Recent content by Peter WA

Unfortunately no. There is no balancing happening at all. The little step down is when charge current drops to 0. Just settling and surface charge dissipating. Leaving the charger connected for several hours after does not make any difference. And unlike some reports from BYD users, the car...

Sorry for the late reply, I got no notification :-( In the first image you see what I get. I don't get individual cells. I get 12 modules. Each module must be 10 cells. For a total of 120 cells. If I multiply the average cell voltage by 120, I get 409V, which is what the car displays. All ties...

Thank you so much for being so responsive and helpful. If we can't get the BMS software version number to compare, there is no point for me upgrading to the pro version of the app. In that case I just assume my OVMS gives me all there is to see. Regarding cell voltages: even my unbalanced pack...

Sorry, typo, 3.65 of course. Fixing it above. Is the connection profile in that version of car scanner still called "MG MR5EV / Marvel EV/ MG ZS EV Facelift 2022'? Would you be able to check whether you can read out a software version for the BMS? It's in the section called 'ECU Identifiers'...

I've tried using car scanner too just to see, but I don't get any useful info for my car from it. Are you using the paid version or the free one? In the ECU list BMS is one of the tick-boxes, but it is off by default, and when I pick it, no data comes back. Very weird. So we actually can't...

When do you usually check this? Reason I ask: When my car first ticks over to 100%, before (not actually) balancing, the highest cell voltage is 3.65V. Since yours is only 3.35V, something is different. Well, yours is better. Although 3.35V, with no load, would be closer to 98% charged than...

Amazing how close your cell voltages are 3.35 to 3.36V. Interesting to see 99.9% SOC, not 100%, I wonder if your battery did properly balance after charging to full. I can only wish mine was like that too...

Usually the charge current drops very low when (passive) balancing. Usually into the mA range. That's why it will take a very long time. But instant wattage that needs to dissipate is a lot lower. Should be around 1W per cell that is high. To do a numeric example: let's say my worst cells are...

You've got the JK Inverter BMS? That's the one I have. It happily talks with my Victron Multiplus II 48/5000 Inverter Charger via CAN bus. I run it in close-loop configuration (BMS is in the driver's seat, Inverter does what it is told with respect to target voltage and current) and have not had...

Assuming your car actually does a balance, a stop in between should not be a problem. It should balance every time it reaches 100%, if the cell voltage difference exceeds whatever threshold MG has programmed. Doesn't matter whether it came from 8% or 91%. Quite likely it should even update...

I have the same set-up at home (also JK BMS), and yes, it is fantastic. And amazing how quickly it got the cells that well balanced. 2A active balancing is the way to go! Careful though with the screenshot: at that voltage level cell voltages are very close together, even when cells aren't well...

Good news and bad news. The bad: CATL doesn't sell cells on the open market AFAIK, and wouldn't sell to businesses that do. So these have either fallen off a truck, are recycled from wrecked cars, or plain old fakes. Which then begs the question how accurate the specs are. The good: As to...

And when you then start the car, have a look at the HV battery voltage on the display and let us know. Also note: if the battery is very poorly balanced it might take multiple balancing sessions to get it back to normal. If it actually does balance. I still have my doubts my car does. I can...

Yes, my car has 51kWh of LFP cells. I'm not saying that the chart shows the actual degradation. It is however what the BMS reports via OBD2. Every single day the car gets turned on the countdown timer continues. I am currently following the instructions I got above: drive until SOC is well...

Regarding your photos: the second one has load on the battery, 5A, that would have dropped the voltage. Also: surface charge will come off quite quickly. So really depends on how soon after the end of a 100% charge one looks. As to worry: not sure that is the right conclusion, maybe I need to...