Three electrical jobs in one box
The Go Power GP-IC-3000-12 combines a 12 V inverter, a high-current battery charger and an automatic AC transfer switch.
In a camper this can simplify the AC system: the same unit can make 120 V power from the battery, charge the battery when shore power is available, and transfer supported circuits between sources.
3000 W continuous is the main inverter rating
Go Power publishes 3000 W continuous output. The manual also lists higher short surge ratings, including 4800 W for five seconds and 6000 W for about 200 ms.
These surge figures are intended for startup events. They do not mean a 6000 W appliance can be operated continuously.
Pure sine wave
The inverter output is pure sine wave, with 120 V AC / 60 Hz output in the North American design.
That is suitable for many sensitive electronics and motor loads, but the appliance still must fit within the continuous and startup limits.
The 12 V side carries very high current
The manual publishes up to 400 A maximum DC input current and recommends 4/0 AWG cabling with a 400 A Class T fuse for the GP-IC-3000 in the documented installation.
MHS explanation.These are serious currents. Cable length, terminal quality, battery BMS capability and fuse placement are safety-critical. A 3000 W inverter is not simply a large 120 V socket.
Charging from shore power
The charger section provides up to 125 A DC and uses a multi-stage charging process with temperature compensation through the remote battery sensor.
The correct charging settings still need to match the actual battery chemistry and manufacturer requirements. High charging current is not automatically appropriate for every battery bank.
Automatic transfer switch
The GP-IC-3000 includes a transfer arrangement rated at two 50 A legs, 120 V per leg, with up to 100 A total service capability in the documented design. Go Power lists a transfer time of about 16 ms.
This can simplify shore/inverter changeover, but the camper's breaker panel and branch circuits still need a proper electrical design.
Split-phase language can be confusing
The product page discusses two 50 A legs and 100 A shore service. That describes the AC pass-through architecture.
MHS explanation.The inverter itself is still a 120 V inverter, not a 240 V appliance source for arbitrary loads. Owners should understand which circuits are passed through and which are inverter-backed.
Efficiency and idle consumption
Peak inverter efficiency is around 90%. The manual lists about 25 W no-load consumption in normal mode and under 5 W in standby/sleep mode.
For long off-grid stops, leaving the inverter active has an energy cost even when no major appliance is running.
Battery size and runtime
A 3000 W AC load can demand hundreds of amps from a 12 V battery. A small battery may have enough stored energy for a short period but still be unable to safely supply the required current.
Battery capacity in amp-hours and maximum discharge current are separate limits. Both need checking.
Heat and installation
The unit is approximately 348 × 320 × 205 mm and 22.6 kg. The manufacturer specifies temperature limits and output derating at higher temperatures.
Provide ventilation and service access. A tightly closed cabinet can create heat problems and also make high-current terminals difficult to inspect.
What to check in a camper
Confirm the label GP-IC-3000-12. Check the Class T fuse, 4/0 cable run, battery-bank discharge capability, shore connection and which AC circuits use the transfer switch.
During handover, test a realistic high-power load from battery, then connect shore power and verify charging and transfer behaviour.
Key takeaway
GP-IC-3000-12 is a powerful 3-in-1 electrical unit. Its 3000 W inverter, 125 A charger and transfer switch can simplify a camper, but only when the battery, cabling, fusing and AC distribution are designed for the same power level.
Source
Go Power — IC Series 3000 W Inverter Charger
North American 12 V GP-IC-3000-12. High-current installation details must follow the applicable manual and camper electrical design.