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Dual battery charging VSR vs 2nd lead?

Old 11-06-2019, 06:35 PM
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Default Dual battery charging VSR vs 2nd lead?

Mike - been having a discussion amongst a group of mates about charging dual batteries - lets confine the discussion to a boat with 1 engine and 2 batteries for the sake of clarity here.

Most of us run dual batteries, where 1 is dedicated to starting the engine, and the other has “house” duties with all lights, electronics, etc etc connected to it.

Most of us also run with a VSR battery management system. This of course has the advantage of charging both batteries as soon as the house battery reaches fully charged state, and it also means that electronics of all kinds are isolated from the voltage drops and potential spikes associated with engines being started.

So the question/discussion is

- how does the Suzuki aux charging wire work compared to the VSR battery management system?
- Does it provide any protection for the items running on the house battery from spikes?
- are there any advantages of the VSR battery management system vs the aux charging loom, or vice versa?

Your thoughts/comments welcomed!
Old 11-07-2019, 02:47 AM
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Sub'd. Have a DF300 with a Blue Seas ACR but have purchased the aux charging wire and was going to install that over the winter. Less wiring in the battery box = more room for sure.
Old 11-07-2019, 03:23 AM
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If you have a basic Perko switch 1-2-all you won't have any protection from voltage drops when starting the motor. I didn't have charging issues when I installed a blue seas add a battery kit but I was having electronics shutting down when starting. I have had years of trouble free operation with the current switch and would and have recommended the installation. I must have missed the bad batch of switches that were coming apart but I don't think that is an issue any more. Blue seas did fix the switch and were replacing the problem ones under warrantee.
If you already have a Blue seas ACR I don't see the point of installing an auxiliary charging wire, it would be redundant and could cause charging issues if used together.
Old 11-07-2019, 01:19 PM
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I was going to bag the ACR and just use the aux charge wire. The blue seas dual circuit plus switch can still be used. There is a diagram floating around here somewhere (THT) with a wiring diagram for this exact setup. Way less wiring involved and my batt boxes are getting pretty cramped as it is.
Old 11-08-2019, 05:21 PM
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Ok that sounds like it will work, keeps the circuits separate your just deleting the ACR.
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Old 11-09-2019, 02:56 PM
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Trash the ACR.
Old 11-11-2019, 04:30 AM
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With the motors built in charging isolator an acr is not really needed. On boats with house batteries I will hook up the isolator wire to charge them unless the boat already has an acr type system in them then I leave as is.
Old 11-13-2019, 05:13 PM
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Originally Posted by Outboard Specialties View Post
With the motors built in charging isolator an acr is not really needed. On boats with house batteries I will hook up the isolator wire to charge them unless the boat already has an acr type system in them then I leave as is.
Thanks Mike!

Are there any issues with spikes via the isolator wire?
Old 11-14-2019, 04:27 AM
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Originally Posted by Moonlighter475 View Post
Thanks Mike!

Are there any issues with spikes via the isolator wire?
Shouldn't be as the voltage is regulated via the rectifier.

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