Owners Manual
SILENT RUNNER INVERTER/CHARGER POWER SYSTEM
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8
APPENDICES
8.1
Problem Loads
Although modified sine wave inverters will operate most AC loads, some loads may exhibit problems because the
wave form is different than the pure sine wave of utility power. This is due to the square wave components and that
the peak voltage is not quite as high as a pure sine wave. Loads that may exhibit problems include motor speed
controls found on ceiling fans and air conditioner fans; light dimmer controls; clocks; microwave ovens (cooking time
may vary and the clock may be erratic); video monitors and TVs (may have lines in the picture); AM radios (may
pick a noise); laser printers; copying machines; fluorescent lights; and power supplies in some electronic devices.
Rechargeable battery devices may also overheat and be damaged by the inverter. If you desire to operate a
rechargeable battery device on the inverter you should first power it up and closely observe it for a period of time to
ensure that it does not run too hot.
Ampere-Hour (A-H):
A unit of measure for a battery's electrical storage capacity, obtained by multiplying the discharge current in amperes
by the time in hours of discharge. The rating is usually for a discharge period of 20 hours and an end voltage of 10.5
volts. Example: A battery which delivers 5 amperes for 20 hours has a capacity of 100 A-H. 5 amperes x 20 hours =
100 Amp-Hr.)
The reason the A-H rating is misunderstood is simple. A battery that has a rating of 100 AH cannot always deliver
100 A-H. The underlying reason is the efficiency with which the battery converts its chemical energy into electric
energy. The A-H capacity of a battery is affected in the following ways:
Discharge Rate:
A battery becomes less efficient as the discharge current increases. For example, a typical 100 A-H
battery is specified to be able to deliver 5 amps for a period of 20 hours. If the discharge current
were increased to 25 amps, the capacity will be reduced to approximately 75 A-H (25 amps x 3
hours = 75 A-H).
Operating Temperature:
A battery becomes less efficient at lower temperatures. Most battery manufacturers specify the
battery A-H capacity at 80øF. At a temperature of 32øF, the same battery will have only about
65% of its rated capacity even though it may be fully charged. At a temperature of 0øF, a battery's
capacity will be reduced to about 40% of its rated capacity.
Battery Age:
As a battery is used, some of the active material on the battery plates will deteriorate and become
useless. As the battery gets older, there will be less and less useful material left on the plates and the
operating time will become noticeably shorter. A battery will age faster (loose active material from
its plates faster) if it is deeply discharged regularly, if it is left in a discharged state for extended
periods of time, or if it is repeatedly overcharged.
