After 2 months of none top balancing the calculated SOC of mine lynx shunt 1000 is 10% off.
Got a low battery alarm this morning but SOC still showed 10%.
What is the correct procedure to adjust efficiency and peukert to correct it?
I’m using LFP cells.
Are you saying you haven’t hit full charge in 2 months? I would say 10% drift in that case isn’t too bad.
Winter time and a quite big battery.
Would expect less drift than 10%, this is around 200Ah error.
Mine jK bms is even better than the shunt and we know how bad they are 
Here’s my LynxShunt settings for what they’re worth. Notice the charged voltage is fairly low thats because sun has basically been missing for entire month, for my sccs I’ll absorb at 55.2V for one hour then float at 54.4V. All kinds of random batteries attached.
I should add, I have a mix of SCCs, two 150/35s a 250/100 and a 450/100. Charger efficiency drops in that order, when you graph pv watts versus battery watts.
None DC consumers or production, so all current goes through the shunt.
Current threshold was 0.01A, do see I now can adjust it to 0.00A, efficiency is also 99%, Peukert I have 1.00.
Voltage is calibrated (fluke 287) and also 0 current is set.
Should I increase Peukert a little?
I’d prob drop your efficiency to 98% see how that goes. I guess it doesnt really matter which lever you adjust to match reality.
Changed Peukert from 1.00 to 1.01 and SOC jumped from 17% now to 21%, think that is the wrong way.
Change to 98% lets see, hope that I can top balance soon.
But none wind and low prices here in the Netherlands 
Use a BMV or SmartShunt and you won’t have this problem. Use a Lynx Shunt and no amount of tinkering with Peukert exponents or charge efficiency will help. All you will do is move the inaccuracy to the top of the charge or the bottom of the charge. I spent a WEEK in October testing the Lynx Shunt because I realized it was wildly inaccurate. It’s an ok battery monitor if you can fully absorb batteries often, but if not, it’ll drift like styrofoam on the ocean. Within four battery cycles of what should be 20%-90% SoC the Lynx shunt had deviated from the SmartShunt and battery BMS (a good one) by as much as 30%. The SmartShunt and BMS we within 2% of each other. I purposely didn’t full charge the batteries so the Lynx Shunt wouldn’t resynchronize each time.
I have since realized that two other installations where we installed Lynx Shunts were having similar issues. The Lynx Shunt SOC would eventually read 80% SoC when the batteries went in to low-voltage disconnect at a bit under 48V. Around the end of October both systems stopped fully charging the batteries every day as expected due to low solar irradiance and by Mid-November they wouldn’t fully charge at all unless the backup generator ran long enough to fully absorb the batteries. That’s when I realized the issue had been there all along but I was too dumb to realize it last winter.
I removed the Lynx Shunt on one system and replaced it with a Lynx BMS (with BTV cable jumpered to just use it as a battery monitor) - problem solved. The other system I updated FW on the batteries and allowed the BMS’s to act as the battery monitor - problem solved.
We now don’t use Lynx Shunt’s on any projects we work on. You can search around and see there at least two critical issues with the Lynx Shunt. RVers will be unlikely to notice the issues but in stationary systems it became pretty obvious.
As Brucey said, 10% drift isn’t too bad, but it’s too much for my tastes, especially when there isn’t likely to be a full charge in the winter months for many of my customers. That’s why I put so much effort into testing commercially-available batteries to make sure they have good balancers and have a BMS that has been tested by Victron to work properly with DVCC. So many battery manufacturers advertise compatibility with Victron, but that doesn’t mean they actually work correctly for long periods of time w/o a full charge. For DIYers and tinkerers, I think it’s great that inexpensive batteries and DIY kits are available. But for the old couple who live four hours away from my shop on a mountain in their totally off-grid property, they can’t afford to have these issues.
Some folks I’ve talked to inside of Victron know it but I don’t expect to see any public acknowledgment, especially since the Lynx Shunt M10 is a relatively new product.
This is not acceptable, how can we start an official complain?
Off-grid garage already reported ONE YEAR AGO that the lynx shunt 1000 can’t handle DC loads and now it is also not usable as a simple battery SOC monitor?
I real don’t see a difference between SmartShunt and lynx shunt 1000, Victron for the x time, fix your software!!!
Yes no excuse for not showing dc load as consumption for $350 lynx shunt m10 when a $100 smartshunt does that just fine.
You can see where I started with a smartshunt 500 and then switched to lynx shunt, goodbye consumption data….
Unbelievable!
For sure they add somehow inverter losses in the SOC calculation, and because I have a big battery I see only a 10% error.
Smaller systems will face bigger errors.
Hardware is the same as a smart shunt, it is software.
And why can’t this be fixed in one year?
Victron aftermarket support is real real bad (not existent).
If a 500A limit is sufficient for you theres 3d printable lynx shunt base and cover you can use to create your own lynx shunt….even has a spot for a 275A Victron switch:
Note if you do go in that direction you will need a right angled ve.direct cable due to clearance issues with a straight connector.
Victron should fit their issues, the stuff is expressive enough.
But BMS 500 would work or will I than face the next surprise?
Victron BMSs are for Victron batteries, so won’t be suitable for your setup (yes, I know there are unsupported “workarounds” for this, but since it’s unsupported and as such could be inadvertently disabled at any time, I’d strongly recommend against it).
Your “charged voltage” is set too low so the SOC jumps to 100% too early, which leads to showing a higher SOC than is reality. Set “charged voltage” to a tenth or two below your Absorption voltage, not your Float voltage, and see how that goes.
Did hear installers use the lynx smart BMS 500 (without Victron batteries) because the shunt is more accurate then the lynx shunt 1000 and the lynx smart BMS also has a contractor to isolate the batteries.
This to approve regulation.
If I do a regular top balance SOC error is real small (settings are correct), only have this problem now after weeks of not top balancing.
And it seems a normal smart shunt out-performance the lynx shunt 1000 I use.
So what if I install the lynx smart BMS 500 instead, or replace the lynx shunt 1000 with a smart shunt?
But mine statement is, why is Victron selling the lynx shunt if it is not accurate and it has issues (not able to) measuring external DC loads?
No shunt in the world can measure loads that don’t run through it, if that’s what you mean by “external” DC loads.
As for why the Lynx is still sold, eh, I suppose because people still buy it. It’s an old product line, but some people still like the old products. If no one bought them, I’d guess they’d be retired.
Andy calls it the most expensive fuse holder, because it behaves different than the smart shunt.
I think VE direct (smart shunt) bus is older than the CAN bus?
So why is Victron not solving the issues or if they are not able, make the device obsolete!
The Lynx Shunt has been around since about 2012, the SmartShunt has existed since about 2020. The BMV-xxx series of battery monitors have perhaps been around longer than the Lynx Distribution System, but that’s a perhaps, not sure about that one.
Regardless, in practice I’ve found the Lynx Shunt is fine if you’re aware of its quirks and account for them, and you’re 100% tied into the look or functionality of the Lynx Distribution System; it serves a purpose within the ecosystem, but whether or not it’s actually necessary or preferable over one of the other battery monitoring solutions is a matter of system design.
Andy’s thoughts about anything are of no significance to me, I’ve seen plenty of the sort of things his channel advocates and I’m unimpressed. The device does behave differently than a SmartShunt, as could be expected since it’s a wildly different product than the SmartShunt in spite of both being battery monitors.
Bottom line though, I’d again recommend adjusting your settings as I suggested above, since your settings will result in erroneously high SOC readings regardless of which battery monitor solution you end up choosing. You have your “charged voltage” set below your Float voltage, which is going to result in any battery monitor jumping to 100% well before the battery bank is actually finished charging.
It always has to do with system design, that’s the common Victron answer on everything,…
Sorry this is a simple software issue in VRM and this issue is already reported 2 years ago.
The lynx shunt behaves different than the smart shunt, nothing more than software (DC consumption is missing)
Spend a day to debug and fix this, than we don’t have to complain here!
A way to report bugs and a list of known issues, would real help making the system perfect,…
