Re: Wind Solar unreliable compared to Gas Coal Nuclear

Jim Wilkins wrote:

> "cshenk"  wrote in message
> news:[email protected]...
> 
> Don't be so tied to battery backups.  It's not a 'can't afford it yet'
> in the way you seem to be pushing.  It's 'may add a 4-6 hour unit' to
> prevent higher peak hour consumption rates'.  With no cut-out switch,
> it's only usable when grid is up.  The potential jackery backup is for
> use during grid down times for basic comfort.
> 
> You seem to address this from 'desirement'.  This is very different
> from my point view which is 'requirement' based.
> 
> The math doesn't work out here on 'bang for the buck'.  You did catch
> that I only produce 92% of my annual needs' right?  A honkin' big
> backup battery setup would not only never fill, some of it would be
> lost whereas I am protected from any loss as it is as that storage is
> nown the problem of the grid.  I get all of it back with no loss.
> 
> ---------------------------
> 
> I didn't check the details, but this is a very competitive price per
> KWH and hopefully a good sign of a continuing downward trend.
>
https://sungoldpower.com/collections/new-years-sale/products/5-12kwh-powerwall-lifepo4-lithium-battery-sg48100m
> 
> Being LiFePO4 it doesn't ever need to fill, the suggested charge
> level for maximum life is 60-80%. It or similar could be charged from
> 120VAC when your rate is low and used when it's high, or saved for
> outages, avoiding the expense of new panels and their installation
> and wiring.
> 
> However the IRS apparently doesn't allow a Form 5695 deduction for
> batteries not exclusively charged by alternate energy. I arranged my
> system so only the batteries for daily cycling I bought used at a
> flea market and didn't claim are charged with a prioritized mix of
> solar then grid when solar output is low or uncertain. In clear
> weather I switch the grid input off and discharge the battery
> overnight. The batteries bought new and claimed are separately solar
> charged in clear weather and saved for outage backup.
> 
> The most common use of the system is to go on battery when a night
> squall line or thunderstorm is predicted, so my electronics are
> isolated from the power line.
> 
> If you have a secure location like an enclosed deck a Jackery etc
> could be charged outdoors from free-standing panels either aimed due
> south or occasionally shifted toward the sun. I made fold-out panel
> rear supports from 1/2" electrical conduit bent into a V. On clear
> days my batteries recharge before noon and the initial 10AM panel aim
> is enough. 100W panels are now below $70.
> 
> Since I build whatever I want I have no experience with Jackerys or
> similar. I do have an old Harbor Freight 5-in-1 power pack refitted
> with LiFePO4 but 18Ah (216Wh) won't run much overnight.

That is similar to my possible 4-6 hour battery.  Not ready to do it in
next year.  Might do it in 2 years.