Quote:
Originally Posted by Ormston
True about the heatsink although I would think it,s more likely the inrush current when trying to short out 110v.
The photo of the blown SSR shows a minimum of 24v DC so it could well be oscillating because as soon as the SSR closes the voltage would be well below 24v DC and switch off again.
This constant switching with very high inrush and poor heatsink can't be good.
As the SSR is easily capable of switching the load of the water heater, could you not just switch of the heaters when the tank is at temp?
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Since there is very little capacitance in the panels and the feed line,
there isn't really any in-rush current.. As the sun gets strong on the panel,
it goes from a few MA up to a max of about 8Amps.. That's it..
If there was a big in-rush, it would wipe out the semiconductor before
the heat sink would know it was starting to get warm..
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I don't want to switch the load of the heater. I want to short out the panels..
Unless someone tells me the AC SSRs are going melt at 8A..
