Are these lead acid batteries suitable to build a powerwall with?

Multiboxer

New Member
Hello everyone,

I wondered if I could use the following batteries to build a power wall with and hook them up to a fitting MPPT charger+inverter and solar panel setup. (Victron Easysolar)


Type : 6EP1935-6MF01 (datasheet attached)
Amount : 600+
Age : 3 years max
Voltage : 24V packs
Cap : 12Ah / 0.28kW/h
Always stored between 15-25°C
Always connected to a charger/UPS system
Been partially discharged maybe 4 times.
The battery impedance/voltages would be checked beforehand to weed out any bad ones and make sure they have the same voltages.
I would start the setup with 64 of these and hook them all up in parallel to the MPPT.
That would give me 18,4kW/h of power which I can of course only partially discharge.

What do you think of this setup with (quite a few) smaller batteries?
I can even expand the battery setup as I have plenty more available over the next years.
The fact that I can get them for free makes it very tempting to give it a try.

I would use the battery packs as whole to connect it to the 24V of the MPPT charger and also because it's very easy to mount them on the wall.
Each pack also had a 20A fuse, holder and wire clamps.

Below 1 column installed, will install a minimum of 7 more.

Below the battery type.

My apologies for my English, it's not my first language.
Thanks in advance for the advice!
 

Attachments

  • 6EP19356MF01_datasheet_en.pdf
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DJSmiley

Solar Addict
Well… it can, but i won’t recommend it.

Service life is only 4 years, they now are at 3 years.
Will probably work for 1-2 more years, if you keep the room around 20 celcius. If it gets hotter, service life for lead acid will drop significantly.

With lead acid you have 50% capacity: you can’t pull fully discharge them. Below 50% irreversible damage will occur.

With the amount of work involved for only 8kwh… with a short lifespan…
And dont underestimate the costs of wiring and conbectors for such amount of batteries

And i’m not taking the weight into account. It will even overload many floors since they aren’t designed to carry such weights.

Better get some $$ at a scapyard. Assuming 2kg each, 600 pcs is over 1200kg.
Here in NL i can get approx 0,45 euro/kg so it would give me 500 euro or so.

If you buy bulk lfp cells, yes, it will be more expensive, but if you substract the money from the old leadacid cells its going to be <$2000 for 10kwh lfp or even more, with a lifespan of at least 10 times the lead acid.
(And with all other benefits, especially size, weight and amount of work involved)


Ow and if you can, go for 48v with these amounts of capacity. Much easier to run high loads.
 

chrisski

Photon Sorcerer
12 ah is not a lot of power at 12 volts. A lot of my LED lights are 1 amp, and one of these batteries would not have enough energy to run a single LED overnight.

If a power audit says these will power what you need, you can start with this, maybe with the intention of going to something else.

Edit: If you want to post 64 of these in parallel, then there is a document in my signature block about hooking up batteries in parallel. Not done right, most of those batteries would not contribute very much to a load, so you'd get a lot less than 18 kwh of power.
 

Multiboxer

New Member
Edit: If you want to post 64 of these in parallel, then there is a document in my signature block about hooking up batteries in parallel. Not done right, most of those batteries would not contribute very much to a load, so you'd get a lot less than 18 kwh of power.
Hey Chrisski, Thankyou for your comments on this project. I'll first read up on the document you mentioned and get back to you. :)
 
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