DIY Lithium Packs, Proposal and Discussion
- Thread starter luthj
- Start date
hour
Observer
Gotcha. If that route interests you I’m happy to send you my code. Just need one of the BMS units advertised as UART, a breadboard, and three male-to-female breadboard jumper wires for gnd/rx/tx. Copypasta a snippet and you’re good. Maybe 5 minutes of work from unboxing arduino to toggling a relay based on voltage, then expand to whatever. Happy to help you get set up with remote monitoring and data logging too. Makes the monitoring/proving phase a hell of a lot easier
hour
Observer
yeah, you have to ask the bms for information (unlike Victron which just shouts in to the void 24-7). I haven’t dabbled with writing params and probably won’t. Do that on the bluetooth app then build additional layers of control on top of it. Doubt it’s hard to do
er edit... yes communication is bidirectional and has to be to query the bms for data, but I haven’t screwed around with changing params. Most I can do is turn charge/discharge on or off by code. Not change low cell disconnect, rebound times, etc
shade
Well-known member
I think he wants to be one of the few.
When it's time for me to install a more powerful bank of dilithium crystal batteries in my RetiredMobile, I'd like to do the same.
shade
Well-known member
I'm not sure if REC was mentioned, but they offer some of what you mentioned. No idea about prices, though.
www.rec-bms.com
BATTERY MANAGEMENT SYSTEM – REC BMS
www.rec-bms.com
shade
Well-known member
I see that Eric Bretscher of Nordkyn Design was going to release a production model of his BMS, but nothing is available yet. That might be worth an email to see where he is with it.
Protection and Management of Marine Lithium Battery Banks | | Nordkyn Design
Key considerations in the protection and management of lithium battery banks.
nordkyndesign.com
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shade
Well-known member
It's listed as out of stock, but he does have this rather cool looking alternator controller for sale, though.
VRC-200 Charge Reference Controller | Nordkyn Design
Advanced alternator and charger control for high-performance charging solutions.
nordkyndesign.com
luthj
Engineer In Residence
I just submitted an order for 8x 280AH EVE cells. I am guessing they must be surplus, as they were only 940$ shipped via ocean freight. I should have them in 30 days. Even if they are grade B cells they should work great for my application. I am still not sure on a BMS. I like the Orion Jr 2, and its programming software. The ability to use bluetooth and torque to view vital data is also nice. The datasheet shows an additional 1000 cycles can be attained with a "fixture". This appears to be a clamping/restraining plate which limits cell expansion during cycling. Makes sense as it reduces void formation and anode micro cracking.
I am still working on a mounting location. I think a sealed box mounted through the floor would work. With 0.5-1" of insulation the heating needs would be under 40W, which seems reasonable.
I am still working on a mounting location. I think a sealed box mounted through the floor would work. With 0.5-1" of insulation the heating needs would be under 40W, which seems reasonable.
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Hillbilly Heaven
Explorer
Link for ordering info please?
This outfit?
Eve Energy Co., Ltd
m.alibaba.com
Did you get a reco for them? What made you choose them?
Do please keep us updated how they do
Eve Energy Co., Ltd
Eve Eu Stock Price 3.2v 280ah Lifepo4 Cell Lithium Ion Batteries Solar Batteries Grade A 280ah Lfp Lifepo4 Battery - Buy Lifepo4 Battery Cell eve Lf50k Toys Electric Car Cell 3.2v Rechargeable Prismatic Electric Vehicles Lfp Batteries Lifepo4 50ah Ba
Eve Eu Stock Price 3.2v 280ah Lifepo4 Cell Lithium Ion Batteries Solar Batteries Grade A 280ah Lfp Lifepo4 Battery - Buy Lifepo4 Battery Cell eve Lf50k Toys Electric Car Cell 3.2v Rechargeable Prismatic Electric Vehicles Lfp Batteries Lifepo4 50ah Battery headway 38120 10ah 3.2v Lifepo4 Battery...
Did you get a reco for them? What made you choose them?
Do please keep us updated how they do
luthj
Engineer In Residence
Szxuba Ev Lifepo4 Prismatic Cells 280ah Lifepo4 Rechargeable 3.2v 280ah Li-ion Lithium Battery For Solar System - Buy Lifepo4 Prismatic Cells 280ah li-ion Lithium Battery 3.2v 280ah Lifepo4 Battery Cell Product on Alibaba.com
Szxuba Ev Lifepo4 Prismatic Cells 280ah Lifepo4 Rechargeable 3.2v 280ah Li-ion Lithium Battery For Solar System - Buy Lifepo4 Prismatic Cells 280ah li-ion Lithium Battery 3.2v 280ah Lifepo4 Battery Cell Product on Alibaba.com
This outfit?
Eve Energy Co., Ltd
Eve Eu Stock Price 3.2v 280ah Lifepo4 Cell Lithium Ion Batteries Solar Batteries Grade A 280ah Lfp Lifepo4 Battery - Buy Lifepo4 Battery Cell eve Lf50k Toys Electric Car Cell 3.2v Rechargeable Prismatic Electric Vehicles Lfp Batteries Lifepo4 50ah Ba
Eve Eu Stock Price 3.2v 280ah Lifepo4 Cell Lithium Ion Batteries Solar Batteries Grade A 280ah Lfp Lifepo4 Battery - Buy Lifepo4 Battery Cell eve Lf50k Toys Electric Car Cell 3.2v Rechargeable Prismatic Electric Vehicles Lfp Batteries Lifepo4 50ah Battery headway 38120 10ah 3.2v Lifepo4 Battery...
Did you get a reco for them? What made you choose them?
Do please keep us updated how they do
I got a few recommendations from over here.
Xuba Electronics: DEAL - 280AH LiFePo4 cells. Purchase & Review
Good Day Everyone. Based on Another Ongoing Thread (link) I made the choice to pull the trigger on purchasing 16 pieces, 280AH LFP cells from Shenzhen Xuba Electronics via Alibaba. Product Link. The order will be finalised on Monday Feb.03 due to new complications thanks to Murphy's Laws. So...
diysolarforum.com
DIY LiFePO4 Battery Banks
Advanced user discussion on BMS/ Cell Configurations/ Temperature Regulation/ Cell Sources and more
diysolarforum.com
Obviously not professionals, but the testing and reports gave me enough confidence to buy. At the price point, even if they are under capacity or have other minor issues (such as grade B), its still a good value. The seller indicates they are grade A EVE cells. They seem to be reselling a surplus from the regular production runs. As I mentioned there is no factory warranty, though the cells do have the EVE holographic QR code, which can be decoded for a production batch and serial number.
So I don't have any long term reviews, but for that price, its hard to go wrong.
Its also important to note, that these cells need additional protection. The aluminum can be dented or punctured more easily than the thicker plastic cases. The terminals can be spun if over torqued. They also need clamped to achieve maximum cycle life.
Hillbilly Heaven
Explorer
Good gosh $253 just for shipping 4 cells???