Ive been trying to figure out why the heck my 5500w legs were sticking on after a few seconds of 100% on. After some DMM testing and talking with my electrical engineer buddy i decided to look at the recent reviews. Seems like these amico 40a modules are bogus when you put a 20+ amp load on them. The 40A relays worked fine on the 3500w leg and the 20A amico's work great for the 3500w as well. I would actually recommend the 20A Amicos. Just dont buy the 40w ones. Also as mentioned in the reviews be sure to apply thermal paste between the heatsink and SSR's and dont be a dumbass like me and buy the two tube thermal epoxy.
Knock on wood - I just installed a pair of 40 amp modules but will only be running them at 13 amps (1500 watts). They were a buck more than the 20 amp ones and I figured no sense in pushing a smaller one.
I just created an amazon return, i had to contact them via chat but they will refund beyond the 30 day policy. Just explain how this is a fire and electrocution hazard and they don’t operate as described.