Battery to generator relay switch

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Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=83637
Printed Date: November 04, 2025 at 7:09 AM

Topic: Battery to generator relay switch

Posted By: jekel
Subject: Battery to generator relay switch
Date Posted: October 03, 2006 at 10:55 AM

Hello, I have been searching through the forums, but could not find the situation that I am trying to achieve...

I have 2 batteries running all of my components in an RV (1800 watts max) and I want to be able to switch to a generator when the batteries get low.

Is there a relay that will switch from the battery 12v source to the generator 12v source? (not sure if possible, but sounds good)

I'm thinking there will be a voltage drop for a brief moment, but will a capacitor help sustain when switched?

The relay will need to be rated for 150 amps.

Replies:

Posted By: bellsracer
Date Posted: October 03, 2006 at 5:22 PM

What generator do you have? Some generators and most newer generators now have sensors that will automatically kick on when voltages drop to a certain point. I would go to an RV specialty store and see what they have there. I'm sure that a product like that will show up in most of those stores.

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