Capacitor not keeping charge?

I running a 1 fared digital BOSS compacitor...I know BOSS is weak, however, the chrome model was mad cheap last year when I bought it...alittle bit of nail polish remover and all the logos were gone. haha

Anyways, I have had it unhooked for about 1/2 a year...still in my car, just decharged. Well I just re hooked up my amps...one power amp for my 2 audiobahn subs and another smaller visonik amp for my mids/highs up front.

When the cap finishes charging up the system works great, but after about 10-20 min BOTH amps stop working. They both loose power, and the status indicator on the cap shows it is trying to charge again. This is all while the car has been running too...

I just can't seem to figure it out...as the amps should still get power no matter if the cap is charged or not, since all the connectors go in/out on one + terminal...so the power from my battery should still be flowing through... ???

So far, the only thing I can think to cause it is that my new power amp has a 100amp fuse and I'm only running an 80amp MAXIfuse on my 4awg in the engine bay..with another 80 amp fuse in my distribution block before the capacitor. Could that cause a problem?

Thanks!

Doug

I am no expert by any means, but I think you might need to go to a second battery instead.  The caps are only good for short bass bursts.  The way it sounds another battery would be better.  This also means you will need a high output alternator.  i would think about getting one of these anyway because the stock alternator just cant charge everything quick enough.  This is just what I think and kinda have heard on these forums.