AndyZ
Posts: 7
Joined: Mon Sep 05, 2016 10:42 am

Battery's second life

Mon Dec 02, 2019 1:25 pm

Hi all.
I replaced my original 60Ah pack which has been drained till 16.5kW after 90000km range to new to 94Ah.
Actually, really thinking about using old one for home storage system.
Has anybody hammered what hybrid inverter to take to be ensure it will be suitable for such 400vdc battery pack?
Thanks.

jadnashuanh
Posts: 4943
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: Battery's second life

Mon Dec 02, 2019 1:59 pm

BMW had shown a prototype of that about a year ago. RIght now, they're tentatively planning on using those removed for warranty purposes for large scale commercial applications. You might contact them to see if they could help.
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV

Fisher99
Posts: 279
Joined: Sun May 12, 2019 6:24 pm

Re: Battery's second life

Mon Dec 02, 2019 4:06 pm

I'd be very interested to hear about your battery conversion. Did you do it yourself? New or used battery? Cost? Difficulty? Anything required other than the battery (controller, charger, etc)?

AndyZ
Posts: 7
Joined: Mon Sep 05, 2016 10:42 am

Re: Battery's second life

Tue Dec 03, 2019 1:49 am

A donor had 900 miles only so the battery is almost new.
Regarding the conversion. It is simple, my friend and takes just two hours))
The battery is fully autonomous standalone unit.
That's why i thinking to use it with solar hybrid inverter for home storage. And almost sure, there shouldn't be any surprise.

The difficulties will be if you want customize or change any device inside!! When you have whole battery, replace and enjoy. But never allow BMW in service to chip your donor battery SME. Their tooling will block the SME as it has wrong VIN doesn't match with your car.

Even, my i3 from SanDiego and don't have seat heating package. So, the 60ah battery without heater too. New 94ah battery has 1kw heating wire inside and works normally...

Joff
Posts: 53
Joined: Wed Jan 02, 2019 2:44 am

Re: Battery's second life

Tue Dec 03, 2019 8:53 am

Andy, are you saying you just removed the 60ah pack and installed the 94ah pack in 2 hours, and it worked?! Not even error codes? That would be big exciting news! As for your question, there are lots of inverters for 48v but much less choice and higher price for 360v. I'd consider opening the pack and put the 8, 48v modules in parallel.

AndyZ
Posts: 7
Joined: Mon Sep 05, 2016 10:42 am

Re: Battery's second life

Tue Dec 03, 2019 9:39 am

You've lost my idea. To connect in parralel brings huge terrible with what bms to use for!!
As i said, the whole battery pack is standalone unit... It's BMS should work normally at home same as in car...
That's why i'm looking for the inverter can support 400vdc battery.
Found Fronius but it's maximum output 16A only.

Regarding errors, there wasn't any.

First of all, we have tried to install my SME and check what happen with higher capacity.
Happened nothing. New battery has been used and charged as my old one, 16.5kw.
Stopped tests and replaced back.

Already driven almost 10000km, everything is ok.

P.S. teach me how to attach the photos here))

AndyZ
Posts: 7
Joined: Mon Sep 05, 2016 10:42 am

Re: Battery's second life

Tue Dec 03, 2019 9:47 am

Aah, forgot.
2014 and 2016 i3 have different battery's cooling inlet fitting and cooling valve wire connector.
That is only one thing has been replaced from old battery, Fitting holes are compatible!!

Fisher99
Posts: 279
Joined: Sun May 12, 2019 6:24 pm

Re: Battery's second life

Tue Dec 03, 2019 9:56 am

I wonder if you could use something like BimmerCode to register the new HV battery pack? In the same way that you register a new 12v auxiliary battery.

AndyZ
Posts: 7
Joined: Mon Sep 05, 2016 10:42 am

Re: Battery's second life

Tue Dec 03, 2019 12:22 pm

Nope, that didn't work.

alohart
Posts: 2041
Joined: Sat Nov 01, 2014 7:36 pm
Location: Honolulu, HI

Re: Battery's second life

Tue Dec 03, 2019 12:25 pm

AndyZ wrote:
Tue Dec 03, 2019 1:49 am
A donor had 900 miles only so the battery is almost new.
Regarding the conversion. It is simple, my friend and takes just two hours))
I have read that an i3's battery pack contains a safety device that immediately disconnects the battery pack during a collision to prevent deadly electrical shock danger, and that this device must be replaced before the battery pack can be used again which requires opening the pack housing. Was the donor i3 not involved in an accident?
Aloha,
Art

2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging, JuiceBox EVSE

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