Connecting Dc Input Wires - Eaton 12-110-1250y Operation And Installation Manual

Connecting DC input wires

CAUTION
Shock, fire and energy hazard - Proper polarity must be
observed here. Ensure positive is connected to positive, and
negative is connected to negative. Perform this observation
at the inverter and the battery. Reversing this connection will
damage the inverter and will invariably be detected by the
manufacturer and void warranty.
The procedure below will illustrate how to connect the
battery leads to the terminals on the DC side (back of the
inverter). Figure 8 shows the rear of the inverter. Keep
the cable lengths as short as possible. Also make sure the
cables are rated to a current at least equal to the rating of
the circuit breaker or fuse used in line with the cables. It is
important the cables are insulated to the correct voltage as
well.
Routing DC cables through an electrical distribution panel or
battery isolator will result in an undesired, additional voltage
drop.
Explosion or fire – DO NOT continue with the following steps if flammable materials or fumes are in the area. Battery dis-
connect/selector switch must be in OFF position or the following steps may result in explosion or fire. Proper ventilation is
crucial.
To make connections to DC terminals:
1. Ensure the inverter is OFF and no connections are being made to DC or AC circuits.
2. Remove nuts and washers from the DC terminals of the inverter.
3. Depending on the size of the connectors chosen, strip about ¾ inches of insulation from the cables. The connectors cho-
sen will need to create a permanent, low-resistance connection.
4. Attach terminals to both ends of cables. One end for the connection to the battery, and the other end for connection
to the inverter. Confirm no stray wires are left hanging out of the connector or terminal. Connectors should be crimped
properly to the cables using approved connectors and tools.
5. Installation of a fuse and fuse holder to the positive cable is required. The fuse must:
• Be placed on the positive cable and close to the battery
• Be rated for DC circuits 300A
• Exhibit an Ampere Interrupting Capacity (AIC) exceeding the short-circuit current available from the battery (Class T
fuse).
6. Turn the optional battery disconnect switch to OFF to avoid sparking when making connection. A spark upon initial DC
hook up is normal.
7 . Attach connector of positive cable to the positive DC terminal of the inverter.
8. Install flat washer then the lock washer and nut back on to the inverter. Tighten the nut to 2-13.6 Nm (9-10 ft lbs) . The
connection should be tight enough that the ring terminal does not move on the DC terminal.
A loose connection at any terminal may cause the wires to overheat and melt insulation, they will also cause an excessive
voltage drop.
Over-tightening any of the lugs and nuts may cause damage to the DC input terminals.
Eaton 1250W / 1500W / 1800W Inverter Operation and Installation Guide
Fire hazard - Proper wire must be used in all connections.
The temperature rating of the wire must be at least 75°C. All
connections must be snug, loose connections may overheat.
Figure 8. DC end
WARNING
CAUTION
IM SP180164 / Rev D
Connecting DC input wires
WARNING
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