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Old 08-30-2011, 08:14 PM   #1
hbrown's Avatar
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generac propane generator loaded voltage?

hello all hope this is the right place to post. after searching and reading alot, i have a generator question.

generac propane 6600 at idle shows 123volts on my digital meter and on cheap plug in guage in wall socket in green approx 120ish

loaded with both acs running on 105 degree day voltage is in red on cheap guage aprrox 110-112 ish, digital meter 115 to 116 motor running smooth, and did a comp test cold was 150psi even on both cylinders and plugs look new, no oil at all on them

now on my shore power 50 amp 123 on dig guage and in green 120-121 ish on cheap guage.
fire up both acs and dig meter goes 120-121 and green 120ish on cheap meter'

is this acceptable on a hot day, or do i risk hurting anything? should i trash cheap meter and go by my digital multimeter?

if not acceptable any ideas on what to check?

i find tons of onan stuff ,but limited on generac.

i also cleaned slip rings or polished armature and brushed look new,but scuffed them any way and no change.

generator runs excellant otherwise

thanks to any and all help if i do have a problem.


2000 tradewinds 7370
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Old 08-31-2011, 05:20 AM   #2
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We talk about 110AC but in reality it should be 120 +-10% so you are normal.

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Old 08-31-2011, 06:13 AM   #3
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Howard, it is quite normal for a generator's output voltage to be around 110 with full load. As Shadowcatche pointed out, 120V - 10% = 108V is generally accepted as the lower limit for normal AC voltage. My Generac in our old coach did the same thing at near full load, and the same thing with the Onan in the new coach.

50A shore power voltage should be higher than your generator output with the same load, the service entrance is rated at 200A minimum and, needless to say, utilities have a lot more generating capacity!

I'd say there is no problem, you're generator is working fine.

The cheap meter will give you a rough indication of too much load. If I were you I'd monitor with it since you can leave it plugged in all the time but if you get concerned (voltage gets under 108 on it) get out the DMM.
Stewart, Brenda and kids
2008 Newmar Canyon Star 3410
2006 Roadtrek Versatile 210
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Old 08-31-2011, 09:18 AM   #4
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Thanks shadowcatche and luv2go!!

This is great news. Thought I was fixin to spend more money and this is only my second weekend outing LOL

Thanks again
2000 tradewinds 7370
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generator, propane

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