On 12/02/2012 21:02, js.b1 wrote:

30mA sounds little but over 24hrs totals 8.64 watt at 12V. In overcast
winter your 10W panel may produce only 2W for a few hours a day. The
car windscreen reduces light, the angle of the panel and coverage
provided by the car reduces light further. So you might get just 4-5W
on the worst days which means a shortfall.


Eh? 30mA at 12v is 0.36 watts - whether for an hour or a week! Over a 24
hour period it is 8.64 watt-HOURS *not* watts.

So, assuming 30mA to be the drain, the question is whether or nor a 10w
panel can produce enough watts for enough hours to produce 8.64
watt-hours in a 24 hour period. If it could produce 2 watts for 5 hours,
that should be enough.
--
Cheers,
Roger
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