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I'm a newbie and already own an SBMS40 that I'll be using for my next project, but this would've been a great resources as I was learning. I view the BMS along the lines of an obligatory car analogy: while one could certainly drive a car by using a dashboard of knob, levers and switches to...

It's for small units (portable) where size/space is a constraint. Not every use case has the luxury of unlimited space/weight for more batteries and more panels. When some variables are limited, it's reasonable to want to save the 10-20% lost efficiency of an inverter if a straight-DC solution...

The video Bud posted 2 pages back from Bigbattery.com re: their Lishen batteries suggests otherwise (they're wrapping them specifically to insulate them electrically)

I think part of the problem is the number of contradictory guides, both in posts here and on Youtube. Conflicting statements about voltage, whether it's safe to do it in parallel, whether you must do them in parallel, or you should not do them in parallel. What voltage(s) to use. Whether you...

I think the problem here is when someone needs detailed technical info... there isn't an authorized/licensed, certified, trained, etc "EVE Dealership" with all the inside scoop. A more-accurate analogy would be if you have a technical question about your Onkyo AVR, but when you call Onkyo they...

I did,. And provided links to the accredited scientific research papers. Actually, technically LiFePO4 IS a type of lithium ion battery (look it up). I will concede that colloquially what consumers typically refer to as "lithium ion" are categories of lithium-ion batteries OTHER than LiFePO4...

So 8 years ago I started dabbling in solar, and envisioned a portable self-contained kit that I could take with me camping, to festivals, etc. It would provide me power to charge my phone, inflate my air mattress, run lights at night, and anything else. I figured I could cram a battery, charge...

I have done this for a project I was working on, although I haven't touched the project since 2021. I was surprised at the time that no one else had done this before as I too was frustrated by the complexity and was hoping like you to build off from someone else's code. But even emailing Dacian...

I found this: https://visforvoltage.org/forum/9972-thundersky-cell-orientation "it's to do with electrolyte level - however, it's not really to do with the safety valve. There is only a small amount of electrolyte in each cell. The plates "wick" the electrolyte so they need to have their "feet...

A portable battery power kit (charge controller, batteries, inverter, connectors, etc all in a compact box). It began with wanting an external display showing specific data I cared about but then morphed into all sorts of other enhancements as I came up with ways I could control/respond to...

Well I'll definitely be doing individual load testing on each of my cells once they arrive.

Something else worth noting (that Dacian mentioned to me) is that, although the serial port is technically 2 wires, because the SBMS can't/doesn't receive any data you can get away with one wire. There was also the necessity to opto-isolate or magneto-isolate the serial line between the two...

To do the math, I think we'd need to know the actual price of the AC fridge, the actual price of the DC fridge, and the exact model inverter to determine it's efficiency. There's going to be energy lost converting DC->AC at the inverter, depending on the inverter this could be significant, and a...

Cost and weight. Aluminum is 1/3rd to 1/4th the cost of copper, and 30% of the weight. But mostly cost. Those Yuans add up.

The SBMS will be inside of an enclosure. I'd like a secondary display to show some key data that's visible even when the enclosure is closed. I'll also have an RGB LED that indicates various statuses that's visible from a distance (and in the dark). I can also incorporate other data from other...

o_O Where the frack did I get that math? Yup, I botched that pretty badly. And I can't edit, so I am forced to submit to humiliation for eternity. :D 3.36KWh

It's crap like this which pretty much guarantees I'll own an SLA printer within the next 12 months. :D Nice work.

I have found Dacian to be extremely generous and responsive in filling in the blanks whenever I needed help above and beyond what the manual provided (or just interpreting what was in the manual). I wouldn't have been able to get as far as I have without all his email help.

Considering 280Ah cells (the most popular right now) can be had for just over $80/ea., that price on 90Ah cells is pretty much spot on for current market prices $/Ah.

The actual scientists with research experience and who do "have the equipment to do that kind of tests" have done the tests and the data and their conclusions contradicts just about everything you're claiming. You are incorrect about the purpose about the vents. You are incorrect about the...

I wish I knew. I'm just a newcomer trying to learn and make sense of things as much as I can so that when my batteries arrive I don't end up like the OP. Unfortunately I end up like the man with two clocks.

I'm a sucker for testing and data. I've seen a number of people post real pretty discharge curve plot graphs. I'm curious though what tools/software/means you are using to produce these graphs? I've love to do some myself. :) Bonus points if it's not Windows-only (I run Linux).

I'm sure it's possible, but I find that when I build something myself I end up wanting it to be better than an off-the-shelf unit, so in the end I am spending more. But I have a superior end result (better/bigger batteries, more jacks, bigger inverter, other better tech, etc). I'm trying not to...

I did, but on the SBMS there are two possible places where one might put this value. It's not clear if 3.4 would be relevant for both, if one should be the factory spec 3.65V, or something else entirely. (being new to this, it's not necessarily clear up-front how semantics for various things...

You should make a thread in the Show and Tell forum and post your pictures there. :)