I’ve had a lovely time building a voltage and current meter; and have been amazed how much power we are feeding back into the grid (even near London in February) from our 2.4KW PV.
So I want to build a switch for the 3KW immersion heater. I’ve read the great article about pulse and burst mode.
Before I found that article I’d installed a SONOFF POW switch I flashed with Tasmota, which works great, and was planning on downgrading the heater to 1KW.
The SONOFF makes a clicking noise - I assume therefore it’s NOT an SSR, and will quickly die if I try using it for sub-second switching?
I’m looking at the cheap 40A SSR - but am not sure how to safely install them, into the airing cupboard, where kids go for warm towels and spare loo rolls. I believe the SSR could get quite hot so needs a heat-sink. My questions:
The connection screws look exposed - surely that’s not safe, or is the transparent plastic cover adequate?
I assume the heatsink needs air movement, so I can’t mount the whole thing in some form of box. Any suggestions?
Is it worth downgrading my immersion to 1KW to avoid too much SSR switching?
Many thanks for any help,