Pages: [1]   Go Down
Author Topic: Relay or Mosfet as switch.  (Read 622 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Newbie
*
Karma: 0
Posts: 21
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Hi,

Im not too sure what I'll need.

Ive added a second battery and alternator to my car. I want a relay to be turned on by the ignition, to switch on the charge/excite circuit of the alternator.

At the moment the excite circuit is coming straight off the ignition, with a charge light. But this is causing engine interference (a whistle) that disappears, if alternator number two is excited by battery number two directly. Thus the desire to have a switch/relay.




If you're not familiar with how alternators works. They need 12 volts to excite the electromagnet that produces power from the motion of the engine turning it.

Thank you
Logged

South Louisiana
Offline Offline
Full Member
***
Karma: 0
Posts: 178
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Why not just get a diode isolator and let one alternator charge both batteries?

http://www.victronenergy.com/battery-isolators-and-combiners/argo-diode-battery-isolators/
Logged

Offline Offline
Newbie
*
Karma: 0
Posts: 21
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Ive got everything fitted and wired up almost perfect. Im thinking of trying the kind of relay that are used for heat lights and putting the + through it.
Logged

Pages: [1]   Go Up
Jump to: