Does anyone need premium Li-ion battery to DIY your solar system?

JoeHam said:

The WZRELB has been in service a few years. I just got the Sigineer.

They will last until they don't! And then I will get whatever appeals to me at the time.

Compared to what I spent on batteries the inverters are fairly trivial.

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So now the battery does not server you well, i suppose never mind, a very competitive solution will be there.

@Fish Freak and all,

it took me some time to do home work on the BMS of 12V/24V and what has been used in the current most recommended battery. And i finally know where i should go. for those BMS you suggest and used mostly in this forum, are from China in fact. and the pros and cons are coming to me from many aspects all the way not only from the user but the manufacture as well. And the one i should go with has been determined already, since my target is to integrate the best-in-class battery and the most reliable BMS. In fact, i see many BMS solutions with bluetooth, wifi and GPRS, did add some value in somehow but not that particular important if the bottom line of BMS function has yet been done well. i noticed that the temperature sensor in many BMS solution has not been treated in good manner, e.g. the number of temperature sensor is few and the point it detect may not be able to reflect the overall temperature in battery pack, misleading the BMS the piratical working condition. This is not acceptable in a decent BMS design.

Therefore, i will go to the most reliable solution without too many so-called functional add-on. but it should not taken as i will never consider those function in future, just step by step.

Now, the most unclear parts are over (Capacity and BMS). the next step goes to the out casing and the external electrode port material and design. Can also suggest the material of out casing and the way of design external electrode port? really appreciate. Of course, i will go through the review videos from Will and the others. It turns to that Will @Will Prowse made many great insights in reviewing products. Once this been decide, the products will stand in front of you very quickly, perhaps before the mid of June.

Share you an interesting thing, i just found my battery tester in one review of Battle Born Battery from Will. No idea yet how good the performances of Battle Born Battery, at least the quality of the electric part can be guaranteed by my battery tester

Cheers

peter.w said:

the next step goes to the out casing and the external electrode port material and design. Can also suggest the material of out casing and the way of design external electrode port?

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Hi Peter,

Are you planning on building a battery in a case with BMS? And you would suggestions how to connect externally to the battery terminals? I believe the most traditional way is with screw holes...… preferably M8 size that go deep enough so one doesn't have to worry about stripping the bolt. Hopefully someone else will chime in here. As far as the case itself I don't know. Curious as to what you have in mind for the BMS.

Gazoo said:

Hi Peter,

Are you planning on building a battery in a case with BMS? And you would suggestions how to connect externally to the battery terminals? I believe the most traditional way is with screw holes...… preferably M8 size that go deep enough so one doesn't have to worry about stripping the bolt. Hopefully someone else will chime in here. As far as the case itself I don't know. Curious as to what you have in mind for the BMS.

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Yes, I will make the complete solution, preorder may come very quickly, will you be interested in ?
The best in class battery with the reliable BMS, And an affordable price. no kidding

@Fish Freak the Bluetooth problem is the power consumption itself, too large

Hi Peter,

I have not decided which way to go and finances will be tight for awhile. And I was really hoping to have some kind of access to the BMS. I didn't think Bluetooth consumed much power. I am curious if the batteries will be able to be hooked in series or parallel? Thank you.

Gazoo said:

Hi Peter,

I have not decided which way to go and finances will be tight for awhile. And I was really hoping to have some kind of access to the BMS. I didn't think Bluetooth consumed much power. I am curious if the batteries will be able to be hooked in series or parallel? Thank you.

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@Gazoo ya, Bluetooth could be an add-on option, i will add it in, probably, in ver. 2.0

hooked in series is fine, the tricky part is in parallel mode due to non-balancing issue which should be controlled by BMS.

the BMS used in this forum mostly is should be called as protecting board, it is just a control board by only using hardware/micro switch since no or very few coding are integrated inside. therefore call it protecting board is more than enough.

the real BMS requires many coding embedded in the hardware, it has complete communication internally and externally by using ports like CAN or RS485, much more complicated. This kind of BMS has many set-ups in 2-level protection and balancing, therefore series or parallel mode won't be a problem. what i made in my previous 48V products are using BMS in this way.


but 12V/24V system used nowadays does not take too much attention from BMS companies, and developing period is a bit long for protecting board manufactures, therefore it looks like that the 12V/24V system is difficult to set in parallel or in series. but i am sure BMS company will come into this market eventually . some already developed it but limit the usage within their own brand, thus seems costly.

what i am going to use will stick to the current condition, as it is also a time-consuming job for me to develop from 0 to 1. what i can promise is the BMS i will turn to will be a reliable one as i always put battery safety in the first place (the reason why i choose CATL battery). i will not take risk by leaving the Li-ion battery to an unreliable BMS or so-called protecting board .

thanks, friends here enlighten me so much.

Cheers

peter.w said:

@Gazoo ya, Bluetooth could be an add-on option, i will add it in, probably, in ver. 2.0

hooked in series is fine, the tricky part is in parallel mode due to non-balancing issue which should be controlled by BMS.

the BMS used in this forum mostly is should be called as protecting board, it is just a control board by only using hardware/micro switch since no or very few coding are integrated inside. therefore call it protecting board is more than enough.

the real BMS requires many coding embedded in the hardware, it has complete communication internally and externally by using ports like CAN or RS485, much more complicated. This kind of BMS has many set-ups in 2-level protection and balancing, therefore series or parallel mode won't be a problem. what i made in my previous 48V products are using BMS in this way.

Power Lite Series energy storage system by UZ Energy | UZ

Power Lite Series is a safe and versatile LFP battery solution. The battery design is compact and allows for multi-parallel configurations (up to 16 units).

uzenergy.com

but 12V/24V system used nowadays does not take too much attention from BMS companies, and developing period is a bit long for protecting board manufactures, therefore it looks like that the 12V/24V system is difficult to set in parallel or in series. but i am sure BMS company will come into this market eventually . some already developed it but limit the usage within their own brand, thus seems costly.

what i am going to use will stick to the current condition, as it is also a time-consuming job for me to develop from 0 to 1. what i can promise is the BMS i will turn to will be a reliable one as i always put battery safety in the first place (the reason why i choose CATL battery). i will not take risk by leaving the Li-ion battery to an unreliable BMS or so-called protecting board .

thanks, friends here enlighten me so much.

Cheers

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Looking forward to what you come up with @peter.w !

Peter,

just so i am clear, whats the life cycle stated on these cells your using?

Ryang said:

Peter,

just so i am clear, whats the life cycle stated on these cells your using?

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i put my partial spec here for reference, the final one would be slightly different. i am coming up with the final product.
Really busy recently



Cheers

@peter.w I am still waiting for your sales team to contact me with pricing information since May 22.

JoeHam said:

@peter.w I am still waiting for your sales team to contact me with pricing information since May 22.

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@JoeHam Just push them to contact with you
My bad, as i was a bit overwhelmed recently and take it for granted that my team will contact you after i give them the info.

Cheers

peter.w said:

@JoeHam Just push them to contact with you
My bad, as i was a bit overwhelmed recently and take it for granted that my team will contact you after i give them the info.

Cheers

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In contact now, thanks.

@Fish Freak Hi, Guys, just released, in factory mode. suppose i still make it as i promised it will be ready at mid of June.
anyone interested in, pls drop me the message, and more details will share with you .



Cheers

Can we DIY get our hands on just 4 of those 3800 cycle CATL LFP cells? What is the rough price of the bare 280ah cells? Just trying to get a rough idea on the difference in premium vs diy grade.

Other questions,
What are the dimensions & weight of the 280ah?
Only info I can find on CATL LFP is from this site:
Can you get the CATL 202ah cell?
Any basic solution you can supply to fully covering the top of the cells from short circuits?

thanks

JoeHam said:

In contact now, thanks.

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In June your team promised more information.

I have not heard from them since.