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Very good point raised by @Steve_S This is the cause of so many questions I receive like "why the charger goes to float before the battery is full?" In addition you must take into account that this voltage drop (loss) is not constant (proportional to the current)... and that makes it a...

I fully agree with you that the BMS should shut down the battery only if all other warnings and corrective measures have failed... and give a lot of warning before it does. Instead of using multiple external systems, you can use a BMS that can do all of that on top of the basic protection /...

To answer some of the questions you have regarding the comparison of REC BMS and Orion Jr, the attached document might give you some pointers. It is a BMS features comparison chart for Orion Jr BMS2, REC ABMS, 123 Smart BMS, and TAO BMS. It covers more than 100 features and specifications...

Never been so close to the polar circle, the environment must be grandiose, but I guess it gets very cold most of the time. If temperature is below 32°F / 0°C, your BMS will be all the time in low temp cutoff and the battery will be useless. You may want to look at a BMS where you can set...

You may want to add TAO BMS to that list - see the comparison chart I did... BMS comparison chart

In addition to the BMS listed above, the TAO BMS also supports the Victron CAN messages straight out of the box (as explained by @jwelter99). It has also the possibility to define custom messages to communicate with other equipment (or adapt to future capabilities)... as long as it is within...

You can have a look at TAO BMS (www.taobms.com). Up to 48V with no current limit as you select external relays / solenoids that suit your need. Maybe not the same price range?

Thanks @snoobler Yes, my mistake charge unbalance is less than 20mV (not sure what I was smoking!) and yes they are top balanced. I confirm that balancing takes place above 3.4V - currently starting with a differential of 15mV (just reduced it last week from 25mV). It is the low SOC voltage...

Comme le dit @snoobler il n'est pas nécessaire (et même néfaste) de garder une batterie lithium alimentée une fois qu'elle est pleine. Cela engendre un vieillissement prématuré de la batterie et une réduction de sa capacité. Je règle la tension "float" du régulateur solaire à 13.20 volt car...

For unplugged storage, the best is to charge to 50%, then disconnect all wires (including the BMS) from the battery, and keep the battery in a cool place. Like in your case, my system is also always on even if not on board for a long time (going overseas). Depending on location and length of...

In summary my understanding: no current cell 7 is same voltage as the other ones charging its voltage is higher than the other ones discharging its voltage is lower than the other ones That would point to a cell or connections with a resistance higher than the other ones. Where are the BMS...

Thanks, I am not in a rush and will wait a bit for the product to stabilize... keeping an eye on this thread.

Except for bluetooth, the basic version of the TAO BMS does exactly that. I see you are installing on a boat (like myself), so you will want to have advanced warning before external relays are activated (ABYC recommendation and common sense for the safety of the boat). TAO BMS has a led and...

Max load is the boiler with 110A load. All cells react the same way. Before load: 8.35 A charge - cell voltage from 3.280V to 3.289V (9 mV range) 3.5 seconds after applying 106 A load: cell voltage from 3.252V to 3.259V (7 mV range) Which approximate the cell IR between 0.245 and 0.262 mOhm...

One of the low cost contactor specification to watch is the "on resistance"... but the suppliers of these contactors rarely (never?) give that information. Just look at the suggested heat sinks they sell and that will give you an idea of the power those contactors need to dissipate. A...

I understand a "contactor BMS" may be more expensive than 2 JBD, Daly or Chargery BMS's, and is not the solution for every installation. Are there other reasons for not wanting to go that route? I have 8 x 300Ah cells (similar to your installation) configured as 2P4S with a single BMS. On...

I can only talk about the TAO BMS installation that is quite easy with a ground wire, one wire to connect to each cell, 4 fuses to insert and one switch to flip. All the wires are equipped with lugs, so no special tools required (I will make a video in the next few weeks). The complexity you...

If you have not yet purchased your BMS, you can check the comparison chart I prepared trying to be objective based on information each vendor provide. Of course it all depends on the functionality you are looking for. If you want a worry free BMS that can manage the whole installation (including...

Good looking sailboat and nice drawing! Here are some thoughts and questions that come to mind: Wind generator above solar panels can make shade and reduce panels output (I used to have a wind generator on a previous boat, but decided to do without on Tao as we have been sailing in the...

Some resources on this Forum... BMS Comparison chart Contactor (EMR) or Solid State Relay (SSR)?

I did that on the first occurrence (a few months ago) and DMM reading were the same as reported by the BMS... but I did not record the measures in my log book :( If it happens again that will be the first thing I do and record data for reference.

1st drawing: to have same resistance path for all cells the connector between positive #2 and negative #3 should be at the bottom.

First time I hear about the Chargery DCC. I rapidly went through the 20 pages of this thread and I may have missed some details. I am used to Electromagnetic Relays (EMR) and although temptation was great, I never installed a SSR on a charge or load bus... due to heat dissipation at high Amps...

I do not know the functionality of the SMBS0, but Installation on a boat has some requirements that are different from a land installation: it could be unsafe if the BMS shuts down the battery in certain situation (no VHF, no lights, no autopilot..) so the BMS must give sufficient warning at...

My understanding is that absorption time exists to compensate the fact that most chargers cannot use the voltage + tail current criteria to stop charging. But some BMS can use those criteria to declare the battery full: minimum battery voltage (I use 13.8V) maximum tail current (I use 0.025C)...

Hi, I made some observations that lead me to believe a cell is not aging as fast as the other ones. Here is the setup: 300 Ah Winston cells (2016) setup as 2P4S (600 Ah 12 volt battery). Cells have sequential serial numbers. Cells are never charged at more than 3.46 VPC. Float at 13.2V (or...

Hi, On my boat I have a 600Ah DIY 12V bank with Winston cells installed 6.5 years ago (cells with sequential serial numbers). The cells are well top balanced and yesterday the voltage for one of the cells dropped suddenly by more than 100mV compared to the other cells... then later came back to...

Can you tell us more about the way you intend to configure the cells (12 / 24/ 48 volts) and your installation (sources of charge, main loads and their usage...). Do you just want a BMS to protect the battery or one that can manage external equipment (like start a generator, cut power hungry...