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Aha, that's actually surprisingly high, but I guess there is some overhead, and that the real number is a tad lower. 72 Watts sounds a bit harsh. Thank you so very much for the answer :)

Nice work - really looking forward to follow the updates! One question regarding the 12V SSB heat pads - how many amps do they draw?

Aha, right. But shouldn't the current be stepped down a bit? As the SSR is controlled with 3-32V input? Or could i just power the SSR with the "normal" output from the relays on the STC, and use the switching PSU between the SSR and the 12V pump? (feeling n00b)

Aha! Oh well, I'll check it out when those long awaited Swithing PSU adapters arrives from China. So a 12V 8W pump is too hot to handle? Hehe, I'm not exactly an electrician, but I thought that it could do that, given the current to the terminals are about 14V. Cheers for great work, alpha!

So, I also thought I'd have a go at this sweet thingy. Flashed the firmware and then stumbled upon the wiki article on how to get the terminals to feed 12V instead of 240V, by desoldering the relays and bridge the connections as shown in the illustration photo. To test it, I wired it up and...