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Tractor Talk Discussion Board

Re: Battery charger/maintainer


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Posted by Geo-TH,In on January 17, 2017 at 15:41:13 from (172.78.64.237):

In Reply to: Battery charger/maintainer posted by Gene Davis (Ga.) on January 17, 2017 at 13:31:59:

Definitely a diode won't work. I have no clue if the alternator will let the smoke out of charger. If you want to find out, connect charger to your car and turn car on. If you see smoke, you just got your answer.

If I wanted to isolate charger without seeing it it smokes, i would use a current sensor and a relay to turn the power off to charger when there is current coming out of the generator.

GeneralAire Current Sensing Relays come in 120v or 24v models. It would be simple to use the 120v model and a 120v relay NC contact to power up charger when no current is coming from generator. When sensor detects current in generator wires, it will pull in the relay and turn off charger.

http://www.ebay.com/itm/GA51-120-Volt-GeneralAire-Current-Sensing-Relay-for-Apriliaire-Duct-Fans-51-/161880725009?hash=item25b0d7d611:g:93UAAOxyF19SE3ys

the GA50 GeneralAire is the 24vac model which you will need a 24vac relay and 24v transformer.

I've use both sensors, they work well for detecting AC current.
geo.


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