I can’t imagine building a wall out of 18650’s.. you got to much time. ;-p
For the purist in me, do I have to remind everyone this board is called Second Life Storage. As in reusing what was going to go to a landfill to power our homes. The problem is that recycling takes time and effort. I understand that. I for one will continue the tradition of sourcing USED batteries, testing and constructing DIY batteries from what was going to go into the waste stream instead of buying ready made batteries that require little to no effort to construct into a working powerwall. If I wanted that I could go out and buy a Tesla or some other variation as it seems everyone is jumping on the PW bandwagon. https://www.businessinsider.com/rechargeable-battery-options-compete-tesla-2017-5I can't imagine ever doing it again !!!!
Do it anywayregulations really limit what i can do
... You know, in italian you read that 22 thousand 401, so that was my first read LOL... another 22.401yrs ...
If I do it again, and I plan to, I will definitely go LiFePO4.Lifepo4 to the rescue..
Did you find the cause for pack 51 dropping to 2.6v? and it happened in a short time period?Happy the BMS has my back last night- Cell 51 went crazy low - woke up connected to grid but not on fire so that's a bonus.
Yeah. I learned a WHOLE lot doing this powerwall. But, I would again like to up my capacity to 1/2 again, but I am just no longer committed to the 18650 form going forward. I am going to nurse what I got to make it last (hopefully) another 3 years. Then if or when I move (which is the plan), the new setup it will be LiFePO4 (or whatever new chemistry they have at that time). All those thousands of little cells just make maintenance a nightmare--and I welded mine with 32 AWG wires. No regrets (except for how naive I was at the start), but hindsight means you learned something.Batteries have been going for 5 years now, that's as long as I really expected it to run, I would say I've gone from 40kw useable to 25, with maintenance I'll get that back to 35kwh useable but it a heck of a job doing that much testing.
Today will be cycle 1192 on the oldest battery. 1192 cycles @ 36.3% DOD yearly average / 365days = 3.3yrs and no detectable loss of capacity so far. I'm 'wildly' optimistic about 20yrs (7,300 cycles). But we'll see if I live that long. I wonder if I start noticing capacity degradation it will happen quickly? like the discharge curve knee?Yeah. I learned a WHOLE lot doing this powerwall. But, I would again like to up my capacity to 1/2 again, but I am just no longer committed to the 18650 form going forward. I am going to nurse what I got to make it last (hopefully) another 3 years. Then if or when I move (which is the plan), the new setup it will be LiFePO4 (or whatever new chemistry they have at that time). All those thousands of little cells just make maintenance a nightmare--and I welded mine with 32 AWG wires. No regrets (except for how naive I was at the start), but hindsight means you learned something.![]()
Yeh, large format is the only way forward, but my new setup if I ever do one won't be in this home and will not be publicYeah. I learned a WHOLE lot doing this powerwall. But, I would again like to up my capacity to 1/2 again, but I am just no longer committed to the 18650 form going forward. I am going to nurse what I got to make it last (hopefully) another 3 years. Then if or when I move (which is the plan), the new setup it will be LiFePO4 (or whatever new chemistry they have at that time). All those thousands of little cells just make maintenance a nightmare--and I welded mine with 32 AWG wires. No regrets (except for how naive I was at the start), but hindsight means you learned something.![]()
1292 WOW! don't even know how many mine has done... but they are still doing it so happy with thatToday will be cycle 1192 on the oldest battery. 1192 cycles @ 36.3% DOD yearly average / 365days = 3.3yrs and no detectable loss of capacity so far. I'm 'wildly' optimistic about 20yrs (7,300 cycles). But we'll see if I live that long. I wonder if I start noticing capacity degradation it will happen quickly? like the discharge curve knee?
Its hard not to be 'grass is greener' with all the emphasis on LifePo4, but as in 18650, ensuring 'new cells' is difficult and $ still seems significantly higher. Folks like @LithiumSolar (e.g. source of deep/reliable info) just got theirs online, and hopefully over time we'll see if that they hold up or what the problems might be.
Thanks for the up-date.Well it's been a while, but it's time to update how the whole project is progressing.. TL;DR - Awesome!
View: https://youtu.be/PPXAb9zZtpQ