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07-28-2009, 06:55 PM
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#1
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Senior Member
Join Date: Mar 2008
Posts: 222
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Inverter putting out too many volts?
Inside of my coach I have an Amp meter plugged so I can always keep man eye on the amps on my 110 outlets. The dial is always in the green zone (112 - 128) Amps. But the other day I was not hooked to shore, and when I flipped on the Inverter, The meter was reading 135 Amps.. is this something to worry about? VACMAN
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2008 Dutch Star 4354
Full Slide, Bath & 1/2
2008 Jeep 4 Dr Unlimited tow
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07-28-2009, 07:32 PM
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#2
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Senior Member
Newmar Owners Club Ford Super Duty Owner
Join Date: Jun 2009
Location: West Michigan
Posts: 920
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Vacman - Are you reading amps or volts? Most 110 volt outlets will read voltage in the range you describe. You would not read amperage unless you had something plugged in to that particular outlet and the reading you describe would be very high. Think we need more info.
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Dave 
2010 Canyon Star 3647
2010 Ford Escape
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07-28-2009, 07:55 PM
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#3
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Senior Member
Freightliner Owners Club
Join Date: Aug 2005
Location: Chicagoland
Posts: 715
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VACMAN, your meter is reading VOLTS ! 108-132 is ok---120 Volt AC is the preferred standard.
The 135 reading off the inverter is most likely ok also,because the meter is not able to read true RMS Voltage from the simulated sinewave that the inverter produces. 
Siggy D.
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Siggy & Ursula.
2011 Newmar DSDP 4020 , (No DEF, 07 emission),
FTL XCR Chassis , Cummins ISL 400 HP
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07-29-2009, 05:01 AM
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#4
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Senior Member
Join Date: Mar 2008
Posts: 222
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Quote:
Originally Posted by DandS
Vacman - Are you reading amps or volts? Most 110 volt outlets will read voltage in the range you describe. You would not read amperage unless you had something plugged in to that particular outlet and the reading you describe would be very high. Think we need more info.
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Opps,,My Bad,,How silly of me,, Volts not Amps,, My mind was saying Volts but my fingers typed Amps,, Anyway too late to change it now, so just read my post and where it says Amps, Just say Volts... 
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2008 Dutch Star 4354
Full Slide, Bath & 1/2
2008 Jeep 4 Dr Unlimited tow
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07-29-2009, 05:12 AM
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#5
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Administrator in Memoriam
Newmar Owners Club Retired Fire Service RVer's Spartan Chassis
Join Date: May 2000
Location: Newark, DE
Posts: 25,898
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135 volts is too high whether it's from the inverter, generator or shore power.
If your inverter is a modified sine wave unit, then a "True RMS" volt meter is required to obtain an accurate reading.
Using a NON True RMS volt meter will result in an inaccurate LOW voltage reading.
I believe some investigating is in order.
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Adios, Dirk - '84 Real Lite Truck Camper, '86 Wilderness Cimarron TT, previously 4 years as a fulltimer in a '07 DSDP
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07-29-2009, 05:54 AM
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#6
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Senior Member
Join Date: Mar 2008
Posts: 222
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What does RMS stand for? what does "TRUE RMS" volt meter mean ? If I shop for a meter should I look for one that says "TRUE RMS" ? 
__________________
2008 Dutch Star 4354
Full Slide, Bath & 1/2
2008 Jeep 4 Dr Unlimited tow
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07-29-2009, 06:56 AM
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#7
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Senior Member
Newmar Owners Club Ford Super Duty Owner
Join Date: Jun 2009
Location: West Michigan
Posts: 920
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__________________
Dave
2010 Canyon Star 3647
2010 Ford Escape
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07-29-2009, 08:08 AM
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#8
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Administrator in Memoriam
Newmar Owners Club Retired Fire Service RVer's Spartan Chassis
Join Date: May 2000
Location: Newark, DE
Posts: 25,898
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Dave's link offers some good info.
I suggest getting a True RMS volt meter to get accurate readings from modified sine wave inverters.
They're not too expensive. Sears, and Amazon.com are 2 places to shop.
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Adios, Dirk - '84 Real Lite Truck Camper, '86 Wilderness Cimarron TT, previously 4 years as a fulltimer in a '07 DSDP
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