PLEASE NOTE: If you had an account with the previous forum, it has been ported to the new Genetry website!
You will need to reset the password to access the new forum. Click Log In → Forgot Password → enter your username or forum email address → click Email Reset Link.
I guess people are moving away from lithium ion batteries because LiFePo4 batteries don't combust so easy.
IF your LiFePo4 batteries is 24v or 48v string then it is safe . Sandi is testing 800v DC inverter which mean 150 LiFePo4 cells connected in series . It is almost impossible for DIY to have every connection tight and if one connection is loose then the arcing will destroy 30000 dollars of LiFePo4 batteries like what happen on a youtube video . My lithium ion battery in in concrete box outside and the connection do get loose by the heat and current surge and I shut off the inverter and the measured temperature was 350 degree F and the battery will blow up at 400 degree F.
I guess people are moving away from lithium ion batteries My battery are lithium-ion and dangerous .
I have a used 52W 11AH ebike battery I keep on a metal shelf in my shed. It doesn't self -discharge, so the cells are probably good. Some people will check Li-Ion batteries for heat.
I also have a metal can out there with some old 18650 Li-ion cells from laptop batteries. Only 3 cells are first rate, and the rest are low grade. I want to build a 12V battery from the low grade cells just to practice soldering nickel strips as bus bars. Later, I will have enough first rate cells to build a 4P3S battery with a bms.
I also have a metal can out there with some old 18650 Li-ion cells from laptop batteries.
I do NOT recommend using these. Personal experience: it's not worth the risk.
Had one that had full charge capacity (2.2Ah)...up to 4.1v. If you took it to 4.2v, it'd get extremely hot.
Others would develop internal slow-shorts. Not enough to generate significant heat--but enough to significantly imbalance the pack. And of course, not enough to blow a cell fuse.
and the rest are low grade. I want to build a 12V battery from the low grade cells
Don't do it...unless you fancy rebuilding your garage.
I've culled out the really bad cells that heat up. The low grade cells that are left (they charge ok, but self discharge too quickly) are just for soldering practice. I want to link at least 3 in parallel. I may even try to build a crude spot welder. Once I do it, I'll recycle them. I will save the few first-rate cells that I find, and eventually try to build a Li-ion battery with a bms and cell balancing.
I don't keep any lithium cells in the house or garage.
26 minutes ago, RobertM said:The low grade cells that are left (they charge ok, but self discharge too quickly) are just for soldering practice.
We actually had a pack of precisely that kind of cells start a fire during charge. Wasn't pretty.
26 minutes ago, RobertM said:I've culled out the really bad cells that heat up.
"Decent" cells can/will eventually turn into "heaters" as they degrade. Which is why I cringe when I see "powerwalls" with thousands of "recovered" laptop batteries in them...there is no way you will ever be able to catch a "new heater" 2 years down the road until the whole thing goes up in flames.
"Decent" cells can/will eventually turn into "heaters" as they degrade.
Yes. I'm wary of my 52V ebike battery.
I do NOT recommend using these. Personal experience: it's not worth the risk. Don't do it...unless you fancy rebuilding your garage.
I almost had to rebuild my bedroom 4 years ago . The case of 18650 Li-ion cells from laptop batteries is negative and the bus bar solder to the positive terminal touch the case and the short exploded the battery pack and was almost impossible to put out .
Your bedroom was no place to for a Li-ion powerwall. 🌋
Sean last week YouTube video indicated he wanted 4 of the gs12k inverters which would be theoretically 48000 watts continuous capable albeit in 4 separate systems so the gs12 inverter would not have to run at their red line... evidently they were running 10000 watt loads in their house....
4 gs12 inverters would cost a lot more than one 25k Sandi high voltage inverter let alone the huge amount of high priced copper wire and numerous cheap MSB MPPTs needed.???? but maybe they can make it make economical sense????
fan filters were causing too much restriction to the air flow and inverter performance and causing the inverter to run warmer....i suspected that would be the issue....
high performance PC use water cooling of the processor and quiet fans or ssd to decrease noise and improve their performance ( a different but similar problem of getting rid of the heat) issue....
a better air filtration system of the inverter room without the cat hair and dander would aid his system,,, and cool the room to 76 degrees continuously or slightly less...🤔🤔😎
still never a peep via skype from the powerjack-jack scam or via the ebayseller rayjunglepower.... so still looking for a replacement for the scam 30000 watt powerjack lf psw sp inverter vs the piece of paper they sent in a flat cardboard envelop and claimed they sent a 189 pound inverter....I guarantee you the USPS 70 plus year old mailman will vouch that he definitely did not ever deliver the 189 pound inverter...
hope Sean has better luck!
What are the chances that Ray, after years of providing Jungle Power solutions, started drinking heavily, and in a moment of desperation, simply mailed out pictures of inverters, then disappeared into the wilds of Borneo?
Your bedroom was no place to for a Li-ion powerwall
NO powerwall in my bedroom . I was soldering 18650 Li-ion cells from laptop batteries and the battery exploded . Now I do NO soldereing in the house .
What are the chances that Ray, after years of providing Jungle Power solutions, started drinking heavily, and in a moment of desperation, simply mailed out pictures of inverters, then disappeared into the wilds of Borneo?
A chance he may be the owner of PJ in China and will do that to Sean and now NO cruise to the bahama .
a better air filtration system of the inverter room without the cat hair and dander would aid his system,,, and cool the room to 76 degrees continuously or slightly less...
I have to do what Mike G do and put a 12 kw inverter in a shed cool to 70 degree F by a portable AC . That is the only way I can run a 4 ton heat pump after watching youtube again .
4 gs12 inverters would cost a lot more than one 25k Sandi high voltage inverter let alone the huge amount of high priced copper wire and numerous cheap MSB MPPTs needed.???? but maybe they can make it make economical sense????
I use 5 MSB MPPTs for 5000 watts of solar panels so 30 MSB MPPTs is probably is how many Sean need . Mike G in his later video say Sandi 30k and 400v DC system is what he will do IF he can do over again . A 12 kw inverter will need 4/0 welding cable at 48 volt and 250 amps but a 30 kw inverter will need awg 2 at 400 volt and 75 amps . Four 12 kw GS will need 250 amp each and 1000 DC amps total . The heat and battery for 4 gs12 inverters would cost a lot more than two 30k Sandi high voltage inverter let alone the huge amount of high priced copper wire . I like your math .