Let’s see you go flat now Mr Battery!
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You do realise that you lose 60% output under a windscreen? So it's a 16w panel but that should be enough, even in northern latitudes. A 20/30w panel is sufficient for me.It’s a flexible 40w panel so weighs very little.
Is that with the panel connected? If so, you need a new battery!11.8v after one drive in the last two weeks since charging.
To what point? 250w is way more than required by the battery. Even for an EV, 1A is not very useful. Indeed the minimum charge rate for most EV's is 5A and that's with AC.You could always install a house solar roof panel on the roof of the A2 that way you get ¼ of a kilowatt of power
The glass is formulated to minimise heat gain in the summer and heat loss in the winter, hence the 60% loss.
Your car's battery will be the least of the garage's worries (in my experience) - until they get around to starting it. You needed a new one anyway! Deep discharging is usually fatal, it depends how long it was flat for.
RAB
This is useful for measuring battery drain:
Measurement down to 1mA. Just clamp around the +ve battery cable. No need to dis/re-connect anything. From memory, the normal battery drain is 40 to 50mA, so left for a couple of months, a battery might not have too much charge left, even without any unnormal drain.
RAB
Have you fitted a USB PSU perhaps? For phone/dash cam/etc? Unless they're on an ignition switched supply, they draw current even when no load is being drawn.At least I’ll be in the right place for a jump start.
I didn’t immediately note the parasitic drain at the beginning of the COVID outbreak. I went from 300 miles a week to pretty much nothing for a couple of months. Hesitant starting and some light dimming was my clue and a volt meter showed I think about 10.8 on the cigarette socket.
I hope it’s not irreparably damaged but I’m going to hold off replacing until I’m sure the parasitic drain is suitably countered by the panel.
Or I’ve managed to completely sort it (Timmus-Time maybe). I managed to lower the drain level but it’s still higher than I’d like...
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