Power Inverter Questions & Support

Find answers to frequently asked questions about Cobra power inverters — installation tips, safe operation, troubleshooting, and choosing the right model.

Output Voltage
The output from your inverter is a little different than the voltage from an outlet in your home. The voltage in your home is called a "sine wave"...
Why Does My Outlet Tester Show An Open Ground?
Outlet testers are intended for testing normal utility power (from your local electric company). With normal utility power, the neutral and ground are conne...
Radio Noise From Power Inverters
Power inverters can create radio noise, which is normal. If you experience a noise problem, here is what you can do to minimize interference:   Connect a...
Cables and fuses
Power inverters draw a lot of amps from the battery, as shown in the following table.  It is highly recommended to keep the battery cables as short as possi...