Your last generator Maintenance Run

[3930dave]

90 - I suspect what you are pondering is what looks to be Hour ratings, under different test Classes.

Bigger stuff ^ than the caps I used to work with (down into the detail-weeds @ times), so I don't know those Classes.

No promises, as it is the Holidaze @ moment, but I'll ping a retired buddy of mine, as there is a decent chance he is familiar with those Classes.....

Rgds, D.

P.S. Ducati ! I'm so used to seeing red !

90 - got an email back today, from my Power Electronics buddy..... (Thanks GC !).

"As far as I know, the "Classes" listed refer to the lifetime rating, lifetime ratings also happen to be listed on the capacitor (redundant info). Good info for an electric motor run capacitor.
Assuming that is a "run" capacitor, as the low cap. value suggests, lifetime would be critical as the cap is always passing current, generating heat and internal gas pressure - i.e. wearing out.
A start capacitor is usually a higher uF value."

Rgds, D.

 

[90cummins]

Thank you!
90cummins

 

[90cummins]

Brushless generators use capacitors for voltage regulation. All you need to do is match the uf and voltage class rating….. I’ve even used slightly different uf rated capacitors when exact replacements can’t be found, and they work fine…maybe a volt or 2 more output.

Does increasing the uf increase or decrease voltage output?
Good info

90cummins

 

[grsthegreat]

Increases voltage a bit as you increase uf, but that was when I only increased one from 78uf to 80uf. Not sure how healthy for gen though

 

[kenmbz]

Don't change the cap value too much, it goes on an inductive load.

 

[grsthegreat]

Don't change the cap value too much, it goes on an inductive load.

Agree, but they stopped making the 78uf required one for the generac 10kw brushless. I went with a 80uf out of necessity, and it worked out ok. Figured they have a 5% +/- rating anyways.