generator than the refrigerator and freezer starting, but then the generator is more heavily loaded at that point.

One thing yet to be mentioned in this thread is that a refrigerator is an inductive load. There will be a momentary drop in voltage when it comes on, which will reduce the current it draws. I've seen guidelines for commercial applications suggesting that you can get away with 70% of the nameplate starting amps because of this. In your case, that means you should be fine with 5 amps or perhaps as little as 600 watts. That latter figure does seem consistent with some of the other advice posted here.


'01 Volvo V70XC, 228k, 0W-40 M1
'16 Accord, 17k, 0W-20 M1 EP
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