I don't think they would be more expensive, just more finicky... And
matching your charge controller cycling/dwell, etc. is much more
important for Li than just wet or dry for what we have now. And just
getting a Solar charge controller for Li is problematic right now, not
even matching settings on a charge controller to some arbitrary type of
Li batteries that you may dig out of an electric vehicle without a full
set of specs or without being able to match the batteries to the array
you decide to define.
Charging the Li batteries I use in hobby stuff is not for the light
hearted. There are many rules, like not combining battery strings, in
the Li world that don't exist in the wet world. I can string two 12V
deep cycles together and slap a 24V charger on them and not have to
worry about blowing up the house. Not true for Li...
Maybe someone on the list has more experience with these than I do.
Li strings have to have circuitry to prevent over discharging and too
high a discharge rate. You folks are pretty inventive and could come
up with all that. Not sure I want to take that on. I would like a
nice solution with solar charge controller matched to it and all in DC..
On 10/29/16 3:42 PM, Bill Prince wrote:
I would argue that they may be different, and perhaps incrementally more
expensive than lead acid to charge manage. But not double. so perhaps a
27,000 watt-hour charge controller for lead acid is $2000 (pure
speculation). The charge controller for a 13,500 watt-hour LI charge
controller might be about the same price.
The power wall is probably impractical simply because of the voltage
that it runs at. Isn't it something like 500 volts? Not very usable from
our perspective unless you want to double convert (first to AC, then
back to DC). It would be much nicer to build a ~~ 56 volt system from
surplus LI batteries and move on.
bp
<part15sbs{at}gmail{dot}com>
On 10/29/2016 3:34 PM, Robert Andrews wrote:
But charging Li batteries is nothing like charging lead acid and you
need to have the right kind of charger for specific types of Li
batteries... That's the issue right now. Otherwise I would be buying
Li batteries like Pez...
On 10/29/2016 10:47 AM, Bill Prince wrote:
So it forwards the argument Chuck proposed; salvage battery packs from
electric cars. DC all the way.
bp
<part15sbs{at}gmail{dot}com>
On 10/29/2016 10:35 AM, Robert Andrews wrote:
About 1.5 time lead acid will do. It's something I am drooling over
for my remote sites... But the charging situation is the deal
breaker... double conversion in and out of AC... and you have to use
their solar If I remember right...
On 10/29/2016 08:44 AM, Chuck McCown wrote:
True. I wonder how many cycles it will do at that DOD.
*From:* Bill Prince
*Sent:* Saturday, October 29, 2016 9:42 AM
*To:* [email protected]
*Subject:* Re: [AFMUG] Tesla solar roof
But did you notice that it allows 100% discharge?
Doing the same thing with lead acid would require 27,000 watt hours.
Double the cost.
bp
<part15sbs{at}gmail{dot}com>
On 10/29/2016 8:34 AM, Chuck McCown wrote:
5000 watt of inverter is worth $1250.
(5500-1250)/13500=
�
31 cents per watt hour.�
�
You guys have posted battery costs of half that.�
�
*From:* Craig Schmaderer
*Sent:* Saturday, October 29, 2016 6:14 AM
*To:* [email protected]
*Subject:* Re: [AFMUG] Tesla solar roof
�
Chuck what do you think of the upgraded battery?� $5,500
�
�
Image
�
------------------------------------------------------------------------
*From:* Af mailto:[email protected] on behalf of Craig Schmaderer
mailto:[email protected]
*Sent:* Friday, October 28, 2016 8:04:11 PM
*To:* [email protected]
*Subject:* [AFMUG] Tesla solar roof
�
Looks sweet.� I hope it doesn't cost more than the house.�
Get Outlook for iOS <https://aka.ms/o0ukef>
�
