When I went solar with a whole RV inverter, I installed a soft start for the AC system. I taped the OEM unit next to it under the shroud in case it gave me problems and I needed to switch back. Now-6 years later and I have no complaints. I don't even notice any difference. I did it because with the OEM unit the surge would bog down the battery/inverter system and lock up the compressor and shut down. With the soft start, I can be off grid and start the AC and the compressor kicks on, no issues. With my old 4 lead acid RV batteries and solar panels I could run the AC about an hour, long enough to cool down a hot RV (sometimes while driving, so I get to the campground, hook up and have a cool RV). But the compressor cycles on/off and doesn't lock up. With my new 4 LiFePO batteries, I haven't stress tested it yet for duration comparison.
2012 FunFinder X 210UDS
4-68 watt flexible panels; 1-215 glass panel/4 Battle Born LiFePO4 Deep Cycle Batteries
2014 Ford F350 6.7 Liter PowerStroke V-8 Diesel longbed, SRW