Re: [EVDL] Battery packs and UPS options?

2024-01-20 Thread (-Phil-) via EV 
FYI, I forgot to mention, you can drop the Tesla drive unit and replace the
bearings in there to get rid of the milling noise.   I have done it.

Sadly it doesn't last forever because of a flaw in the design that was
fixed in later revisions, but I've seen them do 60k miles.

The Rav4EV is still a better car than a powerwall.

On Sat, Jan 20, 2024 at 4:02 AM fred via EV  wrote:

> As much as I like to do DIY stuff, -Phil-'s suggestion is wise. It would
> have grated to have to hire muscle making it less DIY after all. The
> insurance aspect escaped my alleged mind and certainly is an important
> aspect. It's not like I have a hunting cabin in the woods, which still
> would not justify the risk and difficulty.
> This idea becomes immediately abandoned.Thanks very much for the input. I
> like also things that result in less work for me!
>
> **Original Message: 6
> From: "(-Phil-)" 
> To: Electric Vehicle Discussion List 
>
> As much as I like to see DIY stuff, I'd recommend you just sell your Rav4EV
> and use that to add some powerwalls.  Not only is it a lot of work to make
> something like this, it's also difficult to make it safe, and if something
> bad happens and you have a house fire, you don't want the insurance company
> denying your claim because you hooked a non-approved home-brew device to
> your home's electrical system w/o permits, etc.
>
> The main problem is there are no good off-the-shelf solutions for inverters
> with a proper control system.  In addition, unless you fully
> reverse-engineer the Tesla BMS in there, you'll have to roll-your-own, and
> it's hard to do that safely, let alone easily and/or affordably.
>
> End of Original Message: 6
>
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Re: [EVDL] Battery packs and UPS options?

2024-01-20 Thread fred via EV 
As much as I like to do DIY stuff, -Phil-'s suggestion is wise. It would have 
grated to have to hire muscle making it less DIY after all. The insurance 
aspect escaped my alleged mind and certainly is an important aspect. It's not 
like I have a hunting cabin in the woods, which still would not justify the 
risk and difficulty.
This idea becomes immediately abandoned.Thanks very much for the input. I like 
also things that result in less work for me!

**Original Message: 6
From: "(-Phil-)" 
To: Electric Vehicle Discussion List 

As much as I like to see DIY stuff, I'd recommend you just sell your Rav4EV
and use that to add some powerwalls.  Not only is it a lot of work to make
something like this, it's also difficult to make it safe, and if something
bad happens and you have a house fire, you don't want the insurance company
denying your claim because you hooked a non-approved home-brew device to
your home's electrical system w/o permits, etc.

The main problem is there are no good off-the-shelf solutions for inverters
with a proper control system.  In addition, unless you fully
reverse-engineer the Tesla BMS in there, you'll have to roll-your-own, and
it's hard to do that safely, let alone easily and/or affordably.

End of Original Message: 6
  
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Re: [EVDL] Battery packs and UPS options?

2024-01-19 Thread Willie via EV 


On 1/19/24 16:46, fr

What options exist to provide the equivalent of a Tesla PowerWall from the 
removed pack of this Rav4EV?
Rather than fill up this vehicle oriented forum, perhaps a viewer can redirect 
me to a suitable forum? Also, I feel it's important to note that we have a 
PowerWall and 9Kw of solar PV and it would be great to make this all work 
together. I have real estate on the south wall adjacent to the PowerWall, no 
windows, power meter and primary cut-off all in the same location

The below from me, not Fred.  I plead editor impairment.
I've had good luck augmenting my PW with ~250w micro inverters powered 
from 36 v batteries.  Those 36v batteries coming from battery banks 
made up of ebike/hoverboard batteries and golf carts.  All LFP or the 
ebike chemistry.  I had a single battery PW which I eventually 
upgraded to three batteries and thus no longer attempt augmentation.  
I've fiddled trying to do similar with 12v out of both imievs and 
Teslas but was unable to get good ~36v out of 12v with cheap DC-DCs.  
I do recomnend 36v into microinverters.


I have a couple of leftovers that I no longer have use for:

1) I bought three PW batteries to add to my single battery system but 
apparently killed one.  Likely by crossing L1 and L2.  I wish to find a 
home for the non functioning PW battery. Or find a repair path.


2) Long ago, I bought an EVTV off grid unit,  6kw/15kwh battery/inverter 
I think, intending to make another of my electric meters/transformers 
more immune to grid outages.  I've lost interest in that project so 
would like to find it a home.


I agree with Phil that PW upgrade is almost certainly the easiest and 
cheapest path.




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Re: [EVDL] Battery packs and UPS options?

2024-01-19 Thread (-Phil-) via EV 
As much as I like to see DIY stuff, I'd recommend you just sell your Rav4EV
and use that to add some powerwalls.   Not only is it a lot of work to make
something like this, it's also difficult to make it safe, and if something
bad happens and you have a house fire, you don't want the insurance company
denying your claim because you hooked a non-approved home-brew device to
your home's electrical system w/o permits, etc.

The main problem is there are no good off-the-shelf solutions for inverters
with a proper control system.  In addition, unless you fully
reverse-engineer the Tesla BMS in there, you'll have to roll-your-own, and
it's hard to do that safely, let alone easily and/or affordably.

On Fri, Jan 19, 2024 at 2:47 PM fred via EV  wrote:

>  Within six months (my wife's retirement), we will no longer need one of
> the two EVs in our fleet of Rav4EVs (contemporary, not legacy). I feel the
> resale value is low, due to a turbine song from the power plant, confirmed
> by coolant speckles on the speed sensor. If it survives to the date, we'll
> need only one vehicle. If not, I'll be pressed into chauffeur duty for the
> interim with my not-yet-checked Rav4EV.
> With such a low value for the humming Rav4EV, I'm considering repurposing
> the vehicle as a UPS but it must be an off-street-legal integration, as
> opposed to a street-legal one which I think only applies to V2G vehicles
> currently in production.
> What options exist to provide the equivalent of a Tesla PowerWall from the
> removed pack of this Rav4EV? Rather than fill up this vehicle oriented
> forum, perhaps a viewer can redirect me to a suitable forum? Also, I feel
> it's important to note that we have a PowerWall and 9Kw of solar PV and it
> would be great to make this all work together. I have real estate on the
> south wall adjacent to the PowerWall, no windows, power meter and primary
> cut-off all in the same location.
> Due to limited physical capabilities, I'll probably have to pay for
> muscle, but parting out the shell may provide for funding. This will be
> July 2024 or later, temperatures in Florida will be inversely uncomfortable
> compared to today in most of the USA.
>
>
>
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