First, get rid of the capacitor. Second, none of us can predict the future. There are a wide multitude of factors that need to be considered; Your listening habits, music choice, system settings, the health of the current electrical system, type and severity of any problems if any do arise, etc etc. We can not troubleshoot a problem that does not yet exist. You need to first install all of the equipment and see how your current electrical system handles it once installed before adding or upgrading any additional electrical system components (batteries, etc). If you do have issues, you can report back with the type of problem you are having, the severity of the problem, and what circumstances the problem occurs in. From there we can assist you in troubleshooting. You may install it all and realize you have no problems with your current electrical system, which will do nothing but save you time and money compared to trying to troubleshoot a problem that doesn't yet exist.