[RE-wrenches] LiFePO4; WAS Availability of Powerwall Batteries

markf at berkeleysolar.com markf at berkeleysolar.com
Mon Jan 25 12:28:28 PST 2016


Dan,

Can you give us a quick over view of the ins and outs of the NiFe batteries?

Thanks,

Mark Frye




> Marco;
> Winter storms, hurricanes, earthquakes, tornados, floods, etc. - backup
> power. Maybe load shaving as the utilities get more persnickety on time of
> use upcharges.
>
> Of course for most folks, an infernal combustion generator is far more
> cost
> effective than batteries. But for an extended grid outage and with a
> critical loads subpanel installed, PV charges on sunny days, generators
> still need fuel which may be in short supply or inaccessible.
> So, preppers. Most are surprised at how little autonomy time they get from
> a really expensive battery bank, but if it's TEOTWAWKI at least their
> solar
> "fuel" is free, minus the amortized cost of the battery bank. I get lots
> of
> phone calls from preppers who really need lithium prescribed by their
> psychologist far more than they need it in a backup battery bank......
>
>  Lithium batteries seem impressive on how long they can sit unused / float
> with no degradation, but I'd rather let all y'all be the guinea pigs on
> them for awhile. I'm doing my part by guinea pigging NiFe batteries off
> the
> grid. So far, so good, and darned glad I now know their ins and outs
> compared to lead acid. I would have been horribly embarrassed if I'd done
> my first NiFe battery bank for a customer instead of for myself....I chose
> NiFe here simply because of decades of historical data, I don't trust
> Lithium yet for longevity, but thanks Larry C and others on this list who
> have been doing lithium batteries for years and reporting their results
> here.
>
> This Wrenches List is the gold standard of good information!
>
>
> Dan Fink
> Adjunct Professor, Ecotech Institute
> IREC Certified Instructorâ„¢ for:
> ~ PV Installation Professional
> ~ Small Wind Installer
> Executive Director, Buckville Energy
> NABCEP Accredited Continuing Education Providersâ„¢
> 970.672.4342
>
>
>
> On Sat, Jan 23, 2016 at 1:28 PM, Marco Mangelsdorf <marco at pvthawaii.com>
> wrote:
>
>> Aloha Larry,
>>
>>
>>
>> To take a step back…what’s the compelling value proposition from the
>> homeowner’s perspective to incur this non-trivial additional expense?
>> To
>> be blunt, what’s in it for them?  Back-up power?  First adopter mojo?
>>
>>
>>
>> Thanks,
>>
>> marco
>>
>>
>>
>>
>>
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