On Tue, 30 Jan 2018 20:14:12 +0000, The Natural Philosopher wrote:

>> 12V, 20Ah. say 5V 140Ah. 2 months is 60 x 24 hours = 1440 hours
>
> that should be 12V,  70Ah...

That depends on the car. a little petrol "tin box on wheels" may only
have a 30 - 40 Ah battery. 2.5 l diesel > 100 Ah...

>> Its amazing what the Abilitry To Do Simple Sums can tell you when
faced
>> with handwavey statements like 'Keeping a pi running won't matter
to a
>> car battery.'

Also car batteries detest being deep discharged. Just one deep cycle
can significantly reduce their abilties, two or three is very likely
to kill it.

--
Cheers
Dave.

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