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I'll have to open it up and ee which version of the BMS I've got. I don't' recall seeing relays when I put it together. The parameters are programmable via USB connection to my laptop with their app.

Resistance between bus bars and battery seems unlikely, when I'm pulling 100A or so into the SkyBox inverter. Likewise when it's pushing 40A into the batteries. The out-of-balance groups switch up over time, too. If it were just resistance, it should be the same cell or group of cells...

Which dividend stocks that are not MLPs and don't subject you to market risk are paying 8-9%? (MLPs have tax implications and extra forms.)

I've got two of the EEL battery boxes. The first was assembled with 271AH cells and I recently built another with the Envision 304 grade B cells. The new one is the latest version of the larger box. It has had strange balancing issues. Groups of 4 or 8 cells are balancing to the same voltage...

Buy 20 and put the 4 worst into a 12V pack for 12V loads or smaller portable inverter. When I ordered from 18650 last year, there was a price break in shipping that made 20 better than 16 anyway.

Just saw a YouTube video where a guy tested bi-facial planted vertically E-W vs conventional and bi-facial facing south. Vertical E-W was competitive, and split the curve to provide power more in line with usage (anti-duck curve). Interesting results with snow, too.

18650battery store prices have come way down and they restocked. EVE 304AH at $109 at the moment. Wondering if they will drop a bit more from oversupply?

I miss going to this show. Used to get a free pass because I worked for a large company. So many great things to see and people to talk to. Once had a chance to chat with Chris Anderson and another well-known guy whose name I can't recall about DIY drones when they were just coming out with...

Should definitely have something between the cells. The case of each cell is tied to the positive terminal (on my Envision cells), so when you've got cells connected together, case metal making contact between cells will short out one of the cells. That blue PVC will insulate them temporarily...

The spec sheet on these cells says they are at 100% SoC at 3.348V. What voltages are you folks using when you test the capacity? I've got a 4-pack on a charger that goes to 3.65V per cell, still pushing its 10A max rate into cells at 3.36V each. OC voltage looks like it's going to settle...

Maybe I'm being dumb here, but it sounds like you just made a little transformer with the secondary shorted on each leg. AC going through the ferrite would generate a current if the ferrite is a closed conductor loop. That would generate heat in the ferrite and do nothing for quenching spikes.

Given this has been in service for 8 months without problems until now, yeah, looks like you've got 1 weak cell and 2 more than are on their way. Given the flat curve of LiFePO4, 11 looks weak as well. I'd consider replacing both of them. How many AH did you draw to get to that point? If...

Do these inverters use frequency-shift load management? I read through the manual and didn't see any mention, so I'm assuming not. I've got Enphase micros on some panels that I'd like to keep.

What settings are you using in the BMS? I've had mixed results with two EEL packs using the (I think) Seplos BMS If you want, you can just dump the XML settings file if you have access to it.

If it leaks out when the cell is punctured, it has not had time to absorb any moisture. So what's leaking out is not HF acid. It might be that over time it reacts with moisture from the air, but not instantaneously.

Someone posted a doc with the composition of the electrolyte in LiFePO4 batteries. Don't recall HF acid being on the list. It was in the post about the battery pack in Germany that was suspected in a house explosion. Edit: went back to find it. The reference is about Li-ion battery...

All of mine were slightly bloated, but I was able to fit them into an EEL box. I tipped the box up on its back face so the weight of the cells helped take up the slack so I could put the front plate on

Interesting. The listing still says "Re-stocking soon" and the price dropped to $75. Maybe they changed their minds? You would think they would just remove it if they were dropping them entirely. They aren't a lower grade of other cells they sell, so it's not as if they are testing them as...

"Yes, primarily comprised of hydrogen." No, they are not primarily comprised of hydrogen. Of the simple gases (CO, H2, CO2, CH4), which make up less than 10% of the total, about half is hydrogen. Less than 20% of the total is hycrocarbons. Fully 80% is "Other" in this report in figures 7 and...

Was just looking for info related to connecting an additional pack to an existing pack in parallel on the forum. This seems like the situation presented here with: "... is there going to be any problem with the balance if one battery goes offline and then comes back on later? Or will it just...

Has anyone seen photos that show the battery boxes?

I doubt they will restock the B grade. When I talked to Steven(?) a couple of months back, he noted that they are moving away from these. They don't make enough money on them.

Right, but I have not found a good (empty) battery box with 150-200A BMS w/ display for 16x 280-304AH batteries for less than about $600. Something less than $450 is a huge price drop from there. You can get a bare box with no BMS for that price for sure. Where are you getting them?

Where are you getting Seplos complete kit (less cells) for <$450? This is for 16x 280-304AH cells and 150A-200A BMS?

My torque wrench is set for 60 in-lbs. No problem on two full 48 v packs after installing and dissassembling a couple of times. Maybe mine reads high?

Clamp / hold down brackets, like Unirac, work fine with no other mechanical connection to the panels, torqued to spec. Mine have been up there for 13 years with Sharp 175W panels. There are some wind load calcs that you should do to check.

Are they fully charged? That's not smoke from the cell phones, those are the souls of those phones being crushed.

Is there a makerspace in your area that has welders? Ours has MIG, TIG, torch, and plasma cutter. Might be able to do it there or ask them to help you

I've noticed recently on several types of orders from China that the tracking number will show nothing, other than perhaps the order was picked up by the shippiung company, for a long time. Then *poof* either it shows up at my front door, or I get a notification from FedEx or another delivery...

Most folks here probably know this, but it fooled me a bit. I have been finger-tightening the nuts when I temporarily hook up the JBD BMS to 4 cells at a time to charge and top-balance. I noticed one cell in the current 4 was a bit higher voltage than the other three at 10A, so was thinking of...

Yes, exactly. I turned the box on its back end to use the weight of the batteries to help compress them while I threaded the bolts that hold that plate in place. In the end I was able to fully seat the front plate (edges to mating flanges on the box). As I mentioned, I had compressed the...

Photos, as requested

On the Envision B cells, one comment while top-balancing: I noticed that the voltage difference betrween cells is a bit more than I would expect while charging. I originally ordered 20 cells, intending to build a 48v and a 12v pack, so I can match cells if needed. I swapped out one cell...

My EEL box arrived. It's version 3. The case is redesigned, but the front panel is the same. The previous case had some shoulders at the front end that limited the width of the cells and would have made it MUCH more difficult to fit in my 304 grade B cells. I was even thinking of having to...

You could try calling them. When I mentioned this to Steven, he said there's a problem in the shipping calc. I also ended up picking a quantity that gave me the cheaper FedEx option. Shipping was pretty fast.