Been a keen follower of your BMS for a long time now Stuart. When can we get a schematic for the current monitor? I'd love be to get this into kicad and play around.. even if it's not fully ready yet.
I've not released the code or circuit yet as they are still both work in progress. If you look at the INA228 datasheet, its largely the reference circuit from that.
Nice, Know of any central DIYBMS that are otherwise similar with less cost? Looking at chip TI BQ769142PFBR ,do not look pricy, with most things already done, like cell balancing and including columb, current...
@@StuartPittaway Just tell me if i can help you with anything. My Victron equipment will be at your disposal. (I'm the above guy, I was writing through one of my iot gadjets 😅)
@@StuartPittaway I think you might wanna check out the ACS722 chip. It basically samples current via 2 terminals and outputs an analog output signal. It doesn't seem to have a voltage rating. If there's a way to implement it into the board, then we are good to go to monitor batteries over 85v.
Great work! Will it have SoC calculation as well? How much voltage will it handle. I have a 16S 48V pack of EVE cells today running a Daly BMS but I'm thinking about maybe building a 60-64s battery to be able to connect to a HV Hybrid inverter. Will components of diybms handle that?
@@StuartPittaway Thank you for the quick response. What is limiting the voltage to 85V? And is that limit only on the current monitor? I was under the impression that the bms could handle 64S and therefore also the voltage that 64S created. The voltage is on the other hand of course related to what chemistry the batteries have.
@@mrlissmats yes the 85V limit is for the current shunt. I don't recommend going over 48V in general though, DC high voltage isn't something to be messed about with!
Excellent. Although I think the shunt is quite bulky. Did you consider those from Vishay like WSBS8536-20? See www.vishay.com/docs/30397/wsbs8536-20.pdf . Would make the PCB smaller...
@@StuartPittaway I do actually think that it would handle a lot of current with 72mm2. The 100microohm Version would handle 80V/500A short term easily depending on your measuring circuit...
Can't wait until this is officially released!! Keep up the great work! :-)
Thanks! Will do!
Thank you dear Gentleman 👌🏻
Any time!
Thank you Stuart!
My pleasure!
Good job
Thanks
Cool, I noticed recently just waiting for you to release a new movie 💪 thx
More to come!
Thank you Sir.
You are most welcome
Been a keen follower of your BMS for a long time now Stuart. When can we get a schematic for the current monitor? I'd love be to get this into kicad and play around.. even if it's not fully ready yet.
Can't wait to get my hands on the monitor either. Looking like another solid piece of the DIYBMS puzzle to play around with.
I've not released the code or circuit yet as they are still both work in progress. If you look at the INA228 datasheet, its largely the reference circuit from that.
Nice, Know of any central DIYBMS that are otherwise similar with less cost? Looking at chip TI BQ769142PFBR ,do not look pricy, with most things already done, like cell balancing and including columb, current...
I've not really explored that route.
Nice job! Do you think that it may be made compatible with victron units? Making it a replacement for the bmv702?
If I can get the controller to communicate with the Victron devices then yes, its possible.
@@StuartPittaway Just tell me if i can help you with anything. My Victron equipment will be at your disposal.
(I'm the above guy, I was writing through one of my iot gadjets 😅)
@@seriusrod Thanks
This board has amazing capabilities. Just one thing: is there a way to increase the battery voltage monitoring capability to more than 85 volts?
No, 16 cella and the voltage limit is set by the max chip.
@@StuartPittaway I think you might wanna check out the ACS722 chip. It basically samples current via 2 terminals and outputs an analog output signal. It doesn't seem to have a voltage rating. If there's a way to implement it into the board, then we are good to go to monitor batteries over 85v.
MODbus over RS485?
Yes thats correct.
Hey Stuart, Can this bms balance LiFePO4 cells ? what have you been using ?
Yes lifepo4 voltages are supported. Take a look at the openenergymonitor forum for people using it with those cells
Great work! Will it have SoC calculation as well? How much voltage will it handle. I have a 16S 48V pack of EVE cells today running a Daly BMS but I'm thinking about maybe building a 60-64s battery to be able to connect to a HV Hybrid inverter. Will components of diybms handle that?
It may have SOC, depending on how difficult the maths is! It definitely will have amp hour counting. Up to 85V battery packs are supported
@@StuartPittaway Thank you for the quick response. What is limiting the voltage to 85V? And is that limit only on the current monitor? I was under the impression that the bms could handle 64S and therefore also the voltage that 64S created. The voltage is on the other hand of course related to what chemistry the batteries have.
@@mrlissmats yes the 85V limit is for the current shunt. I don't recommend going over 48V in general though, DC high voltage isn't something to be messed about with!
Excellent. Although I think the shunt is quite bulky. Did you consider those from Vishay like WSBS8536-20? See www.vishay.com/docs/30397/wsbs8536-20.pdf . Would make the PCB smaller...
That style of shunt only supports very low current. If you want more than a few amps, you have to go big.
@@StuartPittaway I do actually think that it would handle a lot of current with 72mm2. The 100microohm Version would handle 80V/500A short term easily depending on your measuring circuit...
@@syrafale346 short term is the key, in a power wall you could be pulling several kW for hours on end