could anyone tell me if i can wire the 12V battery to get around 20V out of the whole set? Right now it's wired in parallel which increases capacity but i need around 20V for the amplifier to have enough power (it can work on 12 but at 50% of volume). If i were to wire the battery in series to the charger's + or - that would fry it, right?
Chargers normally supply current pulses and thus would cause severe noise ripple in series with a battery and perhaps create havoc if the amp has some boost regulator.
What is the max voltage rating on the ojačevalnik (amp.)
Normally 12~14.2V is supplied to auto audio units with the Amp using a step-up voltage converter with a differential output drive to get max power at the lowest voltage.