6
Battery Selection
Select a battery or system of batteries that will provide your APS with proper DC voltage
and an adequate amp hour capacity.* Select ‘Deep-Cycle’ batteries to enjoy optimum
performance from your APS. Batteries of either Wet-Cell (vented) or Gel-Cell/Absorbed Glass
Mat (sealed) construction are ideal. 6 Volt “golf-cart,” Marine Deep-Cycle or 8D Deep-Cycle
batteries are also acceptable.**
* Even though APS models are high-efficiency converters of DC voltage, their rated output capacities are limited
by the amp-hour size of the external batteries. ** You must set Configuration DIP Switch #1, Group A (Battery
Type) to match the type of batteries you connect or your batteries may be degraded or damaged over an
extended period of time. See “Configuration,” page 5 for more information.)
1. Add the Wattage Ratings of your connected equipment to determine the Total Wattage
Required.*
2. Divide the Total Wattage Required (from Step 1) by the battery voltage to determine the
DC Amperes Required.
3. Multiply the DC Amperes Required (from Step 2) by the number of hours you estimate
will pass without AC power before your battery can be recharged to determine a Battery
Amp-Hours Required Rough Estimate.**
4. Compensate for inefficiency by multiplying your Battery Amp-Hour Required Rough
Estimate (from Step 3) by 1.2 to determine how many amp-hours of battery backup (from
one or several batteries) you should connect to your APS. Note that the Amp-Hour ratings
of batteries are usually given for a 20 hour discharge rate.Actual Amp-Hour capacities are
less when batteries are discharged at faster rates: batteries discharged in 55 minutes
provide only about 50% of their listed Amp-Hour ratings, while batteries discharged in 9
minutes provide as little as 30% of their Amp-Hour ratings.
* The wattage rating is usually stated in the equipment’s manuals or on their nameplates. If your equipment is rated in
amperes, convert to watts by multiplying the ampere rating by your nominal AC line voltage (120). ** Your charging
amps multiplied by the charging hours must exceed the discharge amp-hours taken from the batteries between charges or
you will eventually run down your battery bank.
Selecting Battery Type
Selecting Battery Amp Hour Capacity
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