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i like it. I could use something like this.Get one of those cheapo solar powered garden lights, and strip the batteries out.Wire the charging curcuit to a 1.5v relay.When it's daylight, the solar panel will kick out 1.5v, which in turn will power the relay.Thus turning my heater on.Might be a project for next year if such a thing as a 1.5v relay exists.
If you can find a 3 volt relay, you can wire a switchup with a large electrolytic capacitor and threediodes. When you click the switch 'off', itcharges the capacitor to about 1.5 volts. When you click the switch back 'on', the cap gets put in serieswith the power supply, creating a temporary +3 voltsto make the relay 'pull in'. Once the relay pulls in,the holding voltage (and current) will be much lowerand will probably stay on even at 1.5 volts untill theswitch is again turned off. Once turned off again,the cap charges up again, ready for the next turn on cycle.