On 21/08/2010 10:49 AM, Brian on Harnser wrote:
> Bruce Napier wrote on 21/08/2010 :
>> 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.
>>
> With an electric fridge 4 hours every 24 is about right, as Bruce said
> the started would be very quick and the domestics well on the way after
> 2 hours but its the last bit that takes the time.
>
Hi,
Thanks everyone very helpful,
I notice most of you suggest the starting battery would be replenished
very quickly subject to it starting normally, is that the same with a
car, roughly how long does it generally take to replenish a battery
after starting ?
Thanks
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