Bought a battery box from Luyuan after arranging everything with Amy.
Scattered notes:
. Amy is an excellent communicator;
. 45 day shipping deadline from China to Europe was not met ( I think that it took 10 more days)
. Box looks fantastic!!!
. Quality seems top notch
. Customization was...
From your list, I would buy only from Luyuan - consistently a good supplier.
Expect a delay on top of their claimed timings (+15 days in my case).
Would buy again (battery box in my case), but would also buy cells.
Search for Docan here in the forum... yes..., YouTubers have more luck than...
Yes, the screen cut out was slightly pushed in. As I won't have one, I'll push it back to its original place.
M6? I guess so. Those are the LF280k v2, A grade.
Thanks a lot!!
Totally understood!
It's incredible how included instructions don't pair up with the product , not even the marketing material... it's only good people like you and the ones in the forum that make all this work.
Again, thanks!
Compression is described in the cell's datasheet.
(pressure, method, materials, SOC)
As I don't have the equipment to measure the correct compression at the given SOC in a fixed fixture, I'll go with springs, which are rated for a given force.
Hi!
I'm extremely interested in your setup. Thanks for sharing!!
I'm also after a 150A - 200A BMS that could talk with the Victron MultiPlus-II 24/5000/120-50 / Venus OS.
I need to buy one or two of such BMSs as I'm waiting for 8x LF280K for a 24v battery, and after this I'll make another one...
Being in mainland Europe I'd only buy from NKON or Amy at Luyuan.
The first due to warranty and good, consistent feedback, the later for price and feedback.
Amy seems to have some interesting battery boxes, though I would check if they properly compress cells
Regarding the Seplos, there is an ongoing thread on it and clearly talks to Vitron, though at buying time you have to specify that (there are 2 versions, only one works with it).
It seems it doesn't publish DVCC, though
Once again, thanks for your view on the subject!
In order to be comparable, I think that a breaker and a battery box is mandatory.
We want similar end results.
I'm having second thoughts about using B Grade instead of A grade, as that is what I would expect inside SOK's batteries.
Again, there...
Thank you very much for the detailed information.
I'll cross your breakers' reference # and confirm that they are all non polarized, as those prices seem quite interesting.
Again, thanks!!
I'm thinking on Luyuan's, that is around that price point, delivered.
I'm about to get 2 of those, but if something more... interesting/ cheap / better specced appears, I may in for that...
Just for newbies future reference, don't forget that EVE (and also CATL??) recommended cells to be compressed in order to achieve declared longevity (cycles) in their spec sheet
I paid 183.55€ each, plus a total of 47.81€ for shipping, which will equate to (for 8 units) around 190€each.
They always sell the next "Grade A" shipment even before they receive! it.
NKON sells mainly in Europe
https://eu.nkon.nl/rechargeable/lifepo4/prismatisch.html
This particular battery box holds 8 cells.
I also noticed that they made a mistake in the ad as at least once they refer to 48v and 16 cells setup, but it may have been an editing issue (copy - paste).
As you'll have to write Amy in the chat to customise the box to your needs, all details will...
Sorry for resurrecting this thread... but I still have some doubts related to it:
If I use these cells (EVE LF280k with double terminals) with an alu busbar - with the double of the original busbar size (don't know which alu type, tbh) - there should be no worries with dissimilar metals...
Please read your's cells datasheet.
Most probably if needed, it's described there.
For EVE 280k it's described as 3 rods each side, 10mm alu or wood (?), compressing on the larger side - IIRC
Howdy.
Just beggining with lithium - hence been lurking in the forum reading as much as I can - though with some previous DIY experience on solar, just for fun.
Been quite a learning experience around here!
I remember your tests, and I understand quite clearly your description, as I have used this arrangement for other purposes in the past, but... I'm not understanding JK's instructions on the heating pad! :(
I've just received a brand new JK-B2A8S20P-H
AliExpress instructions:
Provided cable...
These are my own Grade A bought from a reputable company (famous last words)
You can use it to check if you find any differences from yours.
If you need better pics, let me know
Thread
Nice!!
What have you used to make the schematic?
I'm starting drawing my setup, but I'm finding difficult to get the Victron components in a software that can make nice diagrams like the one you have...
Just found it.
https://diysolarforum.com/threads/seplos-can-bus-rs485-48v-200a-8s-16s-bms.20051
It's buried somewhere in the 40 page thread!! :censored:
If they're supposed to be "A Grade", brand new, than it's not your problem.
Something is wrong.
Compare to advertising pics and if different get all your money back
Another (quite cheaper) idea could be Luyuan's.
I've ordered one, but haven't received it yet, so I can't comment on the quality .
It's customised for cells and BMS
Hi.
Though I searched the forum, I was not able to find an answer for this:
In a van setup, fitted with a 12v electrical system, can I have a 24v house system with chassis as common ground? (no, it will not be the only ground!)
Van: Ducato / Promaster / Jumper / Relay (they are all the same -...
Hi Steve!
I know you don't have Victron gear.
But with the VenusOS you get a pretty nice interface/ central console.
I have not explored it myself, I'm about to, but what I see is an easy way to present all batteries to a nice GUI, easily accessible from anywhere through VRM / web.
Regards
Thanks for your lengthy response!
If you were buying cells right now, which cells (vendor?) would you bet?
(in my case, it's for a mobile application - campervan)
Hi.
My current multi meter only reads 2 decimal places in DC current.
Not the best for LiFePo4 cells...
As such I need a new multi meter, preferably quite reliable, and on the cheap(ish) side.
yeah... I checked a Fluke just for fun, and got quite scared with the 1k price tag
So, requirements...
Considering just "Grade A" cells (whatever that really means) from NKON or Luyuan, why choose one over the other?
(no horror stories, just facts, please, like # of cycles, costs, etc)
Thinking about a second battery bank (first being LF280k, still not assembled) for mobile application...
Thank you very much for your description!
I don't know much about pressure, pressure distribution among several pressure sources (double the number of springs means half the pressure each spring needs to produce for a constant pressure, or is it non linear?), pressure change along spring...
Regarding the SE 865-DCBRK-250, I was not able to find any info if it is or not polarized, and as such if it's usable in a battery bank as a disconnect switch (under load).
(Use case in 160 max amps.)
Where can I get that info?
Thanks in advance!
Hi!
Could you please send me a link to the springs you used in your fixture?
The picture's right battery seems to show them almost bottoming out, or is it just the photo's angle?
Thanks in advance
Thanks, @Alkaline , your response is appreciated as I know you've been tracking quite a few buyers. More food for thought...
I didn't though about the LF230, but as I'll have plenty of capacity with the new battery, maybe that could also be a possibility.
So now it's LF280k Vs 304 Vs LF230...
Many thanks for your suggestions and thoroughly description.
I'll investigate the units you mentioned.
Forgot to say that being easy to buy in EU was a bonus.
Again, thanks for your reply!
Hi!
How much is your box insulated, what kind of ambient temperature are they subject to and what type of cells are they?
Is overheating an issue with your setup?
I'm about to build a 24v battery based on 280Ah Eve cells for an RV, and I'm thinking about putting them in a metal box to prevent...
You agree on something.
You pay the price in full.
You receive a portion of what has been agreed.
Until new agreement is achieved, someone should be pi$$ed...
Bonjour @oliagri
Thanks for this table.
I'm not fully understanding it:
a) what is the unit of measure inside the tables? kgf? N?
b) I can't understand how a bigger spring is able to produce less force
c) what is the compression at which it will reach the maximum specified force
Do you have...
So why would they start at 30-40% with a given compression? Why bother with a given compression apparatus? (they have the schematics there)
I would believe that they make testing under optimal conditions so they can brag about the product and it's cycle / capacity results...
Thanks for all your info.
Having just bought a MultiPlus-II 24/5000/120-50, and seeing people on the web using such procedure, I'm right now trying to also understand why, and how.
How do you know your Multiplus is charged? Voltage comparation? How one do it manually?
Hi.
I'm about to build a battery (24v, 8x EVE LF280k, 200A BMS) to be used in a Class B RV (max 130A draw).
I'm thinking about putting the cells and BMS inside a metal box (in the garage, also properly insulated) to mitigate fire risk, but I'm fearing overheating could be prejudicial.
What is...
Hi
Be careful in the reconnection moment.
If you don't want to have huge current inrush, both batteries should be at the same SOC.
And this is one of the reasons why a Class-T fuse is (almost) mandatory
Even if the num of cells, or exact force they produce at a given compression is not accurate, the math there teaches me how to work out my own scenario.
Thanks!
Awesome having your feedback! I was reading through the thread's 19 pages, but haven't reached the end...
I'm between JBD and JK ( especially the latter due to the active balancing features) so I'm interested in your experience...
Was it easy to setup?
Does the GX uses DVCC?
Thanks in advance!
Hi!
Still reading as much as I can on Fast Acting Class T fuses as I'm about to start building my first LiFePo4 battery (24v, 280ah cells).
Could you please point me to the fuses and fuse holders that you're using (with success ) in your setup?
Or are they really created equally, unlike most...
Thank you so much for your responses, not only here but all over the forum.
Most, I just grasp the concepts, some I fully understand, but I always learn.
Again, thanks!
Hi.
I'm trying to learn as much as possible regarding DC load protection.
I didn't understand your remarks regarding the symbols and this switch. Where is the marking?
Does this means it cannot be used in a 24v LiFePO4 system under load? (max 160A in my case)
Thanks in advance!
Maybe those are questions to these thread?
https://diysolarforum.com/threads/victron-venusos-driver-for-serial-connected-bms-llt-jbd-daly-smart-ant-jkbms-heltec-renogy.17847/
Sorry for the ignorance, but shouldn't fuses be placed as near as possible to the source / battery?
The way you described, the circuit from the battery to the fuse is not protected , right?
@Nami ??
I'm about to buy BMSs for my long term living RV.
How can one trust this types of batteries for an RV??
One cannot afford to be hung without any power so easily!!
What have others done to prevent this??
Very interesting post!!
Thanks for sharing!
Please remember that what is in the spec sheet is 3 rods per side, which is ignored by most builders.
That will allow a much spread load...
Regards!
Thank you very much for your suggestions.
I ended buying the ANENG AN870 (due to cost considerations) and the UNI-T UT210E.
Again, thanks for your support
Setup:
- 24v
- 2 batteries (8x 280Ah)
- max consumption 160A (from both batteries)
Would you consider this 4 position rotary switch for your campervan?
(to be used as disconnect, or battery switcher, if maintenance needs arise)
I know that it's not the one in the forum documentation, but it...