highland_brewer
Short Circuited Brewers
Assuming they really wanted you to use a pair for 3 vessel systems, the big oversight is the ability to interlock and not run both elements at the same time. To be honest, unless you have a pair of 30 amp circuits or a 50 amp circuit broken out into dual 30 amp outlets, you might as well just integrate a switch over step. Get an extra probe and just juggle the connectors.
The other option is to put a relay module onto the side, run the hots to both SSRs and then use a selector switch that just interrupts the "fire" signal to one of the SSRs at a time. If you get fancy about it, that selector switch can be double pole so that you can switch the probe signal as well as the SSR fire signal.
Yeah I have been thinking of something like that as well. I never have seen the need to do back to back batches so I would be ok with only running one heating element at a time. I did however install 6GA wire in the wall. All I would need to do is replace my GFCI breaker and add another plug..