Powerwall project with 18650 battery

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Micka76550

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Jan 1, 2018
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Bonjour tous, je suis nouveau, je vis en France Haute Normandie rgion, et je prvois de faire une powerwall avec 18650decouvrir les piles, pour le moment j'ai environ 1600 (2000mah 2700mah) :)

Cette semaine, je vais Pour obtenir une comte UPS Ups MGE ex 7 rt ap paremment la batterie est de 240v (12v X 20 batteries) pour remplacer le li-ion, je voudrais savoir si quelqu'un a dj fait une modification? Merci d'avance.

Hello everyone, I'm new, I live in France Haute Normandie region, and I'm planning to make a powerwall with 18650decover batteries, for the moment I have about 1600 (2000mah to 2700mah) :)

This week I'm going to get a UPS Ups MGE comet ex 7 rt ap paremment the battery is 240v (12v X 20 batteries) to replace the li-ion, I would like to know if someone has already made a modification? Thank you in advance.
 
Welcome to the forum.

1) Yes, there are several users who have done UPS mods. If you do a search for UPS you will get a lot of hits on the topic. AverageJoe runs his equipment off his Server grade APC UPS.
2) French is fine, as long as you do what you did above ;) Otherwise so everyone can participate, please use english.

And also take a look at the FAQ as it has loads of information about general topics of the LiIon cells and types of equipment/chargers/etc
 
OK thank you, I go directly in English :) , for cons inverter ups I have not found a similar model to mine, they are often under 48v, while mine is under 240v (li-ion 66s) :-/
 
Micka76550 said:
OK thank you, I go directly in English :) , for cons inverter ups I have not found a similar model to mine, they are often under 48v, while mine is under 240v (li-ion 66s) :-/
Click to expand...

Keeping a 66s setup balanced may be difficult. And possibly prohibitively expensive
 
That was my thought first on the bms, but then how does tesla do it to their batteries? They run 96s I believe. Using Batrium with 96 longmons would cost around $1600! for 66s it would cost $1200.

Then I thought what about it's idle power, it's got to be one of those massive datacenter UPS that probably draws at some godly amount for doing nothing. Maybe it's not a good fit for a small powerwall, but maybe for something massive.
 
You could do the bleeding portion manually. Well, sorta. Instead of using something like the longmons to do the bleeding, you could use the Batrium to trigger events. I'm not entirely sure how it gets its voltage readings for each pack. Maybe that's part of the job of the longmons.
But what I'm thinking is have a heavy duty relay for each pack. Each relay is connected to a resistive load. Use an arduino or some other mcu to do the monitoring (maybe Batrium can do this, I don't know) and then when a pack starts to get higher than the other packs, triggers the relay to that pack and starts a dump. This doesn't have to be heat lost to the air, you could use it to heat water, perhaps.

That's just what pops into my head atm. I should probably head to bed as it's almost midnight here :p
 
not2bme said:
That was my thought first on the bms, but then how does tesla do it to their batteries? They run 96s I believe. Using Batrium with 96 longmons would cost around $1600! for 66s it would cost $1200.

Then I thought what about it's idle power, it's got to be one of those massive datacenter UPS that probably draws at some godly amount for doing nothing. Maybe it's not a good fit for a small powerwall, but maybe for something massive.
Click to expand...

Depends also if OP wants to use new or used cells. I cannot imagine the logistics of trying to capacity match 66 packs. I don't think that would be achievable with used cells.
 
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