Apologies for responding in English. Personally, I very seldom use the Air Conditioning, despite the fact it's converted to R-134a. With the top down, even when it's very hot (35-40C+) the wind cools you enough. Most of my lights are LED, except the headlights (H4H from Japan) and the stereo head unit is a new, power efficient Marine (Boat) unit that fits easily into the narrow Beat console. With the interior light switched completely off, there is little, if any, possible drain on the battery and the stock Beat alternator is a 60A unit, not a 50A one. And, if that doesn't work, I wind-up the key on my bonnet!