Just worked out a better way to calculate available capacity although it's much the same as what I did in the video. kWh charged / % charged x 100 = usable capacity. So for me it's 55kWh/95.7% x 100 = 57.47kWh. Then can find percentage of original capacity (ie. 100/60.4 x 57.47 = 95.15%) you could probably - or + 1% from this too as only displayed the nearest kWh (rather than Watt hours). Also dependant on the remaining SoC being accurate. Also assuming that 60.4kWh was the original usable capacity (which I never measured). This will be far more interesting once I've done the same test on future calibrations, as I can then compare. (If there are any mathematicians out there feel free to correct my maths.)
Please note: The OBD2 device I'm using is Android compatible, there is a different model that is compatible with iOS. Please check if the OBD2 blue tooth device compatible with your mobile. Re uploaded this because, previous version had a couple of errors 😳.
I have a home battery system that is LFP. Its nominal voltage is 25.6v (3.2 x 8). The system balances the cells during charging. It’s interesting to watch the cells during charge. The cells stay balance (4-10mv) without the need for any balancing happening. Under load there is some variation above 10mv in which case the balancing is activated. When the cells approach 100% capacity the cell variation increases and balancing is occurring across a range of cells. At this point it’s difficult to tell what the cell voltages are as balancing is working overtime. Once the battery is at 100%, the cells settle quickly as my system always has a load on the battery to feed the 230v system through the inverters connected to the battery. This would not be the case with an EV as there is no real load required, just the minimal load to feed the 12v system. After full charge has occurred, the cell delta is usually 4-8mv within a minute. I can see parallels to the battery monitoring you have found. I find this all very interesting.
@@EVswitch The cells are Winston (24 300ah cells configured as 3P8S). I’ve had them running our house off grid for 6.5 years. The battery management system is an ElectroDacus SBMS 120. The 35 solar panels are selected as required by another device to maintain constant charging throughout the daylight hours.
Yeah, I probably wasn't too clear on that. I had just over 4% of the battery according to the "guessometre" on the dash, so that added about 2.5kWh. So it was an estimation of current capacity. There might be a better way of doing it.
@@EVswitch I have done a test fowwing your method on a New Seal and I was hopping to share the details with you as I am getting some no so good results. How best to communicate in private if possible to share the info?
I'd say this is dependant on an accurate SoC. I tried to be as accurate as possible by charging to 100% the week before getting it under 10% then calibrating to 100%. Also I just worked out a better way to calculate this although it's much the same. kWh charged / % charged x 100 = usable capacity. So for me it's 55kWh/95.7% x 100 = 57.47kWh. Then can find percentage of original capacity (ie. 100/60.4 x 57.47 = 95.15%) you could probably - or + 1% from this too as only displayed the nearest kWh (rather than Watt hours). feel free to email your details at h264bluris20@gmail.com
Haven't tried with the Seal, and the profile doesn't seem to be listed in the app. Maybe try the BYD OBD2 basic sensors profile? Can confirm works with Dolphin though.
Hi Mate I’m looking on the IOS App Store, there is so many apps that contain the name of car scanner, can you please advise the full name or give a link
With the OBD2 device you should have instructions on which apps will work with it. I'm using Car Scanner ELM OBD2 with Android. My Veepeak VP11 model doesn't work with iOS. In the instructions it says you should choose the Bluetooth LE (4.0) model for iOS.
Can anyone please tell me if this will show me the status of the car when I am connected to a public charger? Presumably I will need to be in Bluetooth range....unless there's another way of doing this? Thanks.
BYD have an app for tracking the charging progress of the car. Not individual cells or cell voltages or anything like that, just the overall state of charge.
@@TheHuesSciTech Thanks, but I have the Yuan Plus which has the original software, which I am told by the very unreliable seller of the car, is not updatable and therefore the app won't work!
Just worked out a better way to calculate available capacity although it's much the same as what I did in the video. kWh charged / % charged x 100 = usable capacity. So for me it's 55kWh/95.7% x 100 = 57.47kWh.
Then can find percentage of original capacity (ie. 100/60.4 x 57.47 = 95.15%) you could probably - or + 1% from this too as only displayed the nearest kWh (rather than Watt hours). Also dependant on the remaining SoC being accurate. Also assuming that 60.4kWh was the original usable capacity (which I never measured). This will be far more interesting once I've done the same test on future calibrations, as I can then compare.
(If there are any mathematicians out there feel free to correct my maths.)
Please note: The OBD2 device I'm using is Android compatible, there is a different model that is compatible with iOS. Please check if the OBD2 blue tooth device compatible with your mobile.
Re uploaded this because, previous version had a couple of errors 😳.
Excellent info 😎
I have a home battery system that is LFP. Its nominal voltage is 25.6v (3.2 x 8). The system balances the cells during charging. It’s interesting to watch the cells during charge. The cells stay balance (4-10mv) without the need for any balancing happening. Under load there is some variation above 10mv in which case the balancing is activated. When the cells approach 100% capacity the cell variation increases and balancing is occurring across a range of cells. At this point it’s difficult to tell what the cell voltages are as balancing is working overtime. Once the battery is at 100%, the cells settle quickly as my system always has a load on the battery to feed the 230v system through the inverters connected to the battery. This would not be the case with an EV as there is no real load required, just the minimal load to feed the 12v system. After full charge has occurred, the cell delta is usually 4-8mv within a minute. I can see parallels to the battery monitoring you have found. I find this all very interesting.
Cool. That's interesting. What brand is your home battery? Is it BYD too?
@@EVswitch The cells are Winston (24 300ah cells configured as 3P8S). I’ve had them running our house off grid for 6.5 years. The battery management system is an ElectroDacus SBMS 120. The 35 solar panels are selected as required by another device to maintain constant charging throughout the daylight hours.
formula clarification pleae at 6:16 of your video you have a calculation of 55KWh = 2.5KWh = 57.5 where did you get the 2.5 value from ?
Yeah, I probably wasn't too clear on that. I had just over 4% of the battery according to the "guessometre" on the dash, so that added about 2.5kWh. So it was an estimation of current capacity. There might be a better way of doing it.
@@EVswitch I have done a test fowwing your method on a New Seal and I was hopping to share the details with you as I am getting some no so good results. How best to communicate in private if possible to share the info?
I'd say this is dependant on an accurate SoC. I tried to be as accurate as possible by charging to 100% the week before getting it under 10% then calibrating to 100%. Also I just worked out a better way to calculate this although it's much the same. kWh charged / % charged x 100 = usable capacity. So for me it's 55kWh/95.7% x 100 = 57.47kWh.
Then can find percentage of original capacity (ie. 100/60.4 x 57.47 = 95.15%) you could probably - or + 1% from this too as only displayed the nearest kWh (rather than Watt hours).
feel free to email your details at h264bluris20@gmail.com
love your video however we cant see to communicate with the seal model the same way.
Haven't tried with the Seal, and the profile doesn't seem to be listed in the app. Maybe try the BYD OBD2 basic sensors profile?
Can confirm works with Dolphin though.
Hi Mate
I’m looking on the IOS App Store, there is so many apps that contain the name of car scanner, can you please advise the full name or give a link
With the OBD2 device you should have instructions on which apps will work with it. I'm using Car Scanner ELM OBD2 with Android.
My Veepeak VP11 model doesn't work with iOS. In the instructions it says you should choose the Bluetooth LE (4.0) model for iOS.
Can anyone please tell me if this will show me the status of the car when I am connected to a public charger? Presumably I will need to be in Bluetooth range....unless there's another way of doing this?
Thanks.
BYD have an app for tracking the charging progress of the car. Not individual cells or cell voltages or anything like that, just the overall state of charge.
@@TheHuesSciTech Thanks, but I have the Yuan Plus which has the original software, which I am told by the very unreliable seller of the car, is not updatable and therefore the app won't work!