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zakruti.com » Knowledge, science, education » GreatScott!
Make your own Powerwall (Big LiFePO4 Battery Pack)

Make your own Powerwall (Big LiFePO4 Battery Pack)

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Rating: 4.0; Vote: 1
Make your own Powerwall (Big LiFePO4 Battery Pack) kosio86: You forgot to top balance those cells, together before making the battery pack. This tiny BMS would never be able to catch up with balancing the cells if they are not properly balanced initially, and you will not be able to use the entire capacity of the battery pack. Just measuring that the voltages are the same upon arrival is not enough. One third of their capacity curve is 3. 33v, which is the storage voltage. You need to connect them in parralel and charge them together to the recommended charge voltage 3. 6v. If you are lucky s. o. did that for you before shipping
Date: 2020-09-05

Comments and reviews: 9


Think I am do this for my grandfather for his boat he lives in a colder climate but it's like he lives on is an electric only lake and he's been using lead acid for years and he's been having problems with them so I thought maybe lithium iron phosphate maybe a good replacement he needs 48 volts
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why do you need a complete BMS? if your installation is connected to the solar regulator you already have it (I mean, you don't have anything connected directly to the battery, it won't allow going under or over voltage. You only need the balancer, which is cheaper.
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500euros is too much but 460 isnt xD?
in the truth this price without the bms and another parts
so the total price will be 800 euros or more. its was only for led light and little smaller things like laptop or charger phone for 24 hours

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GreatScott: Screws everything together, nice and clean
Also GreatScott: SolDeRiNGg tHe wiReS iS A grEaT iDEa
NoHate, but pleaaasseee use crimp cable shoes and screw the cables to the fuse/battery

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Lead acid batteries are usually sized for 50% discharge only, that means you'll only draw 600Wh from it, for it to last. So an equivalent 18650 battery, would only need half the number of cells = 66!
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As always, even the old videos are great. I like that you went for a decent, but affordable, BMS. I am still not sure if you can use cheap Chinese BMS in parallel to avoid catastrophic failure.
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Nice! I think you can put the thermistors in between cells 1-2 and 3-4 (there seems to be a 2. 3mm gap. This way you sense all 4 cells and also sense the hottest part (the core. Regards!
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I'm no expert, but I read somewhere that you should squeeze the LiFePo4 cells together, so when they try to expand under load they don't break the terminals and the BUS bars: )
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Fore 4s 10amp Life PO4-Battery pack which type of BMS I need to use each one 3. 2v10A charge & cutoff voltage 3. 65vfloat: 3. 45V
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