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8. OPERATING TIPS
8.1 Rated Versus Actual Current Draw of Equipment
Most electrical tools, appliances and audio/ video equipments have labels that indicate the power
consumption in amps or watts. Be sure that the power consumption of the item you wish to operate is rated
within inverter wattage or less. (if the power consumption is rated in amps AC, simply multiply by the AC volts
to determine the wattage). The inverter (inverter mode) will shut down if it is overloaded. The overload must be
removed before the inverterrestarts. Resistive loads are the easiest for the inverter to run. However, larger resistive
loads, such as electric stoves or heaters, usually require more wattage than the inverter can deliver. lnductive
loads, such as TV’s and stereos, require more current to operate than do resistive loads of the same wattage
rating. lnduction motors, as well as sorne televisions, may require 2 to 6 times their wattage rating to start up. The
most demanding in the category are those that start under load, such as compressors and pumps. Testing is
the only definitive way to determine whether a specific load it can run. To restart the unit after shutdown due to
overloading, remove the overload if necessary, turn the power switch OFF then ON.
8.2.Power Tools and Microwave Ovens Won’t Start
Read the information panel on each power tool carefully to accurately determine the tool’s input wattage. The
output wattage is sufficient to operate most power tools and microwave ovens but remember that the power
needed to start the power tool may be as much a s 2 to 6 times of its continuous wattage required.
8.3.The AC output waveform of the inverter (inverter mode) is know as the “pure sinewave”.
Figure 1: Modified Sine Wave and Pure Sine Wave Comparison.
8.4.Battery’s Back up depends on the appliances which you will be used.
The batteries must provide between 10.5 and 15.5 volts DC (if 12V inverter) and must be able to supply the
necessary current to operare the load. The power source should be a well condltíon deep-cycle Lead-acid
battery. To obtaln a rough estimate of the current (in amperes) the power source must deliver, simply divide the
power consumption of the load (in watts AC) by 10.
Example:
if a load is rated at 100 watts AC, the power source must be able to deliver: 100/10 = 10A 0n larger
applications the power source may be several batteries connected in parallel. It is important to make sure
the cables have enough size. This manual does not describe all of the possible type of battery configurations,
battery charging configurations and bnttery isolation conflgurations.
8.5 Batlery Charger
We recommend you use deep cycle batteries. lf you hear the elerm of low voltage protection, please stopping
to use it, when it is fully charged, you can use it again. Please plug into the public power to charge for the
battery.
The battery operation time dapends on the battery capacity (Ah) and the loading power (Watt).
The method to calculate the operetion time is:
Battery capacity (Ah) x input voltage (Y)/ loading power (W)
Example:
Battery capacity = 150Ah
Input voltage = 12V
Loading power = 600W
(150Ah x 12V)/600W = 3H
