Saturday, Jul 12, 2014 at 22:09
yeh ya realy dont get it do ya.
1. the alternator at 2000 rpm engine revs will probaly be capable of outputting about 75% of its rated output..so down arround 55 amps.
If its typical of diesel 4wds, 2000 rpm will be arround 80Kmh
2. as we have said the battery may not draw the full capacity of the charge source ever....more particularly it wont draw ist maximum unless it is at a low state of charge.
SO....depending on how the battery is used and the vehicle is driven...you may have been lucky to not have maximum alternator output and a low state of charge at the same time.
but if you go away on a trip where you
camp overnight..and mabe have a higher drain that in the past resulting in a los SOC and then get straight on the highway every morning...you may have a number of high current events.
events that would not occur if you did not have a high charge capacity and a low SOC at the same time.
NOW..if you have a DC to DC charger, that outputs a consistent higher charge voltage.....you may have a consistent higher voltage and charge capacity at low RPM.
Check the specs on the battery.
One thing that may save you is that sealed lead acid batteries AGM included when they get some age under them tend to have lower charge acceptance...this my reduce your charge current overall.
BUT..if you put a new battery in the same situation...you may find it does not last long.
serilusly..
check the specs on the battery.
cheers
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