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I have built a few 24V nominal 7s batteries myself and I am also using the generic Chinese BMS with the Bluetooth dongle in all of them. I must admit I'm quite pleased with them, so I'm sticking for the time being, since all the batteries I build are smallish at 2-3kWh, which I then parallel at...

Hello, Is there anyone here that manages the DIY Powerwalls Facebook group? Seems like I’ve been banned (!!!) because I suggested to a person that he should better not build a powerwall, because he was missing critical knowledge, yet was a member of the group for 3 years! Was it THAT rude of me?

Cheers to the forum. I am trying to replace the stand-by battery that is beingused in my home building elevator system for emergency lighting and lift release functions. The original battery is a sealed lead-acid 1Ah battery. The system charges the battery under 100mA and it keeps the battery...

This project took some time, since I'm mostly crazy-meticulous about anything I do and this has also bubbled over into my hobbies. I started gathering laptop batteries around a year ago and havegone through just around 120 of them so far. It's somewhat difficult to find used batteries in Greece...

20cells, total 27.4Ah, mean capacity 1370mAh. Decidedto give away my lowest capacity cells, which I will not be using anytime soon. Here's the link to the bay auction. Weld tabs have been carefully removed. Cells have been thoroughly tested and cleaned. A couple may need new shrink...

I am thinking of putting together a few solar lights for a couple of sheds I have around. Thinking 3s with a BMS and connecting to 12V led strips through PIR sensors or timers. Anyone done anything similar? Thinking of something like this:

Got some of these out of a Chinese-madereplacement battery: Capacity out of battery cover calculates to 2400mAh. Still untested, no heaters though. Do we have them in the cell database?

Now, that was a new one for me... I thought they always try to utilize space to the fullest: :D

I have been building Power Banks using the lowest-quality cells I scavenge that are still above 1000mAh at a discharge rate of 0.5A. These cells obviously will not end up being used on a Powerwall project, they did however pass all testing.I will share my thoughts on the projects and my...

I am currently using an MPT-7210A MPPT solar charge controller / boost converter to charge my 36V 2s10pe-bike battery from a Lead acid 12V battery, which I keep under float voltage through the grid, since my solar setup is a bit off right now. I have set the Vmp (input) on the MPT unit at 11V to...

I have almost completed my solar-powered 6p10s36V nominalmini powerwall from liberated cells, which I will be adding to the Cell Counter soon and will keep adding more cells as I scavenge.I am using an MPT-7210A for charging it from a 27V Vp 360W solar panel. The battery pack is around 18Ah...

Hello, Would it be possible to build an off-grid system with no batteries at all? Just panels and inverter for 220v when the sun is shining.

Hello, I am thinking of installing a mainsenergy monitoring system and have been looking into OWL Intuition as well as Efergy Engage platforms. Are there any other platforms that offer an out-of-the-box solution for my 3 phase installation? I am surprised I did not find something...

Hello, I have a 8.4V 7xNI-MH handheld vacuum cleaner that's been working wonderfully, until I have to install new batteries. This is the 2nd time the batteries will be swapped, they last for about two years. I was thinking about swapping the 7xNI-MH with 2p2s lithium batteries and I have a...