Dual battery isolator- what voltage kick out?

Submitted: Tuesday, Jul 12, 2011 at 12:19
ThreadID: 87515 Views:2590 Replies:3 FollowUps:5
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Hi Guys

Just after some quick advice. I have a sidewinder db-120 isolator and it has served me well but i feel it may be getting tired, it is a few years old now and has had a hard life! The voltage kicks out at around 12.16v (tested this morning with multimeter) and basically kicks straight back in again. I tested this using 2 multimeters -one on continuty over the 2 isolator terminals, and the other multimeter on the main battery showing volts, read the batt voltage as the cont beep stopped. Using my headlights to draw power. When the lights were switched off, the isolator kicked back in straight away. The specs state it kicks out at 12.8v and kicks in at 13.2v and used to do this, but after a few flat batteries i decided to test it.
These results indicate that the isolator needs replacing.

I have done a search around at isolators, would like to replace it with the latest version of the sidewinder db140 but the specs seemed to have changed, the kick out voltage is now 12.4v? Do you think that is too low?
I liked the fact that the isolator kicked out at 12.8v, but am thinking 12.4 would be low, especially on cold mornings trying to start a diesel engine>
What do you guys recommend as being an ideal kick out voltage for an isolator?

i dont want to go a manual system, i want a fully automatic system.


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Reply By: Dave(NSW) - Tuesday, Jul 12, 2011 at 13:16

Tuesday, Jul 12, 2011 at 13:16
Why don't you get intouch with Derek

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AnswerID: 459731

Follow Up By: DOEY- Tuesday, Jul 12, 2011 at 13:23

Tuesday, Jul 12, 2011 at 13:23
H Dave
Thanks for your reply.

I am wanting to know what other members who have have dual battery systems think is a good kick out voltage. I know Derek is a member here, he may want to add his contribution.
To me 12.4v seems low, 12.8v seems better. But im no expert! Am quite happy to buy another sidewinder product, have bought quite a bit including a fridge etc of Derek, i know he is a helpful chap!
FollowupID: 733334

Follow Up By: Member - Bucky - Wednesday, Jul 13, 2011 at 05:19

Wednesday, Jul 13, 2011 at 05:19
Mine is 12.4 volts
Works fine

Got from Derek Bester at Sidewinder.com
FollowupID: 733410

Follow Up By: DOEY- Wednesday, Jul 13, 2011 at 07:24

Wednesday, Jul 13, 2011 at 07:24
thanks Bucky.
FollowupID: 733415

Reply By: snoopyone - Tuesday, Jul 12, 2011 at 13:29

Tuesday, Jul 12, 2011 at 13:29
I replaced mine with another Redarc which if I remember correctly does change at 12.8

AnswerID: 459733

Follow Up By: DOEY- Tuesday, Jul 12, 2011 at 20:04

Tuesday, Jul 12, 2011 at 20:04
thanks snoopyone. I had a look at the link, looks like it cuts out at 12.7v which sounds abit better. The only thing is the sidewinder fits perfectly where i need it. But the redarc might just keep a little more charge n the battery which will be better for those cold morning starts when a bit more grunt is needed.
I wonder why derek changed the isolators, might message him!

Have a good night.

FollowupID: 733387

Follow Up By: Polaris - Tuesday, Jul 12, 2011 at 20:26

Tuesday, Jul 12, 2011 at 20:26
Yup - the Redarc disconnects at 12.7V and connects at 13.2V
FollowupID: 733391

Reply By: DOEY- Tuesday, Jul 12, 2011 at 21:45

Tuesday, Jul 12, 2011 at 21:45
Well, i am much wiser now.

I have emailed Derek @ Sidewinder and he has explained the in's and out's of what i need to know and has made me a very happy man.

Vote 1 for Sidewinder.

Thanks mate

AnswerID: 459783

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