Description
Run Your RV Air Conditioner on a Portable Generator
Tired of needing a massive 3500W+ generator just to start your RV's air conditioner? The iFJF Soft Start Kit reduces your A/C compressor's startup current by up to 70%, allowing you to run a 13,500 or 15,000 BTU rooftop unit on a compact 2,000-2,200W portable inverter generator. More power options, less noise, and cooler camping.
How Soft Start Technology Works
Traditional RV air conditioners draw 50-70 amps during compressor startup — that's 3-5 times their running current. This massive inrush spike trips smaller generators and shore power breakers. Our soft start uses microprocessor-controlled ramping to gradually bring the compressor up to speed, reducing peak inrush to a manageable 16-22 amps.
Compatibility
| Brand |
Models |
BTU |
| Coleman / Airxcel |
Mach 3, Mach 8, Mach 10, Mach 15, Polar Cub |
9,200-15,000 |
| Dometic |
Brisk Air II, Brisk II, Penguin II, Blizzard NXT |
13,500-15,000 |
| Atwood |
Air Command, AC-1351, AC-1501 |
13,500-15,000 |
| GE / Advent |
Standard rooftop A/C units |
13,500-15,000 |
Specifications
| Specification |
Detail |
| Input Voltage |
110-120V AC, 60Hz |
| Max Compressor Size |
Up to 16,000 BTU |
| Start Current Reduction |
60-70% (typical inrush drops from 55A to ~18A) |
| Generator Compatibility |
2,000W+ inverter generators (Honda EU2200i, Predator 2000, Yamaha EF2000iSv2) |
| Installation Time |
30-60 minutes — basic wiring skills required |
| Dimensions |
5.5" x 3.5" x 2.5" — compact for rooftop installation |
| Enclosure |
Weatherproof NEMA 3R rated housing |
Benefits — Why Install a Soft Start?
-
Run on a small generator — A 2,200W inverter generator can now power your A/C
-
Run two A/Cs on 30-amp shore power — No more choosing between front and rear A/C
-
Reduced compressor wear — Gentle startups extend compressor lifespan
-
Quieter operation — Smaller inverter generators are dramatically quieter
-
Lower generator cost — A $500 inverter generator vs a $3,000+ contractor generator
-
Boondocking freedom — Stay cool off-grid without upgrading your generator
Installation Overview
Installation requires basic 120V wiring knowledge. The soft start mounts inside your A/C's rooftop shroud and connects to the compressor run capacitor circuit. All necessary wiring, connectors, and detailed instructions are included. Most RV owners complete the install in under an hour using basic hand tools.
Frequently Asked Questions
Q: Will this let me run my 15,000 BTU A/C on a Honda EU2200i?
A: Yes. In testing, a 15,000 BTU Dometic Brisk Air II starts and runs reliably on a Honda EU2200i after installing our soft start. Make sure the generator is in good condition and not running at high altitude without adjustment.
Q: Can I install this myself?
A: Yes, if you're comfortable with basic 120V household wiring. The kit includes detailed instructions with photos. If you're unsure, any RV technician can install it in about 30 minutes.
Q: Does this work with older Coleman Mach units?
A: Yes. The soft start works with all Coleman Mach series units, including older models. The wiring connections are the same.
Q: Will this reduce my A/C's cooling performance?
A: No. The soft start only affects compressor startup. Once the compressor is running, it operates at full capacity with no reduction in cooling output.
Q: Can I run the A/C on a 15-amp household outlet after installing this?
A: Possibly — but it depends on what else is on the circuit. The soft start eliminates the startup surge, but a 15,000 BTU A/C still draws 12-14 amps while running. A dedicated 20-amp circuit is recommended.
