Xantrex Technology RS3000 - Manual (Page 97)

Troubleshooting
975-0170-01-01 4–17
Inverter Applications
The RS3000 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.
Problem Loads
Very Small Loads
If the power consumed by a device is less than the threshold of the Load
Sense mode circuitry, and load sense is enabled, the inverter will not run.
Most likely the solution will be to disable the Load Sense mode feature or
lower the sense threshold. Refer to Xantrex Tech Note TN3 (979-0003-
01-01) for more information.