[page 20] | gpelectric.com
INSTALLATION
3.3.2 DC OVERCURRENT PROTECTION AND DC DISCONNECT
Batteries are capable of providing very large currents in case of a short circuit, if this occurs
with no DC overcurrent protection, it will result in overheating and melting of the cables and
possibly serious injury and/or fire.
DC overcurrent protection is not included with the GP-ISW Inverters. It must be installed
between the Inverter and battery bank for safety reasons and to comply with code regulations.
The fuse should be as close to the positive battery terminal as possible. Use Bussmann ANN
Class T series fuses (will also require Fuse Block 4164) or equivalent. Ideally, the fuse/circuit
breaker should be installed within 18” (45cm) of the battery. The fuse required for DC Cable
lengths up to 10ft is detailed in the above table.
In all installations a battery disconnect switch is required, if you install a circuit breaker for
overcurrent protection this will suffice as a disconnect switch. If you install a fuse for overcurrent
protection then a separate disconnect switch will need to be installed.
3.3.3 PREPARING THE DC CABLES
Go Power! supplies 2 ring lugs with the GP-ISW which can be used for the Inverter end of the
DC Cables. Source the correct ring terminals for the batteries you are using.
• Cut the negative and positive cables to the required length.
•
Strip off enough insulation so you can install the ring lugs provided.
• Use the correct crimp connector to install the ring lugs.
• Attach the connectors to both ends of both cables. Make sure no stray wire
strands protrude from the connectors.
3.3.4 DC CABLE CONNECTIONS
When installing the battery cable ring lug onto the GP-ISW DC terminal and the battery post -
do not put anything between the ring lug and the metal surface. Incorrectly installed hardware
causes a high resistance connection which could lead to poor Inverter/Charger performance
and may melt the cable and terminal connections. Tighten the terminal connections securely
(torque to 9 – 10 ft-lbs, 11.7 – 13 Nm) and periodically check the connections to make sure
they remain tight and secure.
