Powercap whats a average farad

Quick question guys, whats the average decent farad. Im planning on installing 2 x 10inch subs and a 600w amp for some mild base to help drone out the exhaust, but as i have a very small micra battery to allow room for the fmic pipe work, im wanting to limit drain on the battery.

Hi mate power caps are like marmite some luv them some hate them I personally think there good I've got two and have very little space for bigger battery too .

I would get a 1 farad mate will do you fine takes up to 1000w so you should be fine just take extra care at fitting using the instructions well or won't get full protential out of the cap . Hope this helps feel free to quiz me