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Old 27-06-2016, 10:23   #16
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Re: Which Is The Most Power Savvy Relay?

Hi Isaac,
From what I've read here it seems as if you are most concerned about triggering an alarm when your system goes into an alarm state. For this purpose the most power savvy relay is possibly no relay at all. Think of the alternator light on your dashboard. The 'hot' side is wired to the ignition. The 'ground' side is connected to alternator output. When alternator output is plus, there is no alarm. When it goes to zero, there is a path to ground and the light is illuminated. (There is often a diode to prevent alt light from glowing faintly when output is higher than ignition voltage.) in my setup, the alt light 'ground' is connected to the regulator alarm terminal. In alarm state (not charging, overheating, etc.) i get a light, which also triggers a buzzer.
Of course your alarm circuit could include a relay which is not energized until the ground side gets grounded (hence zero power draw), but you might not even need one, depending on the power needs of your alarm. The diode might still be a good idea, but I don't have one unless it is internal to my regulator.
Make sense?

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Old 27-06-2016, 15:02   #17
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Re: Which Is The Most Power Savvy Relay?

Originally Posted by isaacchacon View Post
I am unsure about the resistance of the elk912...
You said it yourself: ELK912 : 0.030 amperes @ 12V

V=IR, so R=V/I = 12/0.030 = 400Ω

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Old 03-07-2016, 17:38   #18
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Posts: 525
Re: Which Is The Most Power Savvy Relay?

I've used a few of these:

Slim Line Industrial Control Power Relays for Sale at ICD

Spec'd at 850 ohms at 12V. Nice form factor that mounts to DIN rail.

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