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How big is your charger? Mine keeps the battery full enough to start a 3.4 litre engine after a month or two of inactivity.
@Dammit what solar charger do you have?
I got a decent sized one but I think it was faulty as it seemed to make things worse. After finding the battery drain and ripping out the related stereo rubbish that was causing it, the car now starts after being left for 2 weeks on a Bosch S5 which I somehow managed to resuscitate despite letting it get down to low single figure voltages regularly.
However, doubt I'd get a month. If yours can do that I'm going and buying one straight away. Having said that I'm not really enjoying 996 ownership so it'll probably be sold in spring.
How big is your charger? Mine keeps the battery full enough to start a 3.4 litre engine after a month or two of inactivity. I think yours may be too small.