low cost heat storage/battery

[lancaIV]

https://www.google.com/search?client=firefox-b-m&q=granit+preise+pro+tonne&oq=granit+preise+pro+tonne&aqs=heirloom-srp..0l3
Earth rock = "granite" prices beginning with 80 Euros/90 USD per ton material


1 metric ton cement 130 USD

https://www.statista.com/statistics/219339/us-prices-of-cement/
tin( not thin)  foil

13 metric ton transformed material as thermal battery for 700-3500 KWh( 70 units as demonstration example) propagated heat capacity

10-50 KWh heat storage per "battery"-unit, capacity storage temperature dependent
http://circuminvent.com/low-cost-thermal-battery/
With 3500 KWh heat storage capacity and by 13 metric ton material and by average industrial/gross-selling prices + transport-costs : pure material costs based = 1 USD per KWh heat storage capacity

transformation costs( manufacturing/production) and estimated end-price by Stefan Nystroem :
10000 USD for 700- 3500 KWh heat capacity ~ < 3 USD per KWh heat storage capacity


Low cost solar heat as possible heat source :
https://judbarovski.livejournal.com/133020.html
Included heat to electricity option !



Later instead parafin :
Phase-change material : silicon 900° to 1600° Celsius = energy storage capacity improvement
https://www.forbes.com/sites/natalieparletta/2019/04/03/new-thermal-battery-could-be-a-game-changer-for-storing-renewable-energy/#1d3480ff4f95



Older up to 10 KWh/Kg -3000° Celsius molten carbon- high temperature battery
https://worldwide.espacenet.com/publicationDetails/biblio?CC=WO&NR=9907804A3&KC=A3&FT=D#

[sm0ky2]

I think the industry is just going with salt
comparatively just as cheap, and easier to work with
Molten salt holds its' heat longer

[lancaIV]

smokey, the industry has to deliver to the deepest possible price or their extincton is allowed. !
Cheaper than D. IY. -concepts or alternatively with higher quality ( if possible) !

What in the last 5 decades the universities and industry labs did as R&D  and what they actually are in exploring
https://www.google.com/search?q=betonkugeln+als+waermespeicher&ie=utf-8&oe=utf-8&client=firefox-b-m
is in competition/ concurrence with D.I.Y.-concepts  for the deepest possible price for the endconsumer,by needed safety standarts !

In the last decades there were many overestimated producte ,also with " inter-/national award"- granted, which commercial failed  ! TOO expensive related energy low prices. !

latent heat salt storage( f.e Glauber" salts: US solar homes pioneers in the 50/60' ) ; sand boxes under buildings, zeolith storage,  Michel-Trombe black Beton/ cement wall, beton/cement roof with ( scratch)- metall particle filling ,.......

10000 USD for 700-3500 KWh ~ 3-15 USD/KWh and several decades long functionality is a good comparison" benchmark/target" for the industrial competitors. !