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Post by 100w30a question on May 3, 2015 11:53:41 GMT -8
Hey, I have a 100w 30a system hooked to a 35ah AGM battery. I want to have the power on during the day and off at night (that is right opposite of the typical photocell). What are my options? I can only think of adding a timer, but that is one more device that will rob power! Thanks.
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Post by jsb2000 on May 3, 2015 16:19:30 GMT -8
A quick solution would be to connect a relay to the load terminals and program the controller for dusk-to-dawn operation. At dusk, the relay would activate and break the connection from the batteries to the lights. At dawn, the relay would deactivate and connect the lights to the battery.
The only problem with this approach is that if the batteries get too low, the controller would de-energize the relay and the lights would come on...further draining the batteries!
A better solution would be to design a digital logic circuit with a solid-state switch that could handle the above scenario. Solid state would also save on power.
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Post by Admin on May 7, 2015 12:52:27 GMT -8
Thanks jsb2000!
As always your answers are great and informative.
100w30a, everything jsb2000 said is spot on and I am in agreement.
Renogy Tech Support
SR
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