I am not fully up on this currently. But, I added the spp6 (no "E") to my 13,5 AC. I chose that one after reading the voltage ratings and how it worked about the E on the manufacturers web site. It seemed to me you may never reach the proper voltage to open the capaicitor using the "E".
The one I added, made it easier to start with my 2400 genny.
Others swear by the "E". Sorry, I don't remember the ampeage readings and I no longer have that trailer. I also added a fan start time delay to shift the fan motor starting load.
