Xantrex Technology FREEDOM SW 3000 - Manual (Page 68)

54 Freedom SW 3000 Owner’s Guide
Troubleshooting
Inverter Applications
The Freedom SW 3000 performs differently depending on the AC loads
connected to it. If you are having problems with any of your loads, read this
section.
Resistive Loads
These are the loads that the inverter finds the simplest and most efficient to
drive. Voltage and current are in phase, which means they are in step with
one another. Resistive loads usually generate heat in order to accomplish
their tasks. Toasters, coffee pots, and incandescent lights are typical
resistive loads. It is usually impractical to run larger resistive loads—such
as electric stove and water heaters—from an inverter due to their high
current requirements. Even though the inverter may be able to
accommodate the load, the size of battery bank required would be
impractical if the load is to be run for long periods.
Motor Loads
Induction motors (motors without brushes) require two to six times their
running current on start up. The most demanding are those that start under
load (for example, compressors and pumps). Of the capacitor start motors
(typical in drill presses, band saws for example), the largest you can expect
to run is 1 hp. Universal motors are generally easier to start. Since motor
characteristics vary, only testing will determine whether a specific load can
be started and how long it can be run.
If a motor fails to start within a few seconds or loses power after running for
a time, it should be turned off. When the inverter attempts to start a load that
is greater than it can handle, the inverter will turn itself off after a few
seconds.