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User’s Manual—Read before using this equipment
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The curve can be applied to any lead acid battery under load providing that it has an AH rating
at the 20 hour rate.
Continuing with the previous example, the 150 amp load will need to run for 10 hours, so we
begin configuration with a 1,500 AH battery. If the vertical is 1,500 and the horizontal is 150
amps, the percentage of load on the battery is 10%. The curve shows that the 1,500 AH is
derated to 90% of maximum. This means that the battery will have to be 1,650 AH for the full 10
hour run time. It is important to add some extra battery capacity, because as the batteries age
they will lose AH capacity.
CONFIGURING THE BATTERY BANK
Twelve-volt, 220 AH batteries were selected for these illustrations because they are generally
readily 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 charging and heavy discharge. They must be vented to
outside air to prevent accumulation of explosive gases. If the batteries are to be kept in close
proximity to the inverter or in a living space, use deep-cycle sealed lead acid (SLA) batteries.
Fusing Requirements
NOTE: It is important that this 5,000 watt inverter has the correct main battery fuse added to the
Positive (+) battery cable as close as possible to the battery bank’s positive terminal. ANL fuse
must be located within one foot of positive battery terminal, marine installations within 8 inches.
Refer to this chart for correct size:
#3744 (12V DC INPUT)
#3744-4 (24V DC INPUT)
#3744-8 (48V DC INPUT)
ANL 500 amp fuse
ANL 250 amp fuse
ANL 125 amp fuse
The fuse amperage rating must be sized to allow simultaneous operation of all the AC appliances
to be powered, allowing for the momentary high startup current requirements of inductive loads.
Use the recommended fuse block (fuse holder) and fuse, or an electrical equivalent. ANL type
fuses and fuse holders are readily available from marine supply dealers.
The fuses are very important to protect equipment, batteries and personnel. The fuses protect
against battery explosion if the cables that connect to the inverter accidentally short.
