Generator Capacitor 18UF +/-5% Dry-Cell Series

Generator Capacitor 18UF +/-5% Dry-Cell Series

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High specification Capacitor with Polypropylene (self-extinguishing) fire protection. Can be used as a 2 or 4 tab connection.

Generator Guru says: 

The Capacitor is essential to your Generator producing electricity. It is required to excite the Alternator windings and reduce voltage surges. Capacitors should last the lifetime of the generator, but can burn out if any of the following occur: 

  • Generator user has tried to draw more power than the Generator can produce.
  • A surge has happened on equipment and the capacitor has blown to protect the Alternator.
  • The Capacitor is made of Paper cells and the paper has degraded. (Usually pre 1998 generators.)
  • The Alternator has got damp and electricity has surged across the windings. (Dry out before running.) 

NOTE: Do not use this type of Generator with sensitive equipment (Computers, LCD TV, Caravan Charging systems and anything with a computer chip) unless you have an in-line "Surge Protector." These generators are designed to run power tools and the electricity output is not controlled. This can result in damaging your equipment.

*Compatible Part


4 Reviews

  • 5
    Great service and support

    Posted by A. Hessman on 22nd Jun 2018

    I have a very old generac generator that stopped producing electrical power. Researched on line and found Generator Guru. They responded to my inquiries on line, I viewed their troubleshooting videos and was able to diagnose my most likely problem I ordered a replacement capacitor, it arrived within about a week. Installed it and all is working well. I could not find the part in the States. Generac was no help. Recommend Generator Guru

  • 4
    Up and running

    Posted by Steven Carter on 23rd May 2018

    After I blew my existing capacitor, I installed this new one. My 15 year old generator is now producing power to the oem specs as if it were brand new.

  • 5
    What I Needed with Fast Service

    Posted by Dave on 13th Mar 2018

    After watching a video here I ordered one of these generator capacitors for my generator that was not delivering full power. Very fast service, ordered on a Thursday and had the part in hand Monday noon via FedEx. Easy replacement. Now the generator is back to life, full power to run my largest portable hand tools. Thanks Generator Guru!

  • 4
    My Excited Generator.

    Posted by J A Grubb on 29th Sep 2014

    After installing new capacitor to my dead generator it got all excited again and started to produce power again.

    Fantistic Service Generator Guru.