Right on the website. Read the last part of the bold print.
http://www.spyderrobotics.com/index....efbuevvtf8f5p6
Lol i'm stupid. I was reading the pass through unit which I thought was what you were using. I see you actually meant the big HP unit. Yeah, that is only rated to 12.5 amps so again, the Pelonis says 13.5 amps if I remember correct so that might be your problem. But if others are using the same Pelonis unit fine, I don't know. Yeah I'm pretty worthless on this topic haha.