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What are these protection systems in place for the grid that prevent the DC current induced in the lines magnetically saturating grid transformers turning them into resistive heaters so if the power is not cut it burns them out (not with a huge current either, so you can't prevent it with your...

BTW, Amazon was mentioned recently. Sometimes when I find an expensive item on Aliexpress I definitely would like a proper warranty on I'll search for the exact same title on amazon, often finding it for the same price.

The (semi) final version. Semi, because I still have to get the cable grommets. One thing I'd do differently if I was starting again is to insert a piece of plywood under the cells. I don't trust the thin plastic bottom of the chest. When I was hoisting it down to my cellar I had to be extra...

IMO the easiest way is disc springs and threadlocker. There are online calculators you can put your disc spring dimensions in and how much you compress it. This gives you the force. For example I know when my disc springs arrive (1in diameter, 0.5in bore, 0.05in thick) I need to compress 20%...

The word on the can "Ogniochronna" means "Fire retarding" in Polish,but no, I haven't. Actually I might as I have some cutoffs etc. If people are interested I can make a video. I thought so too, that this thin plastic will flex and detach from the foam. It is a sort of experiment, but no. So...

Just to add to this. I found unused lifepo cells that are stored for very long in elevated temperatures mostly degrade by loss of "cyclable lithium". This is a scientific article that describes what happens when a cell looses its "cyclable lithium" https://www.mdpi.com/1996-1073/12/22/4386 It...

Haha, good. Thanks for confirming :) Thank for letting me know. That will make it a lot easier. Also, I stupidly didn't order more busbars. I didn't realise each battery comes with just one :-( So I'm currently top balancing 8 cells at a time. Yesterday I built this not very pretty...

Thanks. Is anyone surprised in Quebec out of all places they care more about these things? They've experienced a space weather caused grid disruption in 1989. So I'm not surprised people in charge od spec-ing their systems have it in mind. Just the fact they did this tests shows it. And yet...

They are dropping down. I think it may have something to do with the lower EV demand and perhaps lower demand in China overall(not just automotive). I just got my order of 16 Higee 280AH (new "A grade") cells delivered in 6 days (including a weekend :-o ) from a warehouse in the same EU country...

With a very expensive meter. At the time I hired two young guys who were learning to be electricians at a local technical school to do the wiring in my workshop. Initially it was just to do the wiring. I was going to do everything else myself. And I was going to hire someone to do grounding...

I've read this new (20230 study about desulfating flooded lead acid batteries with just high voltage DC charge. It is very interesting as they tested just overvoltage on desulfating flooded lead acid. Many a company sells pulse desulfators, but if all we need is a bench power supply - that would...

Seriously at 6V voltage drop? One could argue over milivolts, but not at 6V!

If anyone is interested in a really good fire detection method I recently evaluated a surprisingly cheap thermal Cctv Camera. Its model number is Dahua Kamera IP Dahua TPC-DF1241-D3F4 they come with different lenses, but this particular one (D3F4 on the end) is one of the cheapest(I paid $275...

Here is the layout that will be used. Cables will be tidied up and the BMS will be held to the top of the board by vhm tape. I'm not planning outside terminals, just two case holes with grommets for the cables. Positive will attach directly to the fuse. Negative will be connected to the BMS held...

I've recharged the battery slowly with a supplied charger (5A). Then after standing for few hours all cells were pretty close in voltage. I run another test and it's 93Ah :-( Kepworth will be going back too if I get a better one I'd really like to have these 7% more. However, I have to give it...

I'm replying to myself rather than editing to make sure people that have seen this don't miss this info as it is rather important. I've discovered almost every single cheap 12/24/48v battery available on Aliexpress in Europe currently is the same scam. It is called "ampere scam" and it...

Give it 2 years, once you know all it's quirks (the absolute worst is "I finished my part, let me just add a small hole in the first sketch I drew" and everything blows up) you'll be able to use it without (too much) frustration. Indeed. What was the outside temperature at the time and how...

All 5 are fine These are 585W bifacial Jinko. Very similar in size to a sheet of plywood or osb. Currently I'm moving them with my wife's help. Before I gor them I thought, maybe I'll test this or that location... No way. They are getting installed and they will stay there.

I'm very much interested in this. The main question is, are these using true modbus protocol? I have a DEYE SMK 3K and also a EASUN SMH-ii-7k, both came with identical "wifi dongles". I haven't powered up the EASUN yet as I haven't got a battery yet, but I'm pretty sure if both use the same...

Am I the only one that actually prefers 4500K~5000K lights? Anything under 4500K puts me to sleep in the evening. Sadly (for people like myself) the best and newest LED tech seems to be in the "warm glow" market. When I was building my house some 8 years ago I had a hell of a time looking for...

I'm not saying the device is capable of 120A(I saw the wiring). I meant I beged to differ it is a translation error, not that it is capable of running at 120A. At the end of the day I don't know. Perhaps it is both a translation error and they don't know their arse from their elbow when it...

With such a low current (30A) it didn't make a difference. These 8 cells sit now at 3.276V exact. A nice feature of using a hobby charger is tgat it tells me exactly how many AH went in, but charging like this is way too slow for me. So having made additional aluminium bus bars that let me...

Let's give a real world example... It is my friend's cabin. He just needs enough electricity to run a mini fridge-freezer(average 35W), charge a mobile phone and run a couple of led lights. His power requirements are fully met by a single 400W panel and a 100ah 12V battery. But the compressor...

The controller is what forms your micro grid. It also controls the generation of all sources by increasing/decreasing the frequency slightly to let them know what to do. No doubt others know more on this topic. The only setup I know of like that is one that involves a Victron Multiplus II as a...

That's what I thought until I bought some (admittedly very old) cells like these. Sadly I didn't know at a time these(blue CATL ones) have not been made in years, but for the time being I'm stuck with them so I tested a lot about them. I thought they can be used without compression, but the...

I'll definitely prevent this for the next use of the fixture. No it was higher, no doubt due to my previous un-equalisation effort. During the most of the string charge it fluctuated around 20~60mV as the BMS was actively balancing. The balance current was pegged at 2A/-2A and the high and low...

I come from the same background, but I use a Q8 charger. I'd recommend to charge your pack the same you would charge a 4S lipo with your charger. Make a set of balance leads and heavy gauge main leads. Set the charger to LifePo (hopefully it has this setting) and appropriate top voltage (no more...

Ok, I did get my money back for the cheapest battery on AliExpress's. The battery brand is Ekpaowe and the seller is EKPAOWE Global Brand Store. Also in the end the seller tried to pull the old "ship it to this alternative address" scam (then Ali doesn't see you using their shipping label and...

Hi, I did my DIY system and I'm EU based (Poland), but I went the opposite route than you :-) Instead of getting bigger panels I took a gamble on a bancrupcy sale of a German company called Solibro. They used to make 120W thin film panels in Europe until it was found these panels deteriorate...

I'm not an expert, but I sure do have an opinion :cool: IMO, this is electrochemistry with huge amounts of energy stored separated by very little material. There is always a possibility of material failure, or process failure at the plant. Separator weak spot, bad mixing of solids that happened...