Hello!Thank you for choosing Just Answer for the solution to your problem.My name is XXXXX XXXXX X am going to assist you with this.
There are several things that will cause a capacitor to blow.
The biggest reason is that it is the weakest link in the genset - they simply go bad.
Other things that will cause it are:
The set surging (not running smoothly - revving up and slowing down constantly)
Over loading the genset
A short in the windings of the set.
Bad diodes, if the set has any