Genius US company makes iron battery that competes cost wise with lithium!

Not the video I wanted but you get the idea. ESS makes iron/saltwater flow batteries that go into 40' shipping containers. Thus offering 50 kilowatts of energy. "Enough to supply a block for four hours." Plus the price competes with lithium!
Simply built, the parts are available at Home Depot. Did I mention that the price competes with lithium?
https://www.youtube.com/watch?v=ovZXBXtG9no
Simply built, the parts are available at Home Depot. Did I mention that the price competes with lithium?

First Bank:16 180 watt Grape Solar with FM80 controller and 3648 Inverter....Fullriver 8D AGM solar batteries. Second Bank/MacGyver Special: 10 165(?) watt BP Solar with Renogy MPPT 40A controller/ and Xantrex C-35 PWM controller/ and Morningstar PWM controller...Cotek 24V PSW inverter....forklift and diesel locomotive batteries
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https://www.essinc.com/energy-storage-applications/off-grid-microgrid/
A 17,000 lb semi-trailer full of gear gets you a 40 kWw / 400 KWhr system ....
Offgrid in cloudy PNW
MacGyver'ed museum collection of panels, castoff batteries and generators - ready for state of art system install ....
https://redflow.com/applications/residential/
This article has some interesting information with regard to flow batteries not being practical in small scale residential applications.
https://www.sciencedirect.com/science/article/pii/S1876610216310566
Random reading material should one be interested.
Second system 1890W 3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.
5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
I am available for custom hardware/firmware development
Lithium batteries can be made from a broad array of materials, few of which are cheap. Iron batteries are made of iron with nickel plating. From here - that looks like it should be relatively inexpensive.
As far as I know, iron solar batteries are comparable in size to lead solar batteries. This video depicts an industrial battery. Going off of memory here.