Soft Start question

Are you taking the readings in the RV or at the service connection? A voltage drop is normal when operating a high current device like an A/C. How much it drops will be affected by the quality of connections (ie plug & receptacle), voltage, and wire size. A start assist device only reduces the the current spike of the compressor start.

I can’t say for certain, but I also have a Coleman Mach 1 P.S. with a ‘EasyStart’ soft-start, so a couple of observations:

First off, it’ll take several start and stop cycles for the soft-start ‘to learn’ how best to properly function…

Considering that the fan and compressor are starting-up and running simultaneously, 111v seems acceptable (108v is typically the lower design limit), and may have something to do with the power supply (especially summertime in a RV park!) or robustness of supply wiring, though I wouldn’t necessarily count this to be an item of primary concern - JMO…

On ours, I set the t-stat function switch so that the fan is on continuous LOW speed, while compressor has about a built-in 3 min start-up delay…This helps avoid the likelihood of concurrent dual motor starts, thereby reducing overall inductance (current surge)…

Hope this helps :)

3 tons

To prichardson: Yes, I am taking readings on the inside of my RV from a volt meter I have plugged into an outlet. It's not about the actual number but more about the amount of decrease in volts. Again I was expecting the fan to come on then the compressor but it seems like both are coming on at once. If it is only a 5 volt drop when both come on I'm assuming that is OK and the unit is doing what it is designed to do.

To 3 Tons: I will try your suggestions and give the unit some time to "learn" my A/C. the real test, and what I installed the unit for, is when I use my generator.

Nothing wrong with 111 The fact it's not going to like 105 or 100 means the soft start is working.

The fact it's drooping means the wiring (likely park side) is anemic.
The A/C draws around 13 amps running. that's what's drooping the voltage.
Normally it can draw a whole not more (And thus a much larger drop) Starting but the soft start is limiting that.

It takes 5 starts for the soft start to "learn". Do that on a GOOD power source.