Computer inverter to make an emergency home lighting

[phil59]

As I said, I missed these batteries in 2017-2018, when changing the batteries of the inverters at work....

If I had known, easy with ifs, 54 9-year-old batteries, at 65Ah, it wasn't bad, because I knew they had cycled very little, just age, so still at least 50% capacity. ...

I missed batteries at the end of July, at 15-20€ each, but around 25-30 Ah....

Maybe another possibility at the end of the month, batteries changed as a precaution, but 400 km from home. But it's starting to do a lot of km, if you don't have to pass in the area.....

[sicetaitsimple]

Alright, you missed some opportunities!
But my question was "And the one you photographed, couldn't she go for the tests?"


It would still be silly to buy batteries before having validated the operation of the diagram with a 48V assembly, even if it is composed of 4 totally heterogeneous 12V batteries.

[phil59]

The photos are from the job, not the one I have.

But I'll find, I'm patient, and I'll find cheap.

[phil59]

So, I had one of 120 NiMh cells, put in 2 times 40S, and 4 times in 10S. It was these 13 mAh cells, in 000V therefore. Now remains safe 1.2 A.

I don't have a bms for that, and I wonder how to drive that, "pseudo intelligently" so as not to load and unload too much ....

So I have this inverter in 48V, and I also have another one in 96V, which I'm not sure at all.....

I said to myself, that as I realized that I had a pair in 2,5 mm2 which was available in a shed, to return practically to the arrival of the cellar, I was going to store the batteries there, not too close of the house, and could almost redistribute all the lighting in the house.

[phil59]

Does anyone know where to find either a BMS for these batteries?

Or do I need to build something based on Arduino?

On 18650, lifepoe is very easy to find, but not there...

The goal is that it lasts over time, not to shoot everything in a few months.....

[Christophe]

You won't find any because NiMh doesn't need to be balanced like lithium cells...and who still uses NiMh? It's just recovery...

The NiMh voltages are at 1.2 V if you really want to put a BMS you will have to put 3 in series to simulate a 3.6 V lithium element...

Good luck with the assembly and wiring!

[phil59]

That's what I thought I read, while looking for how to connect them.

These cells were used for some time on an electric kangoo, in addition to replacing the batteries of the time (2000), and now the guy has tossed everything out and put 18650 cells instead.

The guy did this more for fun, a technical challenge, than for his real needs, and now has 105 kWh of battery on his old kangoo from the 2000s (I remind you that 40-50 kWh of battery is already very large).
He's a character the way I like them, although unfortunately I couldn't be "face to face" long enough.

Respect for his work, and I would like to be able to do this as well as he does.

So, I think at first, I'll put a little like this....

As I said, 2 blocks of 40 cells at 48V, and 4 blocks of 10 cells at 12 V.

And I will also start making 18650 assemblies, with BMS, to make 12V. As everything will be more or less outside, I found an old "cube" of a dishwasher, so metal, to house the batteries, it should limit the spread of flame in case, but not the heat , or I surround with glass wool, but still have to evacuate heat ....

On the other hand, the panels in the garden are good for orientation as you want, and for maintenance.
But the first 3 are on the ground, and that poses some problems....

The other 2 are 10-20 cm from the ground, it's better, but I think the next ones will be 40 cm ....

[Christophe]

105 kWh in his Kangoo is more than the best Tesla!!

How many 18650s does it take to assemble? In the 10? I see that there are fools more affected than me!

How much did it cost him?

Does she pass the CT for her completely tampered with electric kangoo?

[phil59]

So for the CT, he removes a part as a precaution, the one under the "engine" hood where the heat generator was, because some kangoo had the option of a heat generator.

But it still has, it seems to me, more than about 80 kWh of battery.

The CG is the original electric car, so no worries there, it's the same electric motor, and it therefore remained at the same power, but with a very slight excess weight (very light).

More than a Tesla yes, but much less designed, and it "eats" more at 100, and I think you don't exceed 110 km/h, or something like that, like aerodynamics less well done, and it doesn't did not decide on it to modify as certain!

Remundo and Macro know, I believe, from another forum, under the nickname of CHEVREUSE.

As I said, I didn't have enough time for the chat, when I should have taken it, because on the way back, I had a 2 hour traffic jam in Paris...

He also added on-board chargers.

He told me the exact number of 18650, but I forgot, and I believe it was over 10....
He used the car's existing battery tray.

And if you also search on the internet, planetary, who removed his battery from his prius II, to put a much larger battery inside, in order to have a little more than 100 km of autonomy in full electric, with its initially non-rechargeable hybrid.

I also admire this type of work, it's impressive.

with modern EVs, it's much more complicated to do, all this ....

I forgot, CHEVREUSE did not start out in electronics, he was more of an engineer in materials.

Afterwards, I admit, that even for very long journeys, the 64 kWh of the kona, are much more than enough, but we could imagine a powerwall for the house, which we could come and re-graft on our VE, when we going on vacation ... But that's another debate, weight, space, etc ....

[phil59]

So the inverter that I bought for 20-30€, for normally 2 kVA, works with batteries.

I put the 2 40s batteries in //, one of them is a little weaker, and I plugged in an electric heater, almost pure resistance, in 750W, and then I put 1250, it seems to me , and 1700 .... 1250W it just passes, and 1700 it almost cuts off, the time to go back to 750W, and it lasted a good 2 minutes ....

Will have to cycle the batteries several times I think, to "encourage" them.

What I don't really understand is that the "meter", more than 20 years old, does not exceed around 550W ....