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.

What model of PowerTech?
And no, that voltage is not safe.

model IDL8000

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.

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.

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

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.

so you have your EMS wired in after the transfer switch?

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.

Are you sure it's not 14.3?

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...

Do you have a good, RMS volt meter? has it been checked?

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.

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.
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