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The only way to know how much power is charged into and
withdrawn from a battery in an independent system, is to install an Amp hour
It works as follows : via a shunt all charge and discharge
current is measured in ampere per hour. Charge
current is added and discharge current subtracted.
Thus an accurate record of the amount of power into and drawn from the
batteries is displayed.
The amp hour counter is a must to check the efficiency of
batteries and power delivered by wind chargers and solar panels over time.
Even a new battery is only about 90 % efficient.
There will always be a positive balance on the counter.
Keep record of ampere balance before reset.
This a clear indication of battery efficiency.
A rule of thumb is to charge 120 Amp for every 100 amp hours
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