There are so many really good Li Iron Phosphate Batteries available,
that are actually designed for off grid, that I don't see any advantage
to using a more unstable chemistry that is not designed for off grid.
AC coupled is a 2nd huge no no for off grid, and can leave an unattended
system completely inoperable. Anytime the main battery inverter shuts
off for any of several reasons: overload, overtemp, low battery, etc.,
it also means that all charging of the system ceases as well.
For Off grid, reliability is absolutely #1, and owner safety is directly
related to that reliability. They can lose water, heat, refrigeration,
and communications in an outage. I'm just tired of folks dabbling in
off grid, and not taking it seriously. Why in the world would someone
even consider using a product that its own manufacturer says should not
be used off grid?
Ray Walters
Remote Solar
303 505-8760
On 7/19/20 10:54 AM, Jerry Shafer wrote:
Hilton, Wrenches
As I recall Tesla does not recommend their battery for off grid
applications, they need to be connected to the internet and without
that there may be warranty issues. I don't think that the off grid
world and daily cycling would work well over time either. How would
you jump start the power wall if it died do to low voltage cut out, a
genny might work if it connects and stays connected this might also
affect the warranty.
Jerry
NABCEP PV inspector
On Sun, Jul 19, 2020 at 9:02 AM Hilton Dier III <hiltond...@gmail.com
<mailto:hiltond...@gmail.com>> wrote:
Greetings, Wrenches,
I have an off-grid client who has been reading the buzz about the
Tesla Powerwall 2.0. I have been reading the data sheets and
manual for it and it appears to be AC coupled only. There was talk
of a DC input version, but apparently that fell by the wayside. I
try to be agnostic about technology, and I'd be willing to
subcontract a Tesla-approved installer if, in fact, this was the
best solution.
Does anybody have experience using the Powerwall 2.0 in an off
grid PV system? Is it AC coupled only? Can it take generator power
without barfing? What is the lead time on these?
Many Thanks,
Hilton
--
Hilton Dier III
Missisquoi River Hydro
Renewable Energy Design
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