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I thought this deserved some attention: the forum just reached 100k users! Well done @Will Prowse and everyone else contributing to making this place excellent!

There are too many people asking general questions in the profile posts. Please don't! Just write them in the forum and you'll likely get answers from multiple people. Asking @Will Prowse or others in their profile won't get you any response. Maybe we should make this a sticky, or add it to the...

... than to go into discussion with SFK on Andy's YT comment section. For context, the issue is that the JK (new one) resets its values after x amount of time un-powered. This is a bug, obviously, and the reset values of 4.2V per cell are very bad for LFP. So SFK commented under the video...

Time to do a another calculation again. (previous posts here, here and here) - but this time, I will go cheap (but with cells available in Europe - I'll do an international Alibaba version at some point). Disclaimer, as usual: I mention vendors below and use them as an example and as reference...

It seems that cell prices are starting to really drop - for those of us in Europe: https://www.nkon.nl/rechargeable/lifepo4/prismatisch/envision-ess-4lh3l7-280ah-lifepo4-3-2v-b-grade.html Under 70 Euro per cell if you buy 16. Granted, they're not in stock right now, but I'm hoping this is a...

After making a couple of posts detailing the costs for DIY LiFePO4 based on a couple of popular vendors, I though of making one that uses cells available for purchase in the EU, with only the BMS from Aliexpress. Disclaimer: I mention vendors below and use them as an example and as reference...

As some of you may know, I'm in the process of moving my batteries into a new enclosure. Reasons: it's more organized, space is better optimized, and I can add more batteries more easily later if needed. This is the first time I took these apart since I built them somewhere early 2020. I bought...

Thought this would be a video to add to the list here: Let's speculate what happened.

Ok, this has been grinding my gears to the point where I'm annoyed with it, so I just wanted to write it down here. I see statements like this all over the net when it comes to cell capacity testing: - "you need to divide the Wh reading by the nominal voltage of 3.2V to get the real Ah...

This is a recalculation based on the situation today, of what I did last year. Disclaimer: I mention vendors below and use them as an example and as reference. This should not be considered an endorsement of said vendors! Let's start again with leveling the playing field. The EG4 is a 5kWh...

All, For various reasons, I'm going to take a break from the forum for a while. I'll still be around and do some moderation tasks, but I'm not going to actively participate in threads for the time being.

Hi all, I'm looking for one (or a few) LF280 (not N, not K) cells for some testing purposes. Anyone in Europe have them for sale? The LF280 ones are the ones that had holes drilled by EVE in the terminals. They're hard to find anywhere, and the ones on Aliexpress are mostly wrong, a scam, or...

So I ran an experiment where I deliberately overcharged two 105Ah LiFePO4 cells (to around 3.9V or so) until they got swollen. Then I just let them sit to see what happens (didn't discharge). Now, almost 6 months later, the swelling is all but gone. Next step will be to do a capacity test and...

Disclaimer: I mention vendors below and use them as an example and as reference. This should not be considered an endorsement of said vendors! In light of Will's recent video and some of the comments both there and on the forum, I thought it would be a good idea to do a full cost analysis of a...

Appropriate fireworks ;) All the best for 2022!

I just wanted to mention that the Hankzor store on Aliexpress has the JK BMS with a screen option. It also has a power button on the screen to easily turn the BMS on and off. This means no more messing about with 9V batteries or power supplies to turn on the BMS. It seem that Hankzor is the only...

Ok, I need to get this off my chest. It's been bugging me for some time now, and a recent YT video made it worse. Terminology matters. A lot. In engineering, words have specific meanings and these terms help us communicate ideas and concepts correctly. When people start assigning other meanings...

Ok, so, it seems there is quite a lot of confusion regarding this. I've spent the past day or two replying to several comments both here, on Reddit, and on YouTube, and Will made it a sticky on his latest video as well. Only compare Ah ratings of a battery between those with the same nominal...

I'm posting this as a response to a comment from Paul F. Note: mR == milliOhm. Hypotheses I proposed: MG Chemicals 847 can lower the resistance in a connection between bus bar and battery terminal, especially in cases where limited torque can be exerted, or where the two connections are not...

I've had numerous requests over the past year or two asking for more details regarding my set-up, how I built my place, what the requirements are for off-grid living in a cold climate, building materials, etc. Several people asked me to start a YT channel... I don't really have the time for...

I came across this: https://community.victronenergy.com/questions/76159/victron-venusos-driver-for-serial-connected-bms-av.html This might be interesting to those wanting to integrate one of the BMSs mentioned in the title into the rest of their Victron set-up.

I'm writing this post since it seems there is a lot of confusion (especially in the comment section of a certain youtuber in Australia) on why both MOSFETs in a typical single port BMS are controlled individually and why/how this works when they're in the same series circuit. It will hopefully...

Power shortages in China will likely cause significant price increases as companies are forced to stop production. https://www.nsenergybusiness.com/news/china-electricity-crisis-2021/...

Considering the amount of users this site is seeing and the amount of people that are embarking on building their own battery (and the repeating issues we see), we thought it would be a good idea to compose a clear and concise recommended (best practices) document. This document would explicitly...

So most of you know I have excess power in summer and early autumn, and one way to store energy for winter use is using the excess solar to process wood (cutting/splitting). That way, no fuels are used and the sound levels while processing are much nicer as an added benefit. One other way to use...

If she did not have that fuse, this would have been a lot worse... Definitely worth the cost of the Class T fuse.

We had a partial eclipse yesterday; took this picture: A quick and dirty graph of the impact on solar output. The sky was clear the whole day, so it was excellent to see the impact.

Don't know if you noticed, but this forum is going to hit 20K users in a day or two! @Will Prowse Nice!

I run a little project to buy up forest in the area to prevent it from being logged, and to turn it into natural forest again. The situation with COVID actually meant that quite some property comes up for sale, so we take advantage of that. Going from tree farm to natural forest takes time and a...

So after running my 32 EVE cells for the past 6 months I decided to pull my weakest cell and do a capacity test. Tester used was a CBA IV, at 20A discharge (can not really do a .2C test right now). Result: Ignore the bump at the 50Ah mark, I tightened the nuts better around that time - but...

Recently I got into discussion in the comment section of YouTube (I know, I should know better) of a video posted by @Off-Grid-Garage. Topic of the video was capacity testing and why voltage does not matter when doing this test specifically when measuring Amp-Hours. After some people still...

Damn, I just noticed I made my 1000th post on here. ?

Keeping in line with the whole low-cost solar system, building my own braided bus bars, etc. I thought I would see what it takes to build a low-cost ground mount for those 500W 96 cell panels (1310mm x 1956mm). My goals were to make the whole thing simple to build, with minimal tools and simple...

I'm just venting here, ignore. So, I just got permanently banned from /r/solar on Reddit for posting my build details for the under 10K Euro system I'm building. This is the sub post in question: All I link to is my blog entry with the description of the components, where to get them, and...

So, instead of just doing the usual and buying some Victron and Batrium equipment and calling it a day, I went shopping on Alibaba and Aliexpress to see if I could build my entire 32x280Ah and 10kW solar panels system for under 10K Euro, keeping in mind the power and charge requirements - so not...