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Old 11-11-2023, 08:33 AM   #1
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Mounting Smart Shunt and Buss Bar.

Was thinking of ways to mount my Smart Shunt and Buss Bar in Airstream battery box, was going to drill holes and use self tapping screws but thought of a better way. Could have used double stick VHB tape but then when I have to remove batteries or for some other reason I'll have to pry them up. I ended up using Rare Earth Neodymium magnets screwed onto the feet of shunt and Buss bar. Magnets are One inch in diameter, CAD plated, 1/4" thick, used 8-32 Stainless steel flat head screws, locknuts and washers. Each magnet is rated to hold 29 lbs so once snapped in place it's not moving ! Will come off if I give it a yank though. Made cables long enough to move outside battery box while servicing.
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Old 11-11-2023, 08:58 AM   #2
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best to move lion inside
if you have a FB, then there is a lot of room under the bed for batteries and all the assorted electronics
that reduces tongue weight and and help with stability
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Old 11-11-2023, 09:03 AM   #3
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First dumb question of the day--I understand the uses for a shunt but is a busbar helpful for a single battery, non solar rig?
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Old 11-11-2023, 11:48 AM   #4
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No such thing as a dumb question, I was wondering if the magnets would interfere with the shunt ?
Im using deep cycle RV lead acid batteries for the time being, since dealer just installed them and are brand new.
When I do upgrade to lithium I will put them under the bed.
My rig is a 2021 GT 27FBQ with 370W solar on the roof.
Two deep cycle lead acid batteries
Victron 150/35 controller
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Old 11-11-2023, 12:28 PM   #5
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I am assuming that is the IP65 version of the Victron Smart Shunt.

Slick setup with magnets.

I would like to see a photo of the final install with all of the ground wires in place. Your choice of wire routing would be of interest.
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Old 11-11-2023, 03:27 PM   #6
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The Victron Smart Shunt is indeed the IP65 version.
I’ll post some pics once installation is complete
These magnets have incredible clamping force to the steel battery box.
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Old 11-11-2023, 10:58 PM   #7
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Quote:
Originally Posted by gamakai View Post
First dumb question of the day--I understand the uses for a shunt but is a busbar helpful for a single battery, non solar rig?
I find a bus bar helpful on any installation as it makes it possible to only have one positive and one negative lead going to your battery bank from the trailer's system. Much cleaner install and much easier to troubleshoot things down the line.

Also, you will inevitably expand or make changes down the road. Having a bus bar in place inside the trailer makes this much easier.
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Old 11-12-2023, 07:56 AM   #8
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The magnets will allow me to transfer everything inside once I upgrade to lithium, just unbolt the magnets and screw down to my backplane. No unnecessary holes in my battery box either.
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Old 11-12-2023, 04:03 PM   #9
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Here is finished product, Smart Shunt up and running.
Magnet mounts worked great. Buss bar cleaned up battery box wiring.
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Old 11-22-2023, 10:58 AM   #10
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Nice job!

Thats thinking outside the box, nice job.

Whats next on your list of upgrades (because we all know the list never ends).
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Old 11-22-2023, 02:05 PM   #11
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Quote:
Originally Posted by bzizzi View Post
Here is finished product, Smart Shunt up and running.
Magnet mounts worked great. Buss bar cleaned up battery box wiring.
Just wondering, it's hard to tell from the picture but are the batteries hooked up for balance? Maybe it doesn't matter much with lead-acid and two batteries, but this thread has a detailed discussion on balance which got my attention.
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Old 11-23-2023, 02:20 PM   #12
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Nice setup. What buss bar did you use? 3/8 or 5/16” studs? Thx
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Old 11-24-2023, 01:29 PM   #13
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I'll try to answer all the questions at once, so what's next ? Because Battle Born had a big Black Friday sale I ordered two GC2 heated 100ah lithium batteries so that upgrade is next. Yes, batteries are out of balance because doesn't matter with lead acid, (good Eye), for lithium I will hook up ground to one battery and positive to other battery as required.Last question, I used 5/16" Buss bars.
Once lithium batteries arrive I'll add positive buss bar and that'll really clean things up. I have to set my Victron MPPT to setting #7 and add jumper to WFCO charger for lithium, then I should be all set. I also added three more Zamp solar panels on the roof of Globetrotter to give me a total of 440 watts solar output on a really good day. So this should bring me more up to date for a while with Airstream.
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Old 11-24-2023, 11:39 PM   #14
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Quote:
Originally Posted by bzizzi View Post
I'll try to answer all the questions at once, so what's next ? Because Battle Born had a big Black Friday sale I ordered two GC2 heated 100ah lithium batteries so that upgrade is next. Yes, batteries are out of balance because doesn't matter with lead acid, (good Eye), for lithium I will hook up ground to one battery and positive to other battery as required.Last question, I used 5/16" Buss bars.
Once lithium batteries arrive I'll add positive buss bar and that'll really clean things up. I have to set my Victron MPPT to setting #7 and add jumper to WFCO charger for lithium, then I should be all set. I also added three more Zamp solar panels on the roof of Globetrotter to give me a total of 440 watts solar output on a really good day. So this should bring me more up to date for a while with Airstream.



I'm sure you checked, but the converter/charger in our '21-27'GT was not lithium compatible, so I had to replace it when putting in a couple BB's.


I'm curious as to your solar set up, how and where did you add panels? A couple of pics would be nice! We have the factory two panels and have a couple of 100a portables.
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Old 11-25-2023, 07:33 AM   #15
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I called Airstream, they pulled build sheet and schematics from my serial number, was told my 2021 GT was a late 2021 build and had the WFCO charger that was lithium compatible, just add jumper to up the voltage to 14.5V
I also called Zamp, told them what I had on roof from factory, they sold me what I needed and referred me to AM Soler for the no drill brackets using 3M VHB double sided tape, said I needed four brackets per panel, I used six for good measure.
I looked at WFCO in my GT and there is a set of contacts on back of unit marked lithium.
My Victron MPPT 150/35 solar controller is good for 500 watts
I hope this works ?
Airstrim is currently inside my building for the winter so no sunlight to test.
Sun isn't very high in the sky this time of year anyway.
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Old 11-25-2023, 11:22 AM   #16
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I've posted this many times, so people are probably tired of hearing it (ignore me). I replaced our stock 150|35 Blue solar with a Smart 100|30 (or maybe larger with your 440W) and sold the 150|35 on eBay for about the same price. The Smart uses VE.Smart Networking for more precise charging and you can keep the inside monitor while monitoring from your phone.
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Old 11-25-2023, 12:14 PM   #17
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So am I missing something ? Just went to the Victron site and Victron stated the main difference between Blue Solar and Smart solar controller is built in bluetooth on the Smart that enables the use of the both the app and internal Victron monitor. Both have Ve connect port. Mi Blue 150/35 does, I unhooked the internal meter and just use the app.
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Old 11-25-2023, 12:34 PM   #18
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Quote:
Originally Posted by bzizzi View Post
So am I missing something ? Just went to the Victron site and Victron stated the main difference between Blue Solar and Smart solar controller is built in bluetooth on the Smart that enables the use of the both the app and internal Victron monitor. Both have Ve connect port. Mi Blue 150/35 does, I unhooked the internal meter and just use the app.
(Edited)
It won't show up in the app unless you have the dongle (maybe you said that). I was thinking the dongle doesn't enable VE.Smart Networking implied from their compatibility table. Then I was reading further:

Quote:
There is a work around: connect a VE.Direct Bluetooth Smart dongle. This enables VE.Smart Networking support.
So, the benefit is only keeping your solar gauge with the Smart controller over the $50 dongle. I'll shut up.
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Old 11-25-2023, 03:46 PM   #19
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It's ok, you made me verify that I had the correct equipment, I did purchase the bluetooth dongle from Amazon, was on sale for $35. I still might make the switch over to the Smart 100 controller and use the 150/35 in my wood shop when I add solar for lights. I have deep cycle lead acid batteries already so I'm half way there, just need some panels on the roof.
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Old 11-29-2023, 06:28 AM   #20
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Install complete ! Now if I can only find the WFCO charger so I can install jumper for lithium batteries ? Victron MPPT was simple, moved dial from
2 to #7 position
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