Product Manual
gpelectric.com | [page 23]
INSTALLATION
3.3.1 DC WIRING SIZING
The distance between the battery bank and the GP-ISW should be as short as possible to
achieve maximum efciency and to reduce re 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 10ft (3m) 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-ISW (Note: these
values are correct for cables in free air, not conduit)
Model Wire AWG Inline Fuse / Circuit Breaker
GP-ISW700-12 #6 F-110A
GP-ISW700-24 #10 F-110A
GP-ISW1000-12 #4 F-110A
GP-ISW1000-24 #8 F-110A
GP-ISW1500-12 #2 F-200A
GP-ISW1500-24 #6 F-200A
GP-ISW2000-12 #2/0 F-300A
GP-ISW2000-24 #4 F-200A
GP-ISW3000-12 #4/0 F-400A
GP-ISW3000-24 #2 F-300A
GP-ISW4000-24 #2/0 F-400A