Victron Smart Shunt help needed.

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   I have a 2020 Hanse 315. I want to fit a smart shunt. My boat has two house batteries (both 160Ah AGMs), one under the starboard bunk and one under the port (which also houses the ACDC charger and an inverter). The wiring diagram that came with the manuals shows the battery amended to the correct 160Ah but only shows one. 

I'm assuming they're wired in parallel. I'm attaching a couple of images of the starboard configuration. There are three large black -ve cables attached to the -ve bus. 

The most forward on the busbar of these is straight off the -ve of that battery. It is labelled 've- service battery' at the battery end and labelled 've- busbar' at the bus end. According to the circuit diagram it should be 95 cable.  

The aft black cable on the busbar, of the same large diameter, comes into this electrical compartment from the aft end of it, alongside a +ve cable of the same diameter. The +ve cable which comes in with it attaches directly to the +ve on the battery

Then there is a slightly smaller diameter black cable attached to the centre of the -ve busbar which comes into the electrical compartment from about halfway long it, through a hole on the inboard side of it, and a similar diameter red +ve cable comes in with it. The +ve cable is labelled 'D1 ve+ charger relay'.  I cannot read the label on the -ve black cable except to be able to read 'D3'. The rest is obscured.

I'm assuming I need to insert the smart shunt between one of those last two mentioned -ve black cables and the -ve busbar itself but I can't see anything which would identify which of those two cables is the one I need to use. I'm hoping someone can help.  I have lots of photos but I won't put them all in here yet.

Many thanks

John

< ="moz-extension://bfac3862-9637-4d08-8f31-d30080ffce61/js/app.js" ="text/">

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
j_ohnno Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Joined: 10 May 2024 Location: Australia Status: Offline Points: 24	Post Options Post Reply Quote j_ohnno Report Post Thanks(0) Quote Reply Topic: Victron Smart Shunt help needed. Posted: 14 September 2024 at 10:36
	I have a 2020 Hanse 315. I want to fit a smart shunt. My boat has two house batteries (both 160Ah AGMs), one under the starboard bunk and one under the port (which also houses the ACDC charger and an inverter). The wiring diagram that came with the manuals shows the battery amended to the correct 160Ah but only shows one. I'm assuming they're wired in parallel. I'm attaching a couple of images of the starboard configuration. There are three large black -ve cables attached to the -ve bus. The most forward on the busbar of these is straight off the -ve of that battery. It is labelled 've- service battery' at the battery end and labelled 've- busbar' at the bus end. According to the circuit diagram it should be 95 cable. The aft black cable on the busbar, of the same large diameter, comes into this electrical compartment from the aft end of it, alongside a +ve cable of the same diameter. The +ve cable which comes in with it attaches directly to the +ve on the battery Then there is a slightly smaller diameter black cable attached to the centre of the -ve busbar which comes into the electrical compartment from about halfway long it, through a hole on the inboard side of it, and a similar diameter red +ve cable comes in with it. The +ve cable is labelled 'D1 ve+ charger relay'. I cannot read the label on the -ve black cable except to be able to read 'D3'. The rest is obscured. I'm assuming I need to insert the smart shunt between one of those last two mentioned -ve black cables and the -ve busbar itself but I can't see anything which would identify which of those two cables is the one I need to use. I'm hoping someone can help. I have lots of photos but I won't put them all in here yet. Many thanks John < ="moz-extension://bfac3862-9637-4d08-8f31-d30080ffce61/js/app.js" ="text/">

Arcadia Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 27 November 2017 Location: Sag Harbor, USA Status: Offline Points: 1112	Post Options Post Reply Quote Arcadia Report Post Thanks(0) Quote Reply Posted: 14 September 2024 at 14:35
	Ideally the two black V- cables from the batteries should go to one side of the shunt and the buss bar would go to the other side. This way all possible loads will be measured. Putting it after the buss bar may exclude loads that are grounded directly to the bar. Unless you are absolutely sure that the only cables on the buss bar are from the batteries and to your electrical service.
	Leon / ARCADIA 2018 Hanse 588 Sag Harbor, NY

32mike Members Profile Send Private Message Find Members Posts Add to Buddy List Commadore Joined: 26 March 2020 Location: FLorida, US Status: Offline Points: 453	Post Options Post Reply Quote 32mike Report Post Thanks(0) Quote Reply Posted: 14 September 2024 at 16:24
	Agree with Leon - both of the negative battery cables need to be connected to one side of the shunt and then the shunt connects from its other side to the negative busbar. It looks like the two cables on either end of the busbar are the cables from the battery, but don’t take my word for it! If you don’t feel confident in electrical matters, I would hire someone to do this for you. It won’t take them long and shouldn’t cost a fortune and you’ll have peace of mind knowing someone with the expertise did it right. I did that because I was new to the game. All of what you see in the pictures is factory installation except the shunt, which I had an electrician install. I’ve included a couple pictures from my setup with two 160ah batteries. In my case, the batteries are next to each other and in parallel, which they would have to be in a 12v system. They are parallel connected with busbars at the battery terminals, not via the busbar. Then the positive battery cable goes from one positive battery terminal to the battery switch and the negative battery cable goes from one negative battery terminal to the shunt. In the first pic, you can see the yellow cable from the shunt connecting to the busbar. The bottom of the two black cables at the top connects to the other side of the shunt - you can just see the edge of the lug in the picture and that cable is coming from one of the battery negative terminals. In the second pic, the shunt is at the bottom left. The black cable on the right of it comes from the battery terminal of one battery, which is also connected with another busbar to the other battery negative terminal. The yellow cable on the left of the shunt connects to the negative busbar of the DC system, which is just out of view. You can see the positive busbar on top. You can also see the busbar connection between the battery terminals. Hope this helps. Good luck.
	Mike S/V Dulces Sueños 458 #087 Tampa, FL

j_ohnno Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Joined: 10 May 2024 Location: Australia Status: Offline Points: 24	Post Options Post Reply Quote j_ohnno Report Post Thanks(0) Quote Reply Posted: 15 September 2024 at 00:22
	Thank you both for the very useful advice. Given the extra wires involved (eg the smaller diameter black cable attached to the battery -ve) I think as you say, there's too much uncertainty here for me to attempt it myself. I shall get a marine electrician to set it up for me and post back when installed. Also, the connectors on the ends of the battery cables are M8, the posts on the shunt are M10, so even swapping those over is not straightforward, not to mention the layout involved in getting the shunt into a good position for those connections.< ="moz-extension://bfac3862-9637-4d08-8f31-d30080ffce61/js/app.js" ="text/">

j_ohnno Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Joined: 10 May 2024 Location: Australia Status: Offline Points: 24	Post Options Post Reply Quote j_ohnno Report Post Thanks(0) Quote Reply Posted: 27 September 2024 at 12:14
	Again, thanks for the input. I took your advice and called in the marine electrician, and just as well. It turns out the inverter was wired directly off the port side house battery. So it needed to be wired across to the negative bus on the starboard side in order to get the shunt between the bus and the batteries. And of course it then took a good two hours or more to get a cable through the jam-packed cable run under the aft end of the raised cabin floor as no pull string had been left after they wired up the boat. Anyway all good now, and here's a pic of the completed installation just to close off the thread in case anyone was interested. I do have one last question. Next to the yellow switch to pull in the house batteries if the starter fails there's a black relay which I think the electrician said is set to prevent the alternator and or the mastervolt charger cutting in before the batteries reach a certain low voltage. Can anyone tell me what that voltage is and if indeed I have understood that relay correctly? Cheers< ="moz-extension://bfac3862-9637-4d08-8f31-d30080ffce61/js/app.js" ="text/">

Arcadia Members Profile Send Private Message Find Members Posts Add to Buddy List Admiral Joined: 27 November 2017 Location: Sag Harbor, USA Status: Offline Points: 1112	Post Options Post Reply Quote Arcadia Report Post Thanks(1) Quote Reply Posted: 27 September 2024 at 15:30
	That relay is a battery combiner. When it senses a charge voltage (13.5 or so), it will combine the house bank and the engine battery so as to charge both by either the alternator or the Mastervolt. When charging stops, it will isolate the two banks so that house loads only draw from the house bank.
	Leon / ARCADIA 2018 Hanse 588 Sag Harbor, NY



Welcome to myHanse.com the forum for Hanse Yachts owners throughout the world.