Power Bright ERP1100-12 - Manuel (Page 7)

D. High-Speed Cooling Fans. When the temperature inside the inverter
exceeds a preset limit, the Cooling Fan automatically turns on to cool the
inverter. When the temperature reduces, the fan turns off.
E. Negative Power Input Terminal.
F. Positive Power Input Terminal.
G. Ground Terminal
Determining the DC Power Requirements
Powering multiple appliances from the high-power ERP900-12, ERP1100-12
inverter requires a 12 volt battery. To calculate the approximate power in
amps a 12 volt battery bank has to supply you need to know the current, or
amps required for powering the continuous AC load. A shortcut method is to
divide the continuous AC load wattage by 10. For example, the continuous AC
load is 2000 watts. The current (amps) is: 2000/10 or 200 amps at 12 VDC.
Add to the load any DC appliances that may be powered by the battery bank.
Sizing the Battery
To determine the minimum battery bank ampere-hour rating that you
will need to operate appliances from the inverter, and any DC
appliances powered by the battery bank. Follow these steps:
1. List the maximum wattage that the inverter has to provide (as above).
2. Estimate the number of hours the appliances will be in use between
battery recharges. This will differ depending on appliances. As an
example, a typical home-use coffeemaker draws 500 watts during its
brew time of 5 minutes, it maintains the temperature of the pot at about
100 watts. Typical use of a microwave oven is only for a few minutes.
Some longer operating time appliances are lamps, TV's, computers and
refrigerator/freezers.
3. Determine the total watt-hours of energy needed. Then multiply the
average power consumption in watts by the number of hours of run time.
For example: 2000 watts for 10 hours = 20,000 watt hours.
Using the 2000 watts (or 200 Amps) for 10 hours example as above,
then 200 amps is needed for 10 hours. This provides us with the basic
amp-hours (AH) of battery that is required. Ten hours at 200 amps
equals 2000 Amp Hours (AH). This answer is just a beginning because
there are other conditions that determine actual run time. These include:
• AC appliance load and time in use (basic Amp Hour)
• Cable gauge and length