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It will need to be about 0.1 Farad (100000uF) for a 1.5 sec hold time, or 0.15F (150000uF) for 2 secs.What do you consider large?
Do I need to precharge this value and if so what is the simplest circuit to use?
That's the question...
What switches the relay? The current will be very high to charge the cap if there is nothing to limit it.