Part No. 90-0113-00
Fdmman2.p65 2/98
To achieve 50% cycling you should cal-
culate your Amp-hour consumption between
charging cycles and use a battery bank with
twice that capacity**. Each AC appliance or
tool has a rating plate on it and will be rated in
either AC Amps or Watts or AC VA
(Volt-Amps) apparent power. To calculate
Amp-hour consumption, use one of the
formulas to the right to calculate the DC
Amp-hour draw for a 12 Volt system.
Calculate the Amp-hours for every AC
appliance or tool that will be operated on the
inverter. This will provide the total number of
Amp-hours used between recharges. Size the
battery bank using this number as a guideline.
A good rule to follow is to size the battery
bank a minimum of 2 times larger than the
total Amp-hour load requirement. Plan on
recharging when 50% discharged.
BATTERIES
(AC Amps x 10) x 1.1 x hours of
operation = DC Amp-hours
(Watts/ DC Voltage) x 1.1 x hours of
operation = DC Amp-hours
(AC VA/ DC Voltage) x 1.1 x hours of
operation = DC Amp-hours
DC Voltage is 12, 24 or 32 depending on
your system.
**Batteries are typically charged to 85% of full
charge when charging with alternators without 3-stage
regulators.
Typical Power Consumptlon
The chart below identifies typical power
consumption for common AC loads. Use it as
a guide when identifying your power
requirements.
Many electric motors have momentary
starting requirements well above their opera-
tional rating. Start up watts are
listed where appropriate.
Individual styles and brands of
appliances may vary.
If using the same battery
bank for the inverter and the DC
loads, be sure to consider the
power consumption of the DC
loads when sizing the battery
bank.
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In all formulas, 1.1 is the factor for
inverter efficiency.
11
AMP-HOUR CONSUMPTION FORMULAS
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