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Dyness batteries: be very careful!!!

Last February 2022 we bought three Dyness B3 battery modules to make up a solar system with two Victron Multiplus working in parallel. We managed to set up the system correctly with the info received from Dyness and it was working OK. After some weeks of use, we realised that the battery bank was too little for the inverting power capability of the multipluses, and we decided to buy two extra B3 battery modules.

The new modules were bought June'22 and tested. There started the problems: when connected together with the original modules it was obvious that something was not working well, we started to receive communication alarms from the batteries. We had the impression the modules were not communicating properly through the CAN bus. We asked Dyness technical staff and for our big surprise they told us, after asking for the S/N of each module, that the three first modules and the two second modules WERE NOT COMPATIBLE!!! They updated the product (new current specs, new BMS...) and did not even change the name of the model. Incredible.

From the outside the modules looked slightly different, we noticed it upon reception. Not big differences, the only obvious is that new model has an RJ "COM" connector in the frontal panel, to the left of the two CAN bus connectors. All the rest is basically the same.

I have been working in the electronics & telecom industry for more than twenty years and I never saw such a compatibility break from any label. Even more having in mind that battery modules are designed to work together.... The Dyness staff did not accept to give us a solution, just told us we had to go back to the dealer. Well, I have done so but our dealer says they can not change my modules by the compatible model without Dyness approval, and Dyness is not responding their messages. So now we ended up with two modules for a value around 2300€ that we can not use... Maybe we will get some solution from our seller but this is still very uncertain. What is crystal clear is that Dyness is not properly responding to the problems they cause to customers because of their poor development policy, to say it in a polite way.

So a word of warning for all seafarers: be very careful buying Dyness B3 modules from different sellers or at different times: it is not said that they will be compatible!!!
Regarding our company, for sure we will avoid putting ourselves again in the hands of this label.

rrofes asked

0 Answers

12v UPS battery display only unit with phoenix and multiplus range

Hi All,

I'm looking for a solution where one can add a basic display only unit on a 12v battery connected to a phoenix or multiplus inverter/charger

hdp asked

0 Answers

Victron Lead Acid Batteries - Failure ?

All Victron batteries must have a manufacturing error after a lot of test and research on around 300 batteries from Victron mainly super cycle 25AH over 250 and 18 batteries Gel Deep Cycle 220Ah.

Most of the super cycle they fail within 6 months to 1 year even if you have them on float voltage and not cycling them, if cycling them on a solar system best you can get is 6 months. 30% got a catastrophic effect of swelling. Other manufacture of batteries with 4 year floating still there and running without a problem the only difference is that is 18Ah instead of 25Ah.

After 1year of using them new ones with serial numbers came out thinking they fixed the problem but at the end they all failed from 25Ah day one measured with a proper load tester they all end up at 3Ah the ones that are always on float voltage , the ones doing cycles are 100% dead. It was a big loss for us and there is no support or guaranty from our local dealer since they are not replying to our calls. They tried at the beginning to help but that didn't help since there is no response.

The 220Ah at a controlled environment at 25-30 degrees Celsius 70% state of charge as a discharge they get a half capacity if not less on some of them after 1 year.

After 1 year and 2 months it was failing cause of some of the cells in series of the 4 was actually close to 50Ah and some on 119Ah on 2 strings parallel of 4 in series.

All batteries show a good voltage like a new graph but with the difference of the capacity instead of 220Ah there new capacity 120Ah or 50Ah, on the small ones 25Ah when new but after 6 months to 1 year 3Ah if not swelling.

Note that internal resistance was measured but it can’t be trusted since it was showing good on a lot of cases but the capacity was not there, most test where done with C20 and C10 when new even C2 was good.

Hope this 2 year test and research on Victron batteries will help.

What is your experience with the Victron Lead Acid Batteries?

Alexandros asked
Alexandros edited ·

0 Answers

Victron Multiplus 12/1200/50-16,230v - AC Grid feed-in based on Battery Voltage

I would like to be able to feed-in to the AC grid when the battery voltage exceeds a certain voltage (10.0V), the battery has an external charge source and the inverter will maintain this desired battery voltage by feeding the excess energy into the grid. Please advise on how to set this up. I have all the necessary protocol equipment such as the CerboGX modules, MK-USB3 cable, GX Touch, BMV etc but looking for advise on how to configure the inverter for the desired operation. Please advise.

solshare2022 asked

0 Answers

Batteries et rechargement par groupe


Mon questionnement est certainement basique mais je rame encore un peu sur le fonctionnement de mon installation. Ma maison n'est pas reliée au réseau électrique, elle est complètement autonome. Les anciens propriétaires ont fait l'installation photovoltaïque (en 2015/2016?). 2 PV 250w, 2 régulateurs MPPT 100/15, 4 batteries AGM BTL12/200 (qui ont déjà 5 ou 6 ans mais très bien entretenues), un onduleur Multiplus Compact 24v/1200va/25a, et un contrôleur de charge. Au départ, chaque PV était branché sur un régulateur. J'ai rajouté deux PV 280w car la production était trop insuffisante pour les longues périodes nuageuses. Et j'ai aussi un petit groupe électrogène de 2kw. J'ai mis les PV en série branchés par deux à un régulateur par série (les deux anciens sur un régulateur et les deux nouveaux sur l'autre, soit 2×250w et 2×280w). Alors oui, les régulateurs sont sous-dimensionnés pour absorber toute l'énergie produite par les panneaux mais le vendeur des derniers PV m'a dit que ça ne gênait pas le fonctionnement, l'installation n'était simplement pas optimisée. Il me faut redimensionner tout ça mais je n'en suis pas encore là (d'ailleurs tous vos conseils pour dimensionner une installation sont les bienvenus). Et jusqu'ici tout fonctionne. Mais ce weekend, les fusibles des régulateurs m'ont fait faux-bon. L'un a grillé, et l'autre était en partie mal connecté. Je n'ai pas établi la cause, je n'étais pas là ce weekend mais une erreur de manipulation de la part des personnes présentes pourraient bien être l'origine. Toujours est-il que personne ne s'est rendu compte que les fusibles étaient grillés. Les régulateurs n'ont pas rechargés les batteries qui se sont déchargées progressivement (le frigo est branché en permanence) jusqu'à ce que l'onduleur se mette en sécurité pour éviter une décharge profonde. En rentrant dimanche soir, je réalise qu'il n'y a plus de courant, les batteries sont à 10v, je trouve la panne, je règle le problème, je fais tourner le groupe 2h pour recharger un minimum vu qu'il fait nuit et que le frigo va redémarrer. Lundi, pas de soleil, les PV rechargent très peu, le frigo consomme toujours, hier, pas de soleil, les batteries rechargent très peu, le frigo consomme toujours, en rentrant hier soir : pas de courant, onduleur en sécu, les batteries sont aux alentours de 7,5v! Il est trop tard pour démarrer le groupe (j'ai des voisins). Ce matin, nuageux, les PV produisent peu, je démarre le groupe. Maintenant j'essaye de comprendre.

1) Est-ce que lorsque le groupe recharge, les panneaux produisent toujours ? Les deux modes de productions sont-ils en simultanés ou est-ce que le groupe prend le relais et les panneaux "tournent dans le vide"?

2) À partir de tous les éléments de puissance décrits plus hauts, combien de temps dois-je faire tourner le groupe pour recharger les batteries ? Quelqu'un peut-il m'expliquer quel est le calcul ?

3) Les batteries sont descendus à 7,5v, elles ont passé la nuit comme ça (environ 8h). C'est des batteries AGM. Quel impact sur leur durée de vie ? Dois-je envisager de les changer rapidement ? À quel point peuvent-elles supporter ce genre de décharge profonde (sachant que c'est la première fois) ?

Merci pour vos réponses. Je ne suis pas hyper au point sur toute cette technologie mais j'essaie de comprendre et je progresse doucement.

erika-grenouille asked

0 Answers

Phoenix 24/3000 - Erfahrungswerte Batterie-Erneuerung LiFePo

We would like to replace our old AGM batteries (600 Ah) with modern LiFePo batteries in our garden house (6panels, 1.2kWp power, Phoenix 24/3000 and a MPPT 100/50 BlueSolar). Can anyone share their experience / recommendations here? Thanks a lot

offgrid-see asked
offgrid-see commented ·

0 Answers

Are Fuses or Breakers Necessary Between Battery and Lynx Distributor?

In my set-up the 4/0AWG wires that connect the batteries to the [Battery Bank] Lynx Distributor do not feature fuses. There are fuses internal to the Lynx Distributor, but the wires are effectively unprotected until they reach the Lynx Distributor.

Of course, I’ll keep those runs as short as possible (less than two feet long per wire/conductor) but it still seems weird to me to have a wire run unprotected.

Should I have an MRBF, or similar, fuse directly on the battery terminals?

Should I be using a different fuse or circuit breaker to protect the wires between the batteries and the Lynx Distributor, or is the system safe as it's currently designed?

The wiring schematic in the Lynx Smart BMS doesn't show any fuses in that location.

The example schematic on the Victron Support site doesn't show any fuses here (https://www.victronenergy.com/upload/documents/MultiPlus-II-3KW-230VAC-12VDC-600Ah-Li-Lynx-Smart-BMS-&-distributors-Cerbo-GX-touch-generator-MPPT-Orion-Tr-Smarts.pdf).

On the other hand, this post (https://community.victronenergy.com/questions/108271/mega-fuse-arcing-dangers-lynx-distributor-li-batte.html) on the community makes me think I will need protection, if what that discussion says about Lithium batteries arcing past MEGA fuses is correct.

midwest-van-man asked
midwest-van-man edited ·

0 Answers

Low Voltage Alarm goes off earlier and earlier

We have noticed that our voltage drops under 10 so the low voltage alarm goes off. This never happened 2 months ago, but now it is happening more and more. When this problem first occurred, it happened when the battery level was around 20%, but it is coming earlier and earlier. The two last times the low voltage alarm starts when the battery is at 31% , and the voltage seems to be low.

But why does this happen? and why is it coming earlier and earlier?

helgamarie asked
klim8skeptic commented ·

0 Answers

Marine Battery tray for Smart 200ah LifePo4

Sorry for the niche question, but has anyone found a marine battery tray (plastic or Stainless) to tie down a Victron 200ah Smart LifePo4 battery on their boat.

Having trouble sourcing one that fits.

sweyn asked

0 Answers

Battery preconfiguration varta agm


I have got the Victron 100/20 and two Varta batteries of the type: 840 095 085 C54 2

II was wondering which of the battery preconfigurations would be the best for my batteries.

Right now the standard preconfiguration "victron deep discharge(2)" is selected, because I have not changed anything in the settings yet.


lixi asked

0 Answers

Bluesolar DUO with different batteries - e.g. Li & AGM

1) Would it be possible to have two different types of batteries with Bluesolar DUO? For example 12V LiFePO4 and 12V AGM battery or then two AGM batteries with different sizes.

2) Also is there any output for battery cut-off at low voltage on Bluesolar DUO? Of course I want to keep my batteries without getting to too low voltage... Even a separate relay would be ok, but I would not like to build the logic for that (Battery Protect device is too expensive also).

3) How about two batteries of same type & capacity (Li, AGM or so), but having one completely empty and other one full. Example: You connect the full or empty battery on bank 2, while the othe one in bank 1 is in different state, what happens?

avaruuslehmipoika asked

0 Answers

VRM shows battery discharging when battery is disconnected

I have an EasySolar II GX running with LFP batteries. If I isolate the battery while the EasySolar is connected to PV it continues to run quite happily - which I understand is the expected behaviour, assuming the load doesn't exceed what the PV can deliver.

What I do not understand is why the VRM continues to show power being taken from the battery when it clearly it cannot be the case. Is this an artefact of running at no/low load or something elese?


Suggestions as to why this occurs gratefully received.

nigelp asked

0 Answers

Three Battery Banks Walked Into A Bar…


Hi all! I really apologize if this is a stupid question. I have looked all over the Q&A section

of this website and have not been able to find the answer but I am a newbie.

I’m trying to build a pretty uncommon set up. Three battery banks. 2 x 2p16s packs running nominally 102v (powering Elco EP-70s) and a 2p8s pack running 24v (House and HVAC). Ugly whiteboard drawing attached for your amusement. Anyway, I would like to send all the BMS data from all three packs to an MFD via Victron. Cerbo GX or Venus seem capable but seem like they can only see 1 DC power source(?). I am sure I am missing something here…

(Since I am planning to use a 150 x 3.2v LiFePo4 prismatic 302Ah cells I need a BMS which can monitor that large number. I am planning to use REC BMS and will attach a diagram they provide on their website for your enjoyment. I am open to suggestions of a more elegant solution).

Thanks for your help!!


matthew-greer asked

0 Answers

Parallel strings of Flooded VS Lithium information.

Very informative article regarding Series and Parallel Strings of Batteries using both Lead Acid and Lithium.


johnsmith asked

0 Answers

Matching cable lengths to a lynx power in?

I know that all pos battery and all neg battery cable lengths should match running to a Lynx power IN bus. Why is the additional length of the bus bar not considered? I know it's a far smaller AWG (equivalent) compared to, say, 2/0 AWG with low resistance but I would think it would still figure in some calculation, no? The bus bar on the Lynx Power In is ~256mm2 which is really close to 500MCM wire.

Would it be good to wire the 4 x batteries diagonally into the Lynx Power In?

I assume that all positives and all negatives do not need to be the same length as long as all the positives are the same length and all the negatives are the same length?

jefffay asked
jefffay edited ·

0 Answers

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