On 21 Aug 2010, at 09:41, Eno at Yahoo wrote:
> Has anyone any idea how long in general terms it will take a normal
> sized alternator (50 amp) to recharge two 110amp batteries, and
> recharge the starter battery back to its pre starting level assuming
> it
> was fully charged before starting the engine.
>
> I know there are a number of variables that would need to be known to
> give an accurate answer, but just for general everyday type use and
> using normal levels of power, example:- TV for 2 hours, 2/3 (20w)
> lights
> for 5 hours and the water pump and 12 volt compressor fridge.
>
> As a general guide how long would you think the engine would need to
> run
> to replace the energy lost.
As you say, this is rather a "How long is a piece of string?"
question, but the short answer is, quite a while. 50 A isn't much of
an alternator by today's standards, and I'd have thought somewhere
between 3 and 4 hours. Certainly long enough that the start battery
isn't an issue. Assuming the engine starts readily, the start battery
recharges very quickly.
If I'm wrong, I'm sure others will be along in a minute to correct me!
––
All the best
Bruce
You don't ever finish building a boat, you just make a start...
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