Aux battery with relay?

Luke Duke · 06-10-2016, 03:15 PM

Has anyone ever wired up an aux 12V battery with a relay so that some things will be turned off with the key switch? Is a relay even necessary? How much current can a stock key switch handle? I want my light bar/headlights/tail lights/horn to shut off with the key and I want the (future) stereo to stay on.

Would this work?

Amazon

Also what chargers do you guys use?
This one looks like it would work well. I'm liking the dashmount adapter. It makes it easy to plug in and also has a battery life indicator.

Amazon

Sergio · 06-10-2016, 03:50 PM

The Relay coil needs to match your pack voltage, it will only draw about 0.02Amps from the key switch:

Link to 48v 30 amps Normally Open contacts relay

You also need a flyback diode in parallel with the relay coil, the cathode (end with a stripe) goes towards the positive activation wire.

Link to 1N4007 diode

Wire the relay coil to the key switch like this:

http://www.buggiesgonewild.com/attac...ux_battery.jpg

That NOCO charger should work fine.

Luke Duke · 06-15-2016, 12:21 PM

Thank you for the information. I'm in the process of getting the parts ordered. What are others using to hold down the battery? Unfortunately a box won't work since there would be no room to take the battery in/out. Is something like this my only choice?

Amazon

06-10-2016, 03:15 PM	#1
Luke Duke Getting Wild Join Date: May 2014 Posts: 84	Aux battery with relay? Has anyone ever wired up an aux 12V battery with a relay so that some things will be turned off with the key switch? Is a relay even necessary? How much current can a stock key switch handle? I want my light bar/headlights/tail lights/horn to shut off with the key and I want the (future) stereo to stay on. Would this work? Amazon Amazon Also what chargers do you guys use? This one looks like it would work well. I'm liking the dashmount adapter. It makes it easy to plug in and also has a battery life indicator. Amazon Amazon Amazon Amazon
Luke Duke Getting Wild Join Date: May 2014 Posts: 84

06-10-2016, 03:50 PM	#2
Sergio Gone Wild Join Date: Sep 2012 Location: Charlotte, NC Posts: 9,329	Re: Aux battery with relay? The Relay coil needs to match your pack voltage, it will only draw about 0.02Amps from the key switch: Link to 48v 30 amps Normally Open contacts relay You also need a flyback diode in parallel with the relay coil, the cathode (end with a stripe) goes towards the positive activation wire. Link to 1N4007 diode Wire the relay coil to the key switch like this: http://www.buggiesgonewild.com/attac...ux_battery.jpg That NOCO charger should work fine.

06-15-2016, 12:21 PM	#3
Luke Duke Getting Wild Join Date: May 2014 Posts: 84	Re: Aux battery with relay? Thank you for the information. I'm in the process of getting the parts ordered. What are others using to hold down the battery? Unfortunately a box won't work since there would be no room to take the battery in/out. Is something like this my only choice? Amazon Amazon Amazon Amazon
Luke Duke Getting Wild Join Date: May 2014 Posts: 84

Similar Threads
Thread	Forum
500 amp Battery Isolator and Relay	Electric EZGO
Need help hooking up a relay bypass in a club car battery charger	Electric Club Car
Bad Relay?	Electric Yamaha
looking for relay	Gas Yamaha
16v on 12v car relay	Extreme DC!

Today
BGW	Sponsored Links __________________ This advertising will not be shown in this way to registered members. Register your free account today and become a member on Buggies Gone Wild Golf Cart Forum