Solar in car expert
I've had solar panels in my cars for 20 years.
In the Rover 75 I have fitted a glass monocrystaline 20Watt panel (£25). I installed this on the rear parcel shelf. In the engine bay lives a cheap PWM solar controller (£15). I use 5amp cable to connect everything.
Small panels are useless excepting on the very sunniest of days.
You must use a charge controller or you risk boiling! the car battery, acid gas will vent and corode your cars engine bay.
With my 20Watt panel I get all year round charging.
Battery never goes flat and always starts well even in winter.
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