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05-13-2018, 07:28 PM
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#1
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Senior Member
Join Date: Dec 2017
Posts: 245
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143v coming out of generator
In my DP I have an 8k diesel power tech generator. today I was trouble shooting my AC (bad fuse in thermostat) I discovered that my generator was outputting 143 volts. everything seems to be ok with that. lights, ac, microwave, fridge, central vac. Should I be concerned? is there some kind of voltage regulator that could have gone out and still allow the generator to function? the voltage is steady there is little to no fluctuation.
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97' Overland Ospery 4012, 42' long, 41,000 miles, 8.3 cummins, 6 speed allison, freightliner chassis, pulling a 24' enclosed trailer.
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05-13-2018, 07:34 PM
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#2
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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What model of PowerTech?
And no, that voltage is not safe.
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2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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05-13-2018, 07:39 PM
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#3
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Senior Member
Join Date: Dec 2017
Posts: 245
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Quote:
Originally Posted by Mr_D
What model of PowerTech?
And no, that voltage is not safe.
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model IDL8000
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97' Overland Ospery 4012, 42' long, 41,000 miles, 8.3 cummins, 6 speed allison, freightliner chassis, pulling a 24' enclosed trailer.
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05-13-2018, 08:15 PM
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#4
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Senior Member
Tiffin Owners Club
Join Date: Aug 2016
Location: Bastrop Texas
Posts: 1,343
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Something is amiss with the regulator that controls the RPM of Gen Set. Need to knowmore about the generator Make Model Serial # might be a easy fix if it is a spring system that can be regulated.
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2000 Allegro Bus 35R 3126 Cat 300 Allison 3060MD 6 speed
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05-13-2018, 08:18 PM
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#5
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Senior Member
Tiffin Owners Club
Join Date: Aug 2016
Location: Bastrop Texas
Posts: 1,343
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Something is amiss with the regulator that controls the RPM of Gen Set. Need to know more about the generator Make Model Serial # might be a easy fix if it is a spring system that can be regulated. Take the load off and then turn ac on and see what moves, that would lead you to the regulator system.
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2000 Allegro Bus 35R 3126 Cat 300 Allison 3060MD 6 speed
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05-13-2018, 08:25 PM
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#6
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Senior Member
Join Date: Sep 2012
Location: Tasmania now, USA/Canada/Alaska in April
Posts: 2,473
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You first need to check the voltage with ANOTHER meter before tearing stuff apart.
Some reasonable multimeters have a frequency option so that will tell you if the speed is too high.
THEN you can start chasing a cure
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Tony Lee - International Grey Nomad. Picasa Album - Travel Map
RVs. USA - Airstream Cutter; in Australia - MC8 40' DIY Coach conversion & OKA 4x4 MH; in Germany - Hobby Class C; in S America - F350 with 2500 10.6 Bigfoot camper
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05-13-2018, 08:59 PM
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#7
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Community Moderator
Join Date: Sep 2011
Location: Between the Oceans
Posts: 8,034
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143v is a little too high.
i have a powertech cd 8000 genset. about 2 years ago, i lost 120v ac although genset was running. i chased it down and found out that the genset output 140v and my ems cut it off to protect the entire electronics. i unplugged the voltage regulator, took a pic and sent to their tech support. "jeff", the tech, looked at the photo and told me instantly that thing went kaput. ordered a replacement from them for $240 (ouch!) all went well.
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Steven & Polly
2000 Country Coach Intrigue 40' ISC 350
2018 Ford Explorer 4WD
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05-14-2018, 03:41 AM
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#8
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Senior Member
Join Date: Dec 2017
Posts: 245
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Quote:
Originally Posted by CountryFit
143v is a little too high.
i have a powertech cd 8000 genset. about 2 years ago, i lost 120v ac although genset was running. i chased it down and found out that the genset output 140v and my ems cut it off to protect the entire electronics. i unplugged the voltage regulator, took a pic and sent to their tech support. "jeff", the tech, looked at the photo and told me instantly that thing went kaput. ordered a replacement from them for $240 (ouch!) all went well.
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so you have your EMS wired in after the transfer switch?
__________________
97' Overland Ospery 4012, 42' long, 41,000 miles, 8.3 cummins, 6 speed allison, freightliner chassis, pulling a 24' enclosed trailer.
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05-14-2018, 07:53 AM
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#9
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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I would not say it is the RPM regulator without checking frequency
Using a KILL-A-WATT meter plug it in and read voltage and frequency
If the frequency is more than about 62 HZ then adjust regulator
If the Frequency is 58-62 then you need to fix the voltage regulator
How to do that.... I do not know. not something I have ever done.
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Home is where I park it!
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05-14-2018, 08:54 AM
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#10
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Senior Member
Newmar Owners Club Holiday Rambler Owners Club
Join Date: Sep 2013
Location: Phoenix,Az
Posts: 527
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Are you sure it's not 14.3?
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2017 Newmar London Aire 4519 Freightliner Chassis
600/1950. 2023 Jeep Grand Cherokee Summit
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05-14-2018, 09:05 AM
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#11
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Community Moderator
Join Date: Sep 2011
Location: Between the Oceans
Posts: 8,034
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Quote:
Originally Posted by Shawn6596
so you have your EMS wired in after the transfer switch?
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yes i believe so. the factory installed progressive industry ems-hw50c hardwired is a gateway for shore and gen power on my coach. it defaults to 125v (i think). cd8000 genset typically outputs around 120-122v.
looks like you don't have an ems to safeguard the load devices, correct? with that high voltage it could really cause damages to them. i would fix it now.
to rule out other possibilities, (1) use another voltmeter to check; (2) plug into shore power and measure...
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Steven & Polly
2000 Country Coach Intrigue 40' ISC 350
2018 Ford Explorer 4WD
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05-14-2018, 09:19 AM
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#12
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Senior Member
Mid Atlantic Campers Forest River Owners Club
Join Date: Oct 2013
Posts: 185
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Do you have a good, RMS volt meter? has it been checked?
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2015 FR cedar creek , silverback 33IK
2015 chevy 3500HD
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05-14-2018, 09:31 AM
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#13
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Senior Member
Ford Super Duty Owner
Join Date: Dec 2009
Location: Mcdonough, Ga.
Posts: 5,932
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v The suggestion to use a second meter is right on. If you are really at 143 volts that is way to high. Max voltage with zero load is 131 volts.
__________________
1998 Pace Arrow 35 ft. F53 Ford V10 2014 Honda CRV toad
32 years mechanic at Delta Air Lines 15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.
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05-14-2018, 07:25 PM
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#14
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Senior Member
Join Date: Dec 2017
Posts: 245
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I have checked it with 3 different meters, one is nice craftsman digital with amp clamp, an old analog one that has always been true, and the third is a fluke. they all tested spot on from one and other, and read the shore power at 121. no EMS, I ordered a hard wired progressive. I am sure it is 143. if it were 14.3 then nothing would work.
I am leaning toward the voltage regulator. I am still doing some research. I will report back as things develop. thanks for all the input.
https://www.amazon.com/dp/B003AN1UA8...v_ov_lig_dp_it
__________________
97' Overland Ospery 4012, 42' long, 41,000 miles, 8.3 cummins, 6 speed allison, freightliner chassis, pulling a 24' enclosed trailer.
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