Electric Vehicle batteries

[ferrofan]

I was just wondering if anyone had given any thought to using secondhand EV batteries as a source of house batteries? (along the lines of a Tesla powerwall)
There seem to be a growing number becoming available from low milage EV's that have been written off by insurance companies after RTAs.
I'll be honest I haven't looked in too much detail, but from my limited knowledge I believe that they are constructed from a large number of small cells wired in series to deliver 60volts to a block and then a number of blocks are wired in series to produce around 300V output. I should have thought it would be reasonably straight forward to re wire the cells in to 12v blocks? Reason I ask is that for the same AH second hand EV batteries seem a lot cheaper than new lithium batteries.

[tanglewood]

I'm sure people have done it. For me, the key question is whether the cells are LFP vs something else. I'm not up to speed on what cars use what, but I know many are not LFP. I think LFP is the only formula suitable for use on a boat because of safety and fire resilience.

[mbartosch]

Have a look at this existing thread: Tesla House Battery
http://www.cruisersforum.com/forums/...d.php?t=195778

[john61ct]

I don't know any mainstream production vehicles using LFP, their lower energy density is an issue.

The LI chemistries they do use are much more risky (boom bad on a boat), and are protected in the vehicle by sophisticated thermal protection systems that would be a real challenge for most of us to replicate.

IMO LFP is the only non-lead chemistry that a DIYer should consider for use within a small enclosed living space.

LTO is worth some bleeding edge experimenting, but only on land out in the back shed to start with.

http://www.cruisersforum.com/forums/....php?p=2765223

[Go Wildcats]

Sailing the Space Between couple have used Chevy Volt presently and I think Fiat batteries in the past - they're posters here, but can't recall the username.

https://www.youtube.com/watch?v=Fu9zFFv6IC0

https://www.youtube.com/watch?v=9GoSDOM-jVI

[GordMay]

Want an electric vehicle? Here's why it can be so hard to get one
➥ https://www.cbc.ca/news/technology/e...mand-1.5394140

[chubby]

i've looked at the tesla batteries...


..but that huge kw/$$ advantage folks taut on youtube didnt seem to actually to be there for me.
...at least compared to to DIY ebay/alibabaexpresss sourced lifepo4 setups. (which seem to also be relatively more idiot proof)


the bmw i8 batteries were (way) underpowered for the price, imo.


maybe as these EVs are becoming mass produced and more ubiquitous on the road the battery packs (and engines) will be be much more readily available (and cheaper)

[tkeithlu]

What is the problem you are trying to solve, ferrofan? It looks like big cost and big risk. Do you need the weight reduction or the ability to quickly recharge many times badly enough to even look down that road? Are you looking for creative modification ideas for your boat, something I'm forever doing?

[GordMay]

NHTSA to investigate LG Energy Solution battery failures

The NHTSA has launched an investigation into LG Energy Solution batteries, after a series of electric vehicles, using the cells, have shown “internal failures.”

Opened on April 1, the NHTSA lists a series of electric vehicles utilizing LGES cells, that have been assigned to recalls.

Internal Failures in High voltage batteries produced by LG Electronics
NHTSA ➥ https://cdn.motor1.com/pdf-files/inoa-eq22001-7596.PDF

More reporting about ➥ https://www.teslarati.com/nhtsa-to-i...8000-vehicles/

[OldManMirage]

Beau and Brandy Sailing did it with Chevy Volt batteries. They are still using them some years later, not sure exactly how long.

https://www.youtube.com/watch?v=yVKFW2uz8_U

[Franziska]

Just make sure it's LiFePo4 and not ordinary LiPo.
LiFePo4 is much much less of a fire hazard. On a boat that is much more important than on a car..

[Rumrace]

I have a Tesla approaching 5 years old. It’s boring nothing breaks

https://9gag.com/gag/an579Kn

New Mercedes

[Rumrace]

I got to say the Chevy Volt is just about the most lame car pretending to be electric. It’s pushing full on gutless at 20% charge. Range at best in real world driving 40 miles new. Honda Toyota Ford Tesla Audi serious stuff.
The Rand Picnic an all electric boat has a 300k range on a charge. Even has room to upgrade the battery package.
Keep in mind lithium and water are FUBAR and lipo marine batteries are designed not to blow your boat up submerged

[GordMay]

Originally Posted by Rumrace

... The Rand Picnic an all electric boat has a 300k range on a charge. Even has room to upgrade the battery package ...

With a Torqeedo Cruise 4.0 engine and a 6.2kw battery, you should get a maximum speed of 10kph and 2 hours running time [20 km range], or 8 hours at a sedate 6kph [48 km range].

The Rand Picnic 18 [Electric] comes with:
Torqeedo Cruise 4.0 RL incl. 7 kWh Lithium Battery, or Torqeedo Cruise 10.0 RL incl. 10 kWh Lithium Battery Outboards, or the Torqeedo Cruise 4.0 FP incl. 7 kWh Lithium Battery Inboard.

[Rumrace]

When you are fact checking with cut n paste obsession to imply a higher understanding, or that I’m lying or embellishing could you please cut and paste the whole article. Like Rands brochure which repeat my statement.
Otherwise you comment does nothing but imply I’m misleading the conversation.