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14S 100A Active BMS COMS Protocol
#1
Hi has anyone any info on these.

https://m.aliexpress.com/item/32828948173.html

I was wondering if anyone has any info on the communications protocol.
The battery inverter I'm going to use is the Sofar ME3000SP and was hoping (however much of a long shot) if this would communicate over the coms port? Either via the RS485 or the CAN 2.0.

This will only be a temporary BMS, I'm thinking this will be better than nothing until I can get the Batrium.
UK Southwest.

8 kWp Solar Panels
APS YC500i Micro Inverters.
Still sourcing and processing cells for powerwall.
Planning on a Sofar Mass Energy ME3000SP AC coupled grid tied inverter.
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#2
I think this may be it :
https://drive.google.com/file/d/0B3UXptx...ZGTTQ/view
Source : https://endless-sphere.com/forums/search...sf=msgonly

Interesting read and details of the BMS : https://endless-sphere.com/forums/viewto...14&t=88676
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#3
(01-13-2019, 10:17 PM)completelycharged Wrote: I think this may be it :
https://drive.google.com/file/d/0B3UXptx...ZGTTQ/view
Source : https://endless-sphere.com/forums/search...sf=msgonly

Interesting read and details of the BMS : https://endless-sphere.com/forums/viewto...14&t=88676

Thanks

I'll take a look at it.
UK Southwest.

8 kWp Solar Panels
APS YC500i Micro Inverters.
Still sourcing and processing cells for powerwall.
Planning on a Sofar Mass Energy ME3000SP AC coupled grid tied inverter.
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#4
https://endless-sphere.com/forums/viewtopic.php?t=91672

I got it working with solar sis from daromer, injecting to influxdb. More than a year working and makes its work perfecty, for balancing I use active balancers.
completelycharged likes this post
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#5
(01-14-2019, 09:29 PM)jesusangel Wrote: https://endless-sphere.com/forums/viewtopic.php?t=91672

I got it working with solar sis from daromer, injecting to influxdb. More than a year working and makes its work perfecty, for balancing I use active balancers.

The version I have ordered is supposed to be active, I guess I'll find out when I get it and try it out.
UK Southwest.

8 kWp Solar Panels
APS YC500i Micro Inverters.
Still sourcing and processing cells for powerwall.
Planning on a Sofar Mass Energy ME3000SP AC coupled grid tied inverter.
Reply
#6
Above links is NOT active balancing. Its passive balancing at around 50mA max current. The active part is that you can set the thresholds....
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#7
(01-14-2019, 10:15 PM)daromer Wrote: Above links is NOT active balancing. Its passive balancing at around 50mA max current. The active part is that you can set the thresholds....

Dang I thought it was to good to be true.
Do you know of a cheap active alternative to a Batrium?
I'm holding out for the watchmon6 release but also want to get my wall up and running.
I have 28 packs sat waiting ready to go.
UK Southwest.

8 kWp Solar Panels
APS YC500i Micro Inverters.
Still sourcing and processing cells for powerwall.
Planning on a Sofar Mass Energy ME3000SP AC coupled grid tied inverter.
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#8
The version that is active has a single large (relative to the board componentes) isolated DC-DC converter on the board and only balances one cell at a time. It takes a DC supply from the whole pack and charges the lowest cell, switched by FET from a common charge bus output from the DC-DC supply..

If the passive balancing can be switched by command (appears yes from the link via jesusangle) then 50mA would work ok for a pack as you can have the balance active for many hours to adjust the energy balance per series set of cells. Would require an external application to effectively take control of the balancing, quantify the energy imbalance and then work out how many hours 50mA drain would be needed to rebalance.... or just switch on until the voltages align to within 0.05V whatever the SoC ?
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#9
Do you really need active balancing? Most people think they save energy and or money doing active but in real life we talk about 10 years before the cost getting the system is earned...

Have you watched my video regarding it?

Active have its purpose of course but if its to save energy most people are wrong. Is it because you have a pack that do have different sizes or a system you cannot maintain like big ass cells then its a bigger use. Lastly the current many active balance with are very limited compare to the current you need to pull out of the system so on medium to high current systems active wont to much good in long term Smile
Korishan likes this post
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#10
If active balancing is needed to keep your packs balanced, and/or large currents (>100mA/100 cells), then there is something wrong with the cells in the packs. The problem/suspect cells needs to be replaced with better ones that aren't self discharging and/or the capacity from pack to pack is not close enough. Make sure every parallel pack in the series string has as equal to the 'exact' same capacity as the others (this is hard with reused cells, yes, but doable; <100mAh variation is achievable, even <50mAh is as well.)
Proceed with caution. Knowledge is Power! Literally! Cool 
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