gpelectric.com | [page 23]
INSTALLATION
3.3.1 DC WIRING SIZING
The distance between the battery bank and the GP-SW1500TS should be as short as possible
to achieve maximum efficiency and to reduce fire hazards. The size of the cable should be thick
enough to limit the voltage drop to less than 2% when carrying the maximum input current to
prevent frequent low-input voltage warnings and shutdown. Only use high quality copper wire.
The cables should be as short as possible and the overall length of both cables added together
should be less than 6ft (1.5m) to comply with code requirements. Keeping your wire runs as
short as possible helps to prevent: low voltage shutdowns and nuisance tripping of the DC
breaker because of increased current draw. The table below shows the recommended DC
cable size, fuses/circuit breakers and DC grounding cable sizes for the GP-SW1500TS (
Note:
these values are correct for cables in free air, not conduit)
Model
Wire AWG
Inline Fuse / Circuit Breaker
GP-SW1500TS-112
# 1
240 A
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-SW1500TS. 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
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 6ft 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.
