|I heard that if you use a stereo capacitor in a boat, they won't last very long because the boat is grounded only to the battery. Is this true?|
|I don't believe that would be supported by current electrical theory since the definition of ground means that you ultimately have to come back to the battery to complete the circuit.|
|Not sure, but that does not sound right. |
Why do you want to add a capacitor?
|Well the battery is grounded to the block. Which is of equal ground strength as anything in your car.|
|A capacitor is pretty worthless in a boat IMO.|
|It really depends on the wiring and the batteries. If your sub amp is trying to pull more than these systems are capable of delivering instantaneously then a cap will help. If not, then it is a waste of money. Many car wiring systems suffer from such deficiencies that's why they are popular in cars.|
|mine went out before I ever got to use the damn thing. Condensation formed one morning on it, and that was that.|
Since a capacitor only provides instantaneous reserves to meet peak transients, I've always considered it to be of some esoteric value only in systems where the voltage is good. In a boat where you're often running below an optimum voltage, especially when at rest, I don't see a real benefit.