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User’s Manual—Please read before using this equipment.
8
The curve can be applied to any lead acid battery under heavy load providing that the
battery has an AH rating “at the 20 hour rate”.
The example 50 amp load needs to run for 0 hours, so we begin configuration with a
500 AH battery. If the vertical is 500 and the horizontal is 50 amps, the percentage of
load on the battery is 0 percent. The curve shows that the 500 AH is derated to 90 % of
maximum. This means that the battery should be at least 6,500 AH for the full 0 hour run
time. It is important to add some extra battery capacity, because as batteries age, they lose
capacity.
ConFIgUrATIng The bATTery bAnK
6 volt, 220 AH deep-cycle “golf cart” batteries were selected for these illustrations because
they are generally available and relatively inexpensive. They are deep-cycle type and with
regular recharging they have a relatively long life. These batteries are “flooded” type; they
freely vent hydrogen and oxygen while under charge and heavy discharge conditions. They
must be vented to outside air to prevent accumulation of explosive gases. If batteries are to
be kept in close proximity to the inverter or in a living space, use deep-cycle sealed lead
acid batteries (SLA).
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