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Battery charging with 4- MPPT

I'm in the process of designing my RV 12V system. I will have:

  • 4 - 440W solar panels (Panels are on slides, 2 on top 100% exposure, 2 bottom only producing when deployed)
  • 4 - Smart Solar MPPT 100/30
  • CerboGX/Touch 50
  • 8-10 100Ah Lithium batteries. The plan is to connect each battery to 2 or 3 - Lynx PowerIN or possibly 5 - pairs in parallel if 10 are used.
  • 500A Smart Shunt.

What is the best way to monitor/control charging? Replace the Smart Shunt with a BMV-712 and 2 temperature sensors on 2 batteries or use one Smart Battery Sense?

Glen Carter asked
johanndo answered ·

2 Answers

SmartShunt has extreme voltage drift

I bought a SmartShunt 500, used, a few weeks ago and installed it last week. I tested it for about a minute with a plain lead-acid battery at the time of purchase, and it showed the expected voltage then (measured with known-good multimeter at the same time). After installing it in my boat, a simple 12 V system, it initially showed normal and reasonable voltages. But by the next morning, voltage was already up at almost 15 V, and it kept on climbing. By day two, it showed over 21 V, and later that day reached close to 27 V.

I completely disconnected the small solar panel (connected via a Victron PWM regulator) the second day, which changed nothing. All these readings were with the engine off (it's a sailboat) and with no shore power connected. So, the only source was the bank of lead-acid batteries, all at ~12.8 V, measured using two different Raymarine plotters, one analog volt meter on the instrument panel, and two different multimeters, all agreeing to within ~0.2 V or so. I measured with the multimeters across the battery minus connection on the shunt and the thin positive lead connected to the VBatt+ port on the SmartShunt, so exactly what the SmartShunt should be seeing.

Latest versions of the firmware available installed, according to the app.

I've tried leaving it unpowered for several minutes, to see if that reset it, but nothing changed. I've reset to defaults in the settings, but that obviously did nothing to the voltage reading.
The last thing I tried before I had to leave the boat was to remove it from the electrical system of the boat, and connecting it straight to a completely separate 12 V lead-acid battery. No other connections from the shunt or the battery. It still showed ~26 V.

The only thing I haven't tried is to switch it over to DC Meter mode, and back again. I don't have much faith in that helping, but it seems to me to be the only thing left to try, unless someone suggests otherwise here.

The boat, and the SmartShunt I forgot to bring with me from the boat, are unfortunately 2.5 hours away by car, so I won't be able to try new things with it until maybe Friday or Saturday.

Since I bought it used, I can't return it to a store, or make a warranty claim. My only hope is that someone here knows what the issue is and that it can be fixed. If not, well, I'll just have to accept that I bought a would-be dud.

swegel asked
swegel commented ·

2 Answers

Smart Shunt dual battery

I have conflicting technical information from Victron on the correct way to connect a DC Smart Shunt in dual battery system. I plan to use a VSR to link the batteries

Please see pics from Victron. I plan to use the aux input to monitor start battery voltage.

Which side of the DC shunt should the start battery negative terminal be connected?

I think this is correct with the starter battery connected to the smart shunt system negative.


This picture shows the starter battery negative is connected to the smart shunt battery negative.


mrlorin asked

0 Answers

SmartShunt reset SOC reset problem

I have Smart Shunt installed on my boat with Lithium SuperPack 25,6V battery for trolling motor use. All is working well when using the motor, but somehow Smart Shunt keeps resetting SOC to 100% after use. For example, yesterday after use SOC was 80% and today it showed 100% instead of the correct SOC 80%. What causes this automatic resetting to 100% after a while? Meanwhile there is no current drawn from the battery except what the SmartShunt itself draws nor it’s charged. I have disabled the Battery starts synchronized option (it’s OFF) and haven’t disconnected the shunt from the battery. I think I may have some option or setting incorrect, so what would be the ideal settings for the battery in question? All the help would be greatly appreciated, because the correct SOC reading is very important when out fishing so not to drain the battery completely.

ronster asked
friaras edited ·

3 Answers

Does anyone have settings for 24v Lifepo4 battery solar setup ?

Can I see your setup as some of the settings give very little information and no examples.
Here are my current settings:


spikemixture asked
nickdb answered ·

1 Answer

Shunt BT range

Has anyone found a gadget/booster/extender that can extend the BT range of the SmartShunt. I have mine connected to a Solar system in my carport and cannot even get to the house 10 feet away.

spikemixture asked
spikemixture commented ·

3 Answers

SmartShunt buzzing noise? Is this normal?

I just picked up a SmartShunt to act as a DC monitor since I already have a BMV712 for the main monitor. However upon installing it on my test bench, I found that there is a buzzing noise coming from the PCB. I did a quick search and found a few other users that reported this. Is this a common issue with these smartshunts? I'm mild OCD so I know when it's really quiet and I can hear it it'll drive me nuts. If I can get a warranty swap it might be worth it if it's not a common issue.


nebulight asked
nebulight answered ·

1 Answer

MultiPlus II 12/3000/120-50, 4 Smart Solar 100/30 MPPT, CerboGX and 800A LiFePO

I am building a RV system with:

  • 4-440W LG NeON R solar panels
  • 4- SmartSolar 100/30 MPPT into Lynx Power In w/fuses
  • 8-100A LiFePO batteries into 2-Lynx Power In w/fuses
  • Smart Shunt 500A
  • MultiPlus II 12/3000/120-50
  • CerboGX/Touch 50
  • Orion-Tr Smart 12/12-30A Non-isolated DC-DC charger

My main question is regarding connections to the CerboGX. The Smart Shunt and 4-SmartSolar = 5 VE.Direct. Does it make any difference which units are connected via USB-VE.Direct? The Solar panels are on slides and 2 are exposed at all times, the other 2, only when opened.

Is it best to put the 2 panels on slides on the USB to VE.Direct?

Glen Carter asked
wkirby answered ·

1 Answer

PUK code format for smart shunt

I am trying to reset the Bluetooth code. This is what's printed on the back of my Smartshunt:

E4 (circled) 10R-064694

I've tried entering all and parts of this, to no avail, always "wrong PUK code"

What part of this is the PUK? case-sensitive? dash included?

Paul Stafford asked
Paul Stafford answered ·

2 Answers

Consumed Ah trending down over weeks

A few months ago I swapped out my AGM batteries for LiFePO4, and set the initial battery settings to those recommended by the manufacturer and Victron. After a couple weeks, I left on a trip that got extended for a couple months. My rig was parked in the sun, with minimal loads, so the solar was hitting float quickly every day. But checking VRM, I noticed a trend where the Ah consumed (and therefore SOC calculations) were trending down never showing a full recharge.


My assumption is that this is an issue with calibration and SmartShunt settings, because the low voltage was not also trending down - never dropping below ~13.28V daily.


Would the community agree this is a SmartShunt settings "issue," and if so, which values would you recommend I try adjusting?


Thank you for any suggestions!

Follow up question for bonus points... :) What do most people do with LiFePO4 batteries when leaving for some time, while small loads will still need to access the power? I assume I'll hear some people concerned about keeping these batteries so close to 100% all the time?

Eric M. asked
kevgermany commented ·

2 Answers

Shunt cover

Hello, is there a cover available for the shunt so as to avoid any accidental short with the large exposed bolts of the shunt? Mine is mounted near 12v batteries as well as a positive bus terminal.


vansailor asked
vansailor answered ·

3 Answers

Where’s the puk

Where do find the PUK CODE on the SmartShunt? I see a SN, and a PN. On smartshunt.

denvail asked
Matthias Lange - DE answered ·

1 Answer

Clarity on BMV-712 connectivity parallel battery bank

Hello Everyone,

sorry if this question is somewhat amateur however could somebody please check my wiring intentions regarding BMV-712 Smart?

I have two 12 V | C20 | 200 Ah lead acid batteries connected in parallel via a busbar (cables of equal length to balance resistance).

If I've understood correctly, the shunt 'Battery -In' should connect to the negative busbar whilst B1 should connect to the positive busbar.

The battery capacity should be set to 400 Ah in the App.

If my understanding is correct B2 (Aux) can't be used to measure the Midpoint as my battery bank is 12 V; could however the temperature probe could be used to measure the batteries via the positive busbar?

Below is a sketch of my intended set-up.

Best regards


bazil asked
bazil answered ·

5 Answers

Where do I hook up the Red wire from the aux terminal to monitor mid point voltage on a 48v LiPo battery 8X12v in series parallel?

There are 4 batteries per bank hooked up with bussbars one positive and one negative, the shunt is in the negative side of the banks where do I connect the wire for midpoint voltage? The batteries are hooke up in series parallel in 2 banks of 4 each, they are joined by a positive and a negative bussbars and a cable from each bussbar pos and neg go to the all in one inverter. The shunt is in the negative side right before the negative bussbar, I understand that is supposed to go on the positive terminal closer to the negative bussbar? Or in other words from left to right left being the positive bussbar and right being the negative bussbar, the wire should go to battery number 4 on the positive terminal of that battery? What about the other battery bank? Will that work with the wire connected to just one battery on just one of the banks?


friaras asked
johanndo answered ·

3 Answers

Discharge floor generator autostart

When i set my discharge floor on 50%

And the geneator autostart stop on 0%- 100%.

Will the 0% actual be 50% or would i completly discharge my battery bank to 0%?

marc-heide asked
marc-heide answered ·

3 Answers


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