Cobra Electronics CPI 2550 - Manual (Page 5)

5 Nothing Comes Close to a Cobra ® 4 English
Quick Evaluation
Introduction
Quick Evaluation
Introduction
Quick Evaluation Before Installation
•
This section provides you with basic information about
the inverter and how to check its performance before
installation.
Be sure to have on hand:
£ A 12 volt DC power source (such as a vehicle battery).
The power source must provide
between 11 and 15 volts DC and be
able to supply enough current to run
the test load. As a rough guide, divide
the wattage of the test load by 10 to
get the current (in amperes) the power
source must deliver.
£ A set of cables to connect the power source to the inverter
(not included).
The cables must be as short and thick as possible in order
to reduce the voltage drop between the power source and
the inverter when drawing current from
the power source.
If the cable suffers an excessive voltage drop, the inverter
may shut down when drawing higher currents because the
voltage at the inverter dropped below 10 volts.
#4 AWG stranded copper cable is recommended. It should
be no longer than four feet (one and one-half meters).
The end of the cable that connects to the inverter must have
its insulation stripped off for about one-half inch (one and
one-half cm) back from the end, exposing the bare copper.
The other end of the cable, which connects to the power
source, must be terminated with a lug or other connector that
provides a secure, low resistance connection.
For example, if the power source is a battery, the cable
must be terminated with a battery terminal that clamps to
the post on the battery.
£ A test load that can be plugged into the AC receptacle on the
inverter for short term testing at a low power level. The
following cables are recommended for testing low power
level test loads only.
Test Load Minimum
Power Cable Size
100W # 16 AWG copper
250W # 12 AWG copper
500W # 8 AWG copper
To check your inverter’s performance before installation:
1. Turn the inverter off (see page 14 for
details). If the power source is a DC
power supply, switch it off as well.
2. Connect cables to power input
terminals (see page 8 for details).
3. Connect cables to power source (see
page 8 for details).
4. Check to make sure all connections
are secure.
5. Turn the inverter on. If the
power source is a DC power supply,
switch it on first.
6. Plug in the test load.
The inverter should supply power
to the load. If the inverter is not
working properly, refer to the
troubleshooting guide on page 18
or power and protection indicators
section on page 16.
Power Supply
Test Load
On/Off Switch to Off
Connect Terminals
Connect Power Source
On/Off Switch to On
Connect Test Load