Jump to content
  • Announcements

    Welcome! New around here? Take a look at the New Members' Guide for some pointers.

    Not a member yet? Sign up here and you can soon be chatting away with friends old and new..

    Check out our Handy Information section if you're after something quickly!

  • If you would like to support the forum, please consider visiting the forum shop, where you can purchase such items as NBN Burgees, Window Stickers, or even a custom Limited Edition Wooden Throttle Control Knob

    Forum Shop

Recommended Posts

Hi folks,

I have 2 leisure batteries in the engine bay, 100ah things that are fine, but I'd like to increase the house bank side. I'd also like to fit a digital volt meter that doesn't suck as badly as the analog one I currently have on my dashboard.

So couple of questions.

My current batteries have post connectors and the usual stuff that goes with them, but a lot of the higher end batteries for 200ah etc are eye and bolt type connectors. Which brings me onto my second query, I bought a BM2 Battery Monitor that comes with a eye and bolt type shunt.

So, seeing how a lot of the higher capacity batteries use eyes, does it make sense to replace the current post connectors with eye types? and if so what should I know before embarking on this project?

Or should I find a shunt that works with post type connectors and replace the one they sent me with that and see how I get on?

IMG_20200205_094912.jpg

IMG_20200205_094957.jpg

Share this post


Link to post
Share on other sites

the type of connector should make no difference, just ensure the bolts are tightened properly as a loose connection is a source of heat and can deteriate to the point of failure (fire)

Share this post


Link to post
Share on other sites

I would mount the shunt on the bulkhead nearby not directly to the battery, have starter cable straight to battery and rest via shunt, you just need a cable to link.

Yours are just on eyes once you undo that butterfly nut.

Share this post


Link to post
Share on other sites

Hi Shunts shouldn't be connected to the battery terminals but in the cable. sorry but your connectors are all wrong you have no vaseline protection on connectors, suggest you remove all the cables and batt terminal wire brush all surfaces smear with vaseline and reconnect then cut off ends of cables smeared with vaseline then recrimped if unable to solder which is best, if possible bolt shunt on bulkhead and redirect cables to this then run one thick cable from shunt to battery smearing ends with vaseline on all surfaces, then when you replace/remove battery you won't damage/disturb cables. HAVE you no battery switch this ideally should be connected by cable from pos term then to switch then to starter and by seperate cable to shunt then on to fuses, it is good practise to have a inline fuze between battery and shunt after  any other take offs with the exception of starter. John

  • Like 1

Share this post


Link to post
Share on other sites

Thanks for the replies folks.

Sorry I should have possibly been a little more specific, I have no interest in connecting the shunt directly to the battery and it'll certainly be attached to the bulk head. The wiring is current in the condition I bought the boat in and I'm figuring stuff out as I go along.

I'm basically figuring out the best way to do the top half of this picture, bearing in mind that I also want to stick a larger Ah battery into the same spot or the spot on the other side which has pretty much the same wiring.

In the wiring diagram, it seems to show the load on the negative side directly on the shunt and the positive remains as is? But you folks are saying the starter should remain connected to the battery and the rest of the load wires removed and stuck onto the shunt and then the shunt connected to the negative terminal?

Cheers

Tom

Screenshot 2020-02-06 at 10.39.09.png

Share this post


Link to post
Share on other sites

Hi Tom Yes if you do it like that fine But in UK the pos usually goes to fuzes and switches not neg ( ie neg earth)not the other way round i guess you have a American wiring dia if the starter and alternator cables go to the pos batt terminal be very very careful to avoid cables touching at dash best to take everything from the one terminal ie in england the pos terminal with negative to earth, if all your wire terminals are as picture i recommend you replace all the crimped ends with new ones that are first dipped in vaseline then crimped , you will be getting high resistance if your other terminals are like ones in picture. John

Share this post


Link to post
Share on other sites

Hi Tom If you are going to have multible btterys they should be conected like this. John

img004.jpg

Share this post


Link to post
Share on other sites

Okay here's a full photo of the battery box for one of the batteries. Let me see if I can sum this up in a way we all agree?

Apparantly I need to stick some vaseline onto the connectors and clean them up, that is fair enough, I'm pretty sure I'm capable of that.

With regards to adding the shunt. Obviously it needs to be added to the negative side and attached to the bulkhead. So the consensus was that I leave the starter cable on the battery, remove the smaller cables and attach them to the shunt, and attach the shunt to the wingnut on the battery post connector?

Does that sum stuff up correctly?

Thanks

Tom

IMG_20200207_145431_1.jpg

Share this post


Link to post
Share on other sites

Is it one battery for domestic and one for engine start or two batteries in parallel that take care of both functions?

 

Share this post


Link to post
Share on other sites

It's manually switched by a  big old switch, which does have a both setting as well, so I generally use the other battery as the starter, then flip over to the one photographed above when moored up.

Both batteries are identical as I swapped them out when I got the boat, but thats all I've done with them so far. But I plan to double the Ah of the house bank later in the year.

Share this post


Link to post
Share on other sites

Why are you fitting the shunt on the neg side one usually fit the shunt on the live ie pos side? have you a american shunt? or does it say on the instruction to fit on neg side? if you run on the starter batt you won't charge the second batt unless the switch connects both then only domestic and then a all off, is that what you mean?. John

Share this post


Link to post
Share on other sites

Well the shunt instructions as you can see in the image a few posts ago show the shunt on the negative side. The battery monitor is made by a UK company, so I'm just doing what they say in the instructions.

There isn't a distinct starter battery, just a rotary switch with 1, 2 and both marked on it, so I, just out of choice more than anything use 1 as the starter, which isn't pictured, 2 as the house battery and don't ever run it on both... other than the first time I used the boat, ran the batteries down then couldn't start it again ;)

Share this post


Link to post
Share on other sites
9 hours ago, annv said:

Why are you fitting the shunt on the neg side one usually fit the shunt on the live ie pos side? have you a american shunt? or does it say on the instruction to fit on neg side? if you run on the starter batt you won't charge the second batt unless the switch connects both then only domestic and then a all off, is that what you mean?. John

The shunt for my Victron battery monitor is on the negative (as per the instructions)

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • NBN Mobile App

    Want to use NBN when you're out and about?

    Get our mobile app for Android and iOS!

    Get it on Google Play

×
×
  • Create New...

Important Information

For details of our Guidelines, please take a look at the Terms of Use here.