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If you are getting up to 200amps then it might be worth it if done right. Have you just got 4 cells in series?

How do you mean diminishing returns? I've been using wire/lugs for busbars on an 2p4s of 280ah eve cells. Yes resistance is slightly higher, but 6 months of charging at 80amps(6hrs) once a week and no weird things going on at all, BMS voltages are milliamp correct, ∆ stays between 5 and 10mA...

What current are you wanting the busbars to carry? According to Amy, these welded studs are rated at 200amps, rating is worked out very differently from cables. If you have seen the contact area in high power relays, you will know how small they can be. Unless you are wanting to draw 1C it's not...

If you think you want 24v in the future then there is nothing wrong with using a converter until you get the rest of the batteries, as long as you can source a converter that is rated for your needs and doesn't have too much of a parasitic draw or inefficiency that will drain your system too...

Should work great as long as you have proper crimped lugs.

I'll be using EPDM rubber sheet, but the pack will be bolted down, so no fear of any movement.

How do you make ends? Tinned? Properly crimped? I'd love to make some but couldn't sort a good process in head.

True, but judging by the comments by most folk on here, they research things to excess, me included.? A decent 10tonne crimp can be had for under £30 these days. I bet those cables were impressive, and expensive. ?

Looks good. I really like that aluminium box. For anyone questioning cable lugs, which are deemed as gas tight: As a gas-tight connection is one where the conductors and connectors are so tightly deformed and compressed together that there are no cavities between them. Neither a liquid or a...

Very good points. Re the cable lugs, considering the reliability of the cold weld in a properly crimped good quality lug and cable in a dry environment, I really don't see it as a problem unless you are working with huge amps. Every system has its issues and weighing it up solid busbars had...

Yup you are right, I don't work in awg, wrong line on table. And I'm just going on the manufacturer spec for welding cable. It's still above my usage. I don't have to match my cable to my BMS as it's an electrodacus. So it's sized for the cutoff relays and fuses, and I'd argue just because you...

The wire is 25mm² (2awg) welding wire, it's spec'd at 170amps nominal from the suppliers. And the pack is 2p4s, so theoretically if the cable between the 2ps was bigger it could handle 340amps, but I've used 25mm² there too. I'm not sure I would trust it drawing anywhere near that, but it's for...

My only concern is that copper can carry a lot of heat away, but hopefully the delta would stand out against the other terminals. Is a fun add on to the project that I'll fully delve into the raspberry pi monitoring side when winter comes around. The sensors are made though, glued into...

I've used DS18B20 as they can be chained together and read digitally via the raspberry pi. I needed 16, and reading 16 analogue probes would have been a right PITA.

Interesting idea. My approach when I get my pack up and running is there will be a temperature sensor on each terminal logged through an RPI. I don't know how effective it will be in assessing small changes as the heat may be sinked too quickly, but was implementing it more to monitor for bigger...

My first experience of assembling a pack of eve 280 cells on the bench and charging absolutely schooled me in solid bus bars being potentially bad. My experience is going to go against the grain of thinking a clamped pack minimises terminal strain. My 4s pack was clamped between 10mm aluminium...

I don't know if anyone else saw that I asked Amy what the current capacity of the welded studs are, she said her supplier has them rated at 300amps, I'm not sure if that's realistic, but the more I think about it, the more I think the contact area can probably carry a lot more than we think it...

If your microwave is drawing 10amps, that's about 1400w draw including inefficiencies. Surge could be 4200w to 5600w at startup. If other stuff runs fine from the inverter then id say it's underpowered. Is it pure sine? What size are your cables to the inverter from battery and how long?

I'd be more worried about the stability of the glass than the output of the panel. I've not had first hand experience of damaged solar panel glass, but I do know it's tempered glass, which tbh I'm surprised didn't shatter when you drilled into it. I'd be worried that with expansion and...

Exactly, wherever the weakest link is, be it the terminal to stud weld, or the stud face to busbar. Whichever way you look at it unless someone has some real world measurements, to me the welded studs look very inferior in terms of current capacity (ampacity or current density, whichever...

I'm trying to asses the current capacity of the terminal face to busbar, not the busbar itself, thats the limiting factor. It's no different to calculating busbar capacity, which is cross sectional area X ampacity(Current density)

This question has come up in relation to the welded studs that Chinese suppliers are shipping their Eve & Lischen cells with these days. It would be great if those of you with more technical knowledge could expand on my limited research (googling) The welded studs are reported to have a 10mm...

Unless you are drawing very high continuous currents I doubt temperature would be a problem. It's clearly specified by the manufacturers that compression of lifepo4 prismatic cells will extend its cycle life. The industrial made battery packs for electric vehicles have a special foam between...

Good find. I'd like a closer look at one of those packs, I'm assuming the yellow stuff is some kind of foam as mentioned in this thread: https://diysolarforum.com/threads/another-cell-compression-thread-this-time-about-foam.16537/ In relation to eve lf280: The pressure on the terminals was the...

I hope they all test out ok. I have to say that aside from the general differences in the idea of customer services between China and UK/US/EU, Selina at Xuba did communicate well and resolve the problems in the end. Just took time and firmness. From what I can tell to they are only getting...

So, to update on my situation with the 4 cells I ordered from Xuba. Some will remember that they all arrived fully charged, with one dented. The dented cell will only charge sometimes, on occasion when fully discharged, on charge the voltage will rise rapidly to 3.65v while other cells are at...

Personally I see a BMS as an insurance policy for my investment, I don't want to be worrying about being there to turn loads off, and what if I accidently leave something on and I'm not there, dead cells. Or is one cell decides to run away when charging, even if the charger is set right, a...

I've sprayed my aluminium, however the plates shouldn't be connected to either terminal.

I thought the same, great idea but beyond my patience at the moment, although have thought about using pourable epoxies for other projects, it looks fun. I think the black end plates and spacers with the red springs will look good, shame it's going to be hidden in a locker on my campervan.

These are new eve from xuba, but my problems have not been experienced by others, at least not in this forum. I've not heard of the grading scale being used, I would be interested to know what the grades stand for. Why do you think the eves are better? I've not looked into the lishens yet.

Epoxy did cross my mind too, but I need to draw the line somewhere. ? While the pack is up on the bench, I might try some 1mm neoprene sheet I've got lying around just to see how it holds up over time. The way things are going, these cells will be replaced, maybe the lishens are flatter.

How do you mean ambitious? Thanks, Sprayed 10mm aluminium plate. The surface had a slight texture.

Even with short runs of 6mm² cable from load tester to batteries, the difference between what voltage it displays on the screen and that at the batteries is 0.3V, so I set the cutoff to 2.2V and that works too get my batteries down to 2.5V That's pulling around 20amps

Yes they were at pretty much 3.3V, but as said it indicates quite a wide band of charge. It is a shame not to squeeze out 280ah, I assume you have adjusted load tester for voltage drop?

Thanks for that.