Thanks for the reply.
coleafrado wrote: ↑
Wed Feb 05, 2020 11:20 am
The battery shouldn't really be worth more than the entire car unless the body is completely trashed. An 11 kWh pack should be worth about $1100, the rest of the car between $2-3k. If you just want to buy some batteries for a home, 200 Ah LiFePO4 cells can be bought from Alibaba for barely $100/kWh. There's also a flourishing market on eBay for Leaf cells - maybe you could buy a 40 kWh pack from a wreck, part out your pack for $1500-2000 on eBay, and end up with a working 150-mile car for ~$2-4k.
Actually, in my area, I don't see the resale values that you state. For instance, there's a Leaf that's a year newer, has lower mileage, and has the same ~36mi range that's been on the market for a month for $3400 with no takers. I haven't been able to find cheap battery packs in good condition.. if you have good sources, please let me know.
Battery upgrades aren't that complicated - it's just a matter of finding a wrecked 40 kWh pack, locating a shop that has a lift and knows how to rework a couple parts of the wiring harness, and convincing mux or Dala to send you their adapter kits. Someone reportedly even got Nissan to program their car to accept a 2018 pack.
I have an MSEE, have been working on cars my whole life, and besides being co-designer of OpenEVSE, I also designed the LeafCAN SOC meter viewtopic.php?f=44&t=8673&p=193095&hili ... an#p193095
, so I'm up to the challenge of doing the work myself. But I spent hours reading muxsan's thread, and went to his website, and can't see that he's actually selling his CAN MIM board, or specifics on how to configure it. While it would be fun to spend time learning how to hack it myself, I'm simply don't have that much time to devote to this project, especially when (1) the battery is still going to overheat and wear out before its time, just like my original one, since it doesn't have cooling, and (2) it's still going to have subpar range. It's worth it to me only if it can be done for ~$2500, and doesn't require zillions of hours to do. So you're saying that muxsan solved all the problems, and we can now transplant any arbitrary model year's battery pack into a 2011? If so, I guess I need to try to get more info from muxsan backchannel, and possibly convince him to sell me one.
The issue with using the battery directly as a powerwall has been discussed all over; the issue is that it's not worth it. It doesn't make sense to use a solar inverter and a J1772 charger, and have to deal with the pack constantly balancing, when the cells could be taken out and reconfigured to a 24V or 48V system. J1772 is a standard for vehicles with onboard chargers to draw AC power - and the Leaf OBC is extremely difficult to get working when it's not hooked up in the car.
The whole benefit of a Powerwall (from Tesla or others) is that it automatically protects your house from outages and charges itself whenever electricity is cheapest. The Leaf battery by itself does nothing of the sort, so retrofitting that functionality is likely to exceed the price of a pre-manufactured Powerwall.
Actually, I don't necessarily need automatic failover, although that would be nice. I might just use it to power only a small isolated part of my house that could be on a dedicated circuit, and when the grid goes down. And cost wise, there's a huge difference. The Powerwall costs about $7800 installed, and is 14kWh. My Leaf pack has more than 11kWh of capacity left in it. If I took it apart and reconfigured it for 48V, I could pair it to an Outback GS4048 for <$2K. Throw in another $1K or so for other stuff like contactors, BMS, etc, depending on how much stuff I build myself and/or buy recycled. Then, I was hoping I could sell off the rest of the car for ~1-1.5K.
I came up w/ the using the Leaf pack intact idea because I liked the idea of using its existing BMS, labor saving of not having to take it apart, safety, because it's already packaged up in a well designed metal box, and because it looks like no one's gone that route yet.
I appreciate your input & info