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Open Roads Forum  >  Class A Motorhomes  >  General Topics

 > Ac on generator problem.

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gssfc

NH

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Posted: 08/21/21 09:30am Link  |  Quote  |  Print  |  Notify Moderator

Voltage is at 120 with load or without. Both legs are the same voltage. This is measured at the transfer switch with no load and again with both ac units running.

rgatijnet1

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Posted: 08/21/21 09:41am Link  |  Quote  |  Print  |  Notify Moderator

Whether on shore power or generator I always kept one of the Kill-A-Watt meters plugged in to an outlet. These are less than $20 and will give me an instant readout of the exact voltage and the frequency. With both AC's running you can see if your voltage is low or if your frequency has dropped below 60 cycles. Most appliances will operate within a specified voltage range but keep in mind that the lower the voltage, the higher the amperage. You want to try to maintain 120 volts at full load with your generator. Some RV systems also have a type of power control panel that can shed loads(turn off items automatically) during periods that may exceed the capacity of the generator.

enblethen

Moses Lake, WA

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Posted: 08/21/21 10:42am Link  |  Quote  |  Print  |  Notify Moderator

Same voltage with or without AC is wrong!
Could be voltage regulator going bad.
Check with Flight Systems


Bud
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gssfc

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Posted: 08/21/21 12:57pm Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

Same voltage with or without AC is wrong!
Could be voltage regulator going bad.
Check with Flight Systems


Doesn’t governor on generator compensate for load and increase as needed. Seeing 120vac no load and 119.5 vac with both ac running. I say save voltage…to me that’s close enough!

enblethen

Moses Lake, WA

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Posted: 08/21/21 01:02pm Link  |  Quote  |  Print  |  Notify Moderator

Need exact model number of genset
Governor will do a little but your numbers do not sound right! What kind of volt meter are you using? Is it capable of reading frequency?

gssfc

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Posted: 08/21/21 02:58pm Link  |  Quote  |  Print  |  Notify Moderator

Onan 5500 HGJAB and my meter does not measure frequency. FWIW I have had it on and running both ac for last 5 hours no issues. Only difference is Chicago vs NH. Heat? Elevation is roughly the same…about 600 feet above sea level. No compensation for elevation made on generator. Set for sea level to 1000’.

enblethen

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Posted: 08/21/21 03:38pm Link  |  Quote  |  Print  |  Notify Moderator

You need to get a device that can read hertz and adjust governor to 62-63 hertz with no load. It should not be below 59.

cptqueeg

Idaho

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Posted: 08/21/21 05:04pm Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

You need to get a device that can read hertz and adjust governor to 62-63 hertz with no load. It should not be below 59.


Do you have a meter recommendation?

enblethen

Moses Lake, WA

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Posted: 08/21/21 06:03pm Link  |  Quote  |  Print  |  Notify Moderator

I wa trying to find one that I have plugged into receptacle in MH, but didn't find it. AE 20020 It is nice that I just leave it plugged in.
Found this at Amazon.
Meter
For your purpose the Klein would be etter then carry it with you.
or this one at Lowes
Lowes
Home depot has the Klien but more dollars.
No need to spend too many dollars. My Fluke is way to expensive!

rgatijnet1

Florida

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Posted: 08/21/21 06:09pm Link  |  Quote  |  Print  |  Notify Moderator

Here is an inexpensive meter to check voltage and frequency.
Kill-A-Watt

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