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Forum Index : Solar : AGM batteries series parallel thoughts.
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| bob.steel Senior Member  Joined: 27/02/2020 Location: AustraliaPosts: 188 |
See you just don't get it do you . You won't read properly or completely you just gloss over . When people are wrong they are just wrong . There is a video on utube about the origins and patents applying to China and I'll just tell you again , YOU CAN NOT BUY NEW LITHIUM BATTERIES FROM CHINA LEGALLY . They have patent agreements with USA and japan . So you are ignorant of that fact but post the rubbish anyway. The patents are about to run out and Tesla is building huge factories in China to switch their batteries to LFP. Thats why they have not used them in their cars until only recently . Don't believe me search ! I'm not running members down , I'm pointing out that your knowledge on LFP is severely lacking . If you don't like that ,dont read it but dont post ignorant comments assuming you are right . You are not . I research scientifically everything I have said here and ts proven and correct. Go look at the pictures and posts on the facebook page if in doubt . The research papers are there too. |
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| noneyabussiness Guru  Joined: 31/07/2017 Location: AustraliaPosts: 506 |
no... no I don't, but I'm seriously thinking I'm not the one " not getting it " cause you are running RESPECTED members down with clear mis-information.. why NO ONE has responded favorably to you, some have partly out of respect, but that shows their personality more than yours.. lol, yeah cause china has always respected patents..never copied or mis-represented products as their own... sure... i know i know, youboob said its how it is so it must be right.... right... I have searched, also asked respected / knowledgeable people.. and also EXPERIENCED, and come to my own conclusions based on above.. all completely different to the rubbish you continue to tout.. but if you wish to believe it / push it then go right ahead.. but to continue to knock other respected members on here will just get you shouted down / ignored.. yes they are not perfect, and im sure if ANY were so completely " wrong " as you have pushed then they would have respectfully accepted that, but funny, non have.. oh and as others have done, everything I've personally posted on this subject has been through experience over the last 10 + years(others wayyyyy longer and wayyy more experienced, but i digress), yes I do make mistakes ( as im sure others have) but I LEARN from them and continue on and If i can help someone with those said mistakes then great, if thst person isn't interested then good one em .. so if its " wrong " then i must be seriously missing something.. but hey, again you want to use lithium for your system, go hard son... I think it works !! |
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| Davo99 Guru Joined: 03/06/2019 Location: AustraliaPosts: 1577 |
The one who does not get it is YOU. No one here cares anymore about what you say or if Lithium are the best batteries in the world or not. Your obsessive, abusive ranting about is not a sign of a healthy mind or an objective disposition. They are batteries and even if you do have some sort of vested interest in selling them or similar, your fixation with trying to convert everyone to the same cult like worshippoing for them as you have is not convincing anyone. Please Just go away back to your farce book page. Your behavior is becoming disturbing as well as boring. |
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| mab1 Senior Member Joined: 10/02/2015 Location: United KingdomPosts: 151 |
Bob, if i can try for some constructive criticism:- You may know a lot about lfp - and i and others would be interested in your knowledge of repair/recovery/real world lifespan/etc, but you might be better off starting your own topic and posting your findings and knowledge there. As we all have some lithium batteries in tools/ phones etc such knowledge is useful. You do however demonstrate a lack of knowledge / experience about lead acid, and would be better off simply focusing on what you have learned about lfp, rather than quoting the inaccurate claims /exaggerations about lead acid commonly found in lithium battery sales pitch. Many of us have 1st hand experience of lead acid stretching back decades, and most of us have considered lithium and have consequently kept an eye on pricing - the best prices i personally have seen are for pylontec here in the UK and - so far - people who have them have been pleased with their reliability and longevity ( but it's still early days for the latter), but lead still works out cheaper* even without the cash value of scrap lead, and for me, a better choice** * i have to discount you argument about only needing 25% Ah with lithium - whilst an off-gridder might try to keep dod to <30%, having the option to go to 50% occasionally, plus the security of having another 50% in reserve (what if the genny won't start? What if you're snowed in and can't get a new part to fix the genny 'til the road's clear?) Is common sense if you're really off the grid. **we all do this for different reasons, I'm here for reasons of minimising my environmental impact - and one of the factors in my choice of lead acid is that the recycling industry for lead acid is already in place and achieves a real world figure of 97% recycled for lead acid batteries; I've yet to hear of even speculative figures for recycling lithium batteries. |
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| bob.steel Senior Member Joined: 27/02/2020 Location: AustraliaPosts: 188 |
Like it is said . "You can lead a horse to water but you can't make it drink . " Those who have their mouths open tend not to be able to listen at the same time I have found and the lack of willingness to even inform yourself of the facts astounds me. Simple searches would do the job. I gave up Lead acid because every time I went to start something the bloody battery was dead if it was older than 3 years . My tractors ,my boat,my car ,my home solar,my water pump. Especially anything on the farm that I only used spasmodically. If it sits for a month it was buggered . Now in all those I have Lithium batteries doing the same job without modifications and all working every time for now . I will let you know how it is in 10 years time. Edited 2022-02-15 05:14 by bob.steel |
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| mab1 Senior Member Joined: 10/02/2015 Location: United KingdomPosts: 151 |
you do seem to be talking about yourself here  I rest my case:- my last car battery was still going at 10 years when the car was written off; the tractor battery (2nd hand) is at least 12 years old and can go 6 months between startups - still works fine even in midwinter; my offgrid agm battery was bought 2nd hand in 2005 - still going. I guess the problem you have with lead acid are lack of knowledge of how to maintain them. No- one is suggesting lithium don't work - but have you had them going 10years yet? No? Then I'll wait til you've proved them before i replace my 12 +yr tractor battery, or my 17 + yr old house battery. |
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| bob.steel Senior Member Joined: 27/02/2020 Location: AustraliaPosts: 188 |
Mab1 -You just want to spoil things for other members of the forum . You don't speak for them and I wish you would shove it where the sun dont shine sunshine. You are full of bullsh*t and you know it ,trying to justify Lead acid . Thats just garbage . |
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| Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406 |
Look in the mirror Bob. That is where all the bullsh*t is coming from. Cheers, Tony. |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5012 |
Enough. The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| bob.steel Senior Member Joined: 27/02/2020 Location: AustraliaPosts: 188 |
Now Tony . I figured you for a far more sensible fellow than that. I've followed a lot of your work on here . Ive been working on Lithium batteries since 1991 at James Cook Uni in QLD Australia. Iv'e gotta say i know my stuff with Lithium. Its a shame I can't get to impart my knowledge to you but obviously the frustration of not getting through to the deadheads leaves me disappointed . Et tu Brutus. Shame |
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| Gizmo Admin Group Joined: 05/06/2004 Location: AustraliaPosts: 5012 |
I have disabled some members accounts to give them a chance to cool down. When I say enough, it means enough. The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| pd-- Senior Member Joined: 11/12/2020 Location: AustraliaPosts: 122 |
Winston Lithium have been good for me so far 6+ years and 27mw of energy out Photo is from before my swap to Batrium bms  The console for the house power system  The best thing about the lithium's is that you can just fill them up quickly and in winter you do not need to worry about having them at partial charge for extended periods of time |
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| bob.steel Senior Member Joined: 27/02/2020 Location: AustraliaPosts: 188 |
Thats pretty good stuff hey! Similar reports from Boaters with 8 years up and 90% capacity at least left. Are the first sensors A123? |
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| pd-- Senior Member Joined: 11/12/2020 Location: AustraliaPosts: 122 |
ev-power Perth Australia https://www.ev-power.com.au/lithium-bms/ |
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Revlac Guru Joined: 31/12/2016 Location: AustraliaPosts: 961 |
Pd What is the difference in balance current between the original balance boards and the new Batrium bms boards? I know a Daly BMS will balance 20 or 30ma depending on which manual is available to read, for the first year this has been adequate (Average voltage 3.387 Differential voltage 0.046v Balance active only while charging), but later it will not be enough, all I have read about them is the will need more as they get older, bit too difficult to judge when and how much because all battery manufactures would be somewhat different as expected. Voltage sag under load is minimal I guess. Cheers Aaron Off The Grid |
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| pd-- Senior Member Joined: 11/12/2020 Location: AustraliaPosts: 122 |
The original evpower units where rated at 2A, typically they would shunt 1.5a https://www.ev-power.com.au/product/bms-cbm400/ There an analog unit so at 3.5v ( 3.6v for the older units) the shunt transistor starts conducting and at 3.7 to 3.8 V they would be shunting ~1.5A The Batrium units are rated at 1.98 A The Bypass current is programmable i have my modules set on 1A and have added heat sinks to the modules to increase there reliability you would need forced cooling to run them at higher amps and keep them reliable. They support a number of different balancing strategies. my current setup is as follows if battery is charging and charge amps < 45a and SOC > 99.5 and cell voltage > 3.35v and cell voltage difference > 0.02v then enable balancing. Time will tell if this needs tweaking , but there is ample balancing capacity left. my forced cooling setup is nearly finished , it is activated by the temperature of the bypass modules |
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| Revlac Guru Joined: 31/12/2016 Location: AustraliaPosts: 961 |
That's a much higher current than I was expecting, it should easily accommodate for future cell differences in future use. I just checked some settings on the one here (common port type), balance start at 3.2v balance differential at 0.05v Thanks, this is very helpful.  Cheers Aaron Off The Grid |
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| Revlac Guru Joined: 31/12/2016 Location: AustraliaPosts: 961 |
Possibly another option for keeping some batteries balanced. https://mppsolar.com.au/product/maxxcell-battery-balancer-t2/ Cheers Aaron Off The Grid |
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