Eliminate prejudice

All right, people, the moment of truth (for MY truth) has hit. Don’t worry, I don’t want to blame you or blame you for anything (whose?). It’s all about this: If a system with a little more watts is running with a switched off motor (i.e. only on battery), then the battery is empty quite quickly. A buddy of mine claims that with a PowerCap you can significantly extend the time that a system can run on battery (to several days, with enough Farad). So the caps work like a battery with enormous capacity. But here in the forum I read that a cap can only catch load peaks for a few milliseconds and then is empty like a blown-out Easter egg… So nothing of a long time that the plant can run on battery…. Could you help me separate nonsense and truth from each other? Would be really important to me! Thank you!!! merendo