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My Open Source Solar BMS and Digital MPPT
#21
Regarding the best batteries for offgrid energy storage: obviously the 18650 are not ideal, but are the best ones still LiFePO4? Or some new chemistries like LTO the best? Or maybe something new that is not mainstream yet? Interesting topic!
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#22
Chemistry to choose of totally depends on applications and availability if you ask me. The other factor is of course Price over its usable time but if a chem is not available then its not.

But to keep this thread clean lets if we want to discuss chemistry and such in another thread => Start a new thread if further discussion is needed or we will split this Smile
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#23
(12-11-2018, 11:03 AM)Charly144 Wrote: Electrodacus. Maybe i am blind but i don’t find a detailed description of tthe bms0 somewhere... can you pls give me a hint!

Thx
Karl

SBMS0 is under development so there is no much more than the description on Kickstarter about it. Just working on the PCB right now. It will be fairly similar to SBMS40 just minus the power electronics and WiFi. The SBMS0 is designed as a low cost and only contains the BMS + the advanced energy monitor so no charger like the SBMS40 or SBMS120.
When that is design and ready it will be added to the current SBMS40/SBMS120 manual.
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#24
i'm pretty impressed by the spec of this solar charge controller with BMS included. I mean, there is not so much reviews on YT about it, which is strange, we all go tracer, or victron, or other big manufacturers brands ( i'm guilty, i went for victron too ), and ok they are slightly different as they are MPPT, but i would love some well known youtubers to make propers review of them. I buy pretty much all my hardware after having watched hundreds of video test on youtube. May be you could do your marketing somehow by providing to some of them your product for free (guys like Adam Welch that already tested hundred of mppt/pwm solar controller), i dunno, but i would have had many videos about it, i would have probably tried it, for sure.

Btw, by open source, it means that the source code of the software running inside your device is available on github too? it would be amazing if we coul develop our own extension, like adding mqtt, or http api, etc...

Thanks and good luck with your products !
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#25
(12-11-2018, 05:22 PM)raccooon Wrote: i'm pretty impressed by the spec of this solar charge controller with BMS included. I mean, there is not so much reviews on YT about it, which is strange, we all go tracer, or victron, or other big manufacturers brands ( i'm guilty, i went for victron too ), and ok they are slightly different as they are MPPT, but i would love some well known youtubers to make propers review of them. I buy pretty much all my hardware after having watched hundreds of video test on youtube. May be you could do your marketing somehow by providing to some of them your product for free, i dunno, but i would have had many videos about it, i would have probably tried it, for sure.

So by open source, it means that the source code of the software running inside your device is available on github too?

Thanks and good luck with your products !

There are a few youtube video's like this made by Martin Lorton https://www.youtube.com/watch?v=bg1x6X8tZok  it is the older SBMS100 model Julian Ilett has done a few videos but about the even older SBMS4080
I'm a small hobby builder I do not afford to send free samples for other to make videos. There are also a few of my backers that made videos on the past but not all of them are youtubers here is one example https://www.youtube.com/watch?v=HT6LXzdeGjc this is about the current SBMS120 so maybe more relevant than the one about SBMS100 that will no longer be produced.
If you check the user manual last page you will find all the SW and HW source files.
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#26
(12-11-2018, 05:31 PM)electrodacus Wrote:
(12-11-2018, 05:22 PM)raccooon Wrote: i'm pretty impressed by the spec of this solar charge controller with BMS included. I mean, there is not so much reviews on YT about it, which is strange, we all go tracer, or victron, or other big manufacturers brands ( i'm guilty, i went for victron too ), and ok they are slightly different as they are MPPT, but i would love some well known youtubers to make propers review of them. I buy pretty much all my hardware after having watched hundreds of video test on youtube. May be you could do your marketing somehow by providing to some of them your product for free, i dunno, but i would have had many videos about it, i would have probably tried it, for sure.

So by open source, it means that the source code of the software running inside your device is available on github too?

Thanks and good luck with your products !

There are a few youtube video's like this made by Martin Lorton https://www.youtube.com/watch?v=bg1x6X8tZok  it is the older SBMS100 model Julian Ilett has done a few videos but about the even older SBMS4080
I'm a small hobby builder I do not afford to send free samples for other to make videos. There are also a few of my backers that made videos on the past but not all of them are youtubers here is one example https://www.youtube.com/watch?v=HT6LXzdeGjc this is about the current SBMS120 so maybe more relevant than the one about SBMS100 that will no longer be produced.
If you check the user manual last page you will find all the SW and HW source files.

Yes i saw some indeed, but you know, its sometimes device that we will put in our house, and thus, we want to make sure it won't go wild and burn the place down coz of a bug or something. So does the importance of marketing Wink Maketing => new users => acting as QA tester => make videos => people buy from important youtube channels. But i understand your situation. But if you would raise a community around this product, with some good dev (i can help too), that would be a killer product for sure Smile'm not saying no, but not right now at least. I will check the source code meanwhile and follow up closely this kickstarter project. I really wish you the best Smile
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#27
(12-11-2018, 01:21 PM)jdeadman Wrote: For me it's about using what is going to be discarded.  I ran my entire Camp all summer on 3Kwh of Storage with only 200W of Solar   but Since I was only out there 4 days out of 7 it was all I needed.   this was my test bed.   7s56p and it worked flawlessly.    This bank also ran 80%DOD All last winter before taking it out to camp.    so 8 Months of 80%dod and 4 months of 30% dod and the cells were just finished being re-tested and all but 9 cells were the same capacity or better than originally tested.  

So this leads me to believe that as long as you are using good testing cells that are fairly close to their rated capacity a low dod Wall should last for a long time.  

Now this is just a hobby right now for me.   but in the next 10 years or so I plan of buying some land and building a retirement home which will be offgrid.   I have been researching what batteries I want to use and since it's so far off I have time to play now.  

Just a side note  the 8 months I had my camp wall running at home I only ran my fridge, freezer and Internet in a time shifting mode.   where during Peak pricing It ran off my wall and during low cost power I charged that bank.  No solar at all.   I used what I had gotten for free for everything other an the busbars, solder and battery holders.   ( I think I spent ~100$ on that and test equipment)   and I was saving about $20/month just doing that.   That savings was the difference from last years bill to this years bill where the prices did not change much.

To fully take advantage of a 3kWh battery a 600 to 750W of PV panels will have been needed.  You will need a proper energy monitor to know how much energy you used out of the battery else it will be just a guess.
Assuming that during those 8 months you were charging the battery full at night (I guess if when there where lower prices) and then run during the day down to 20% SOC then say every day you took out 2.4kWh out of that battery for 8month then 2.4kWh x 8 x 30 = 576kWh
So assuming you charged when energy was 5 cent/kWh and then used from battery when energy as 25 cent/kWh then saving will have been 576kWh x $0.2 = $115 over those 8 months. The charge discharge efficiency was ignored for simplicity.
You should have made a capacity test when you started and then another one at the end of those 8month to see what sort of capacity loss you had on your pack.
If that is true and your used cells lasted for 240 cycles at 80% DOD then they where great but they should be close to end of life by this time as new cells are good for 500 cycles 100% DOD.
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#28
In Did not do any logging nor Full pack capacity. The dod I came up with was from voltage. 4.15 down to 3.6V and I would get a full charge after 11 Hours running 7s so 29V charging @ 12A (until it got out of the Constant Current portion and into the Constant Voltage.) So only guessing at actual capacity.

But I did test each cell individually before and after that 1 year test. I have now put aside these cells for resting while I am working on my Large Wall. Eventually once the Self dischargers are identified I will package them back up into a Portable Generator style power bank with small inverter just for temp loads.

It will be neat to see how long these cells last over all. but so far so good. In my next iteration I will be adding logging and BMS (looking at yours as one of my options) as well as a better Inverter/charger with Solar later.
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#29
(12-11-2018, 06:19 PM)jdeadman Wrote: In Did not do any logging nor Full pack capacity.   The dod I came up with was from voltage.   4.15 down to 3.6V and I would get a full charge after 11 Hours running 7s so 29V charging @ 12A (until it got out of the Constant Current portion and into the Constant Voltage.)    So only guessing at actual capacity.    

But I did test each cell individually before and after that 1 year test.     I have now put aside these cells for resting while I am working on my Large Wall.   Eventually once the Self dischargers are identified I will package them back up into a Portable Generator style power bank with small inverter just for temp loads.    

It will be neat to see how long these cells last over all.   but so far so good.   In my next iteration I will be adding logging and BMS (looking at yours as one of my options)   as well as a better Inverter/charger with Solar later.

Discharging a LiCoO2 (most likely if this where from laptops) from 4.15 down to 3.6V will represent just around 30% DOD depending on discharge rate and battery temperature.
You mentioned 7s56p so 56p assuming 2Ah in average will get you a total capacity of 112Ah and just charging for 11h at 12A constant current will not be possible even if the cells where fully discharged.
Here is what sort of info will the SBMS provide. Ignore the DMPPT450 data as this is took from my system a few days ago.

   
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#30
Nice Data capture.
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