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Robert Upex
Robert Upex Posted on May 28, 2015
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Old Honda eb1500x is putting out low voltage but engine seems to run fine. Ideas for testing and fix?

Can anyone help with what should I check and how? First geni so not clued up on the terminology but am practical with my hands. Testing voltage at 230v socket started at circa 60v but after running for a bit had climbed to 70-75v. The 110v socket was low to, but can't recall the figure. Not sure I did it right, but checking hertz at the 230v socket was up at about 65h. Think it should be 50? It's a single phase geni and I can't see anything clearly wrong with wiring or such. Any ideas and explanation of which but your taking about & how tests should be done would be great. Thanks

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Eugene Rounds

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  • Honda Master 1,169 Answers
  • Posted on May 28, 2015
Eugene Rounds
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Couldn't find anything on that model number other a control box.

Assuming your in the USA output frequency would 60 hertz under load so 65 hertz would be find; although, engine is running close to 3900 rpm when it should be around 3750 rpm unloaded which would be 62.5 hertz. As the output voltage being low it is probably the AVR (automatic voltage regulator) that is the problem.

Testimonial: "Thanks Eugene. I'm in UK, should have mentioned that, sorry. The geni is old, prob from the 70/80's but was unused for first 20-30 years and then only used light for few years till recently. Thanks"

  • 3 more comments 
  • Robert Upex May 29, 2015

    Think I used the wrong button there, sorry

  • Eugene Rounds May 29, 2015

    Since your are in the UK then your normal power is 50HZ and the engine rpm would need to be around 3000 to get the 50hz.

    Is there a serial number that the model might be on as the number posted doesn't as generator on Honda's website?

  • Robert Upex May 29, 2015

    I haven't seen one, but will check again when in the garage next. It's an old geni, pre web, but can still get paper docs scanned online lol. And I found an epc pic of the control panel & switches via a local horns website, but no parts or anything listed.

    If the engine running too fast, thus the high hertz, this wouldn't reduce voltage would it? So perhaps 2 issues, low voltage and running to fast?

    How would I measure engine rpm? No tacho or anything to show engine rpm.

    Ignoring the high hertz, (assuming high hertz doesn't drop voltage) what could be causing a low voltage output?

    Thanks

  • Robert Upex May 29, 2015

    This is the control epc, it looks as near as darn it

  • Robert Upex Jun 03, 2015

    Nope, can't find a serial number on it at all, but frame has rusted somewhat. Anyone have any ideas please?

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