On 05/03/2016 05:42 AM, andy pugh wrote: it sounds like your derating should have been sufficient. The fact that an SSR with a SIZEABLE resistor in series with it failed is awfully suspicious! Are these name-brand SSRs or some china noname units you got on eBay? While the nonlinear nature of the load could cause some problems with turn-off of the SSRs, and the direct SSR could get damaged by surge if it ever got triggered in the wrong sequence, I can't imagine what could have caused the other relay (the slow charge one) to fail. So, it has to be either a voltage spike or the relays are actually total junk - like 120 V relays relabeled as 240 V units. I think you should get name brand relays and then put a series RC snubber across the "contacts".
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