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Cell price drop

I did purchase 16 cells from Gobel during the special. Should be here within a week. Price was $1319 with payment fee. Free shipping.

I couldn't pass that up.
 
16 REPT 280 received in perfect condition. (Ran out of room for other 4 on the washer). Tempted to just series them up now and go bare to 57V.

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Nice large contact area for the bus bars, make me glad I didn't get the Battero Tech

Mine are out for delivery, I'm stuck and work and there are some bad storms brewing. I'm glad they are packaged well, I have no concerns if the boxes get soaked.

I was thinking the same thing last night, just charge them up and use them. I can add a balancer later if they are way out.
 
Mine are out for delivery, I'm stuck and work and there are some bad storms brewing. I'm glad they are packaged well, I have no concerns if the boxes get soaked.

I was thinking the same thing last night, just charge them up and use them. I can add a balancer later if they are way out.
I met my FedEx driver at the top of my driveway told him I'd take them from there. wore me out going up and down lol. Super well packaged, plenty of room for intrusion without damage, there was one hole I was worried about but only the lightest impression on the outer foam. Basically FedEx can play their football games without sadness for us.

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Just like prior Docan purchases, no issues.

Paid Monday night.
 

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Thanks ordered that and their crimping tool

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I like to use the non self locking, non serrated, stainless nuts. The serrated nuts tears the crap out of the ring terminals and actually loosen more after a few days than the smooth bottom. I’m guessing that the high points sink in easier than a wide surface in copper. I’ve also noticed better torque retention on other surfaces like buss bars both solid and flexible, lugs and washers with the flat bottom nuts. I’ve also tested Belleville washers from several sources and all have a disappointment. They were made of 18-8 or 304 stainless and flatten out having virtually no residual pressure holding pressure holding a buss or lug down if a nut is loosened. In most cases it’s just better to not use a washer under the nuts. If I could find Belleville washers made of spring steel at a reasonable price and known quality I might rethink it. Don’t use Nord Lock (wedge lock) washers on your terminals! These also sink into copper and loosen torque in time so you need to re torque, but the surprise comes if you ever need to remove them! Total pucker time wondering if the stud or grub screw is going to snap or rip out😲 They do ramp up and get thicker when turned counter clockwise, hence only get tighter. Bottom picture is what happens to a ring terminal with a serrated nut. I hope you guys check the torque on your terminals after a few days, I have yet to find one still tight. Even weeks after, again they still move.
Link to nuts; https://a.co/d/2mc2oE8
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Got the ring terminals and crimper, for some reason I thought it was going to be difficult, no worries.

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Also picked up this Bluetooth thermal label printer for $10, so I can keep track of the cells. Thinking one Excel sheet per battery. If I get to 99 batteries that would be minimum of 1.4MWh and I don't see getting beyond that.

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Labeling makes things easier later. I use the JK to do the initial balancing however I help it along with a power supply to boost the low and a long roll of wire(resistance) to pull down the high cells. The labeling is priceless for this and it’s done in a few hours.
If you can reduce the font size you can put little labels inside of clear heat shrink. I use a pointy tweezer to position it. Print extra for when you loose one. Remove the backing before cutting, don’t leave it on because it crinkles later. Under score number 6 & 9 so there’s no confusion. I fold the little JK balance leads to fill the eye better even with the good crimper. A dab of 60/40 solder seals the end where the heat shrink can’t quite do.
PPCLION (Amazon) makes great 1/8” heat shrink that’s pliable after shrinking and is a great strain relief too. IMG_1506.jpegIMG_1507.jpegIMG_1508.jpeg
 
Got the ring terminals and crimper, for some reason I thought it was going to be difficult, no worries.

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Also picked up this Bluetooth thermal label printer for $10, so I can keep track of the cells. Thinking one Excel sheet per battery. If I get to 99 batteries that would be minimum of 1.4MWh and I don't see getting beyond that.

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Would you mind checking if that label printer will work without an internet connection?
I have an old brother with a keyboard but this would be was easier to use on my 'solar tablet' and I can charge it from solar 😁
 
Would you mind checking if that label printer will work without an internet connection?
I have an old brother with a keyboard but this would be was easier to use on my 'solar tablet' and I can charge it from solar 😁
Confirmed, doesn't need an Internet connection to print. It uses an app called Labelnize. It does need location access permission for the BT connection but that's pretty common due to privacy issues. App asks for login but you can skip, plenty of options and templates available as well.Screenshot_20240618_053439_Labelnize.jpg
 
Labeling makes things easier later. I use the JK to do the initial balancing however I help it along with a power supply to boost the low and a long roll of wire(resistance) to pull down the high cells. The labeling is priceless for this and it’s done in a few hours.
If you can reduce the font size you can put little labels inside of clear heat shrink. I use a pointy tweezer to position it. Print extra for when you loose one. Remove the backing before cutting, don’t leave it on because it crinkles later. Under score number 6 & 9 so there’s no confusion. I fold the little JK balance leads to fill the eye better even with the good crimper. A dab of 60/40 solder seals the end where the heat shrink can’t quite do.
PPCLION (Amazon) makes great 1/8” heat shrink that’s pliable after shrinking and is a great strain relief too. View attachment 222761View attachment 222762View attachment 222763
Great info thanks will have to do that on my next battery.
 
Confirmed, doesn't need an Internet connection to print. It uses an app called Labelnize. It does need location access permission for the BT connection but that's pretty common due to privacy issues. App asks for login but you can skip, plenty of options and templates available as well.View attachment 222799
Thank you. I'm ordering one.
 
Decided to put them together as 12V modules so I could use my ip22 charger to pop their full charge cherry, and also track how many Ah they take as a whole.

Yeah I know the alligator clamps but I have it set to 15A no worries. Targeting 14.2V

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Keep a very close eye on them when they get above 3.4V / cell.
You have a 48V charger, don't you?
Just set them up 16S, hookup the BMS and charge to ~55.2V then break them down and finish them off in parallel to ~3.65V
Just the 450/100 for 48V charging and I don't have enough daylight to get it done. Other than the 12V and 24V ip22 chargers.
 

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