Well, exclude the wetter-drier effect on the batteries. That was facetious.
Seriously though, the grid back-up battery couldn't handle the heat and the automotive batteries have serious performance problems in the cold.
And don't go running to your favorite Chinese vanadium pentoxide (98% pure) dealer. The one year chart looks like a pump-n-dump.
From PhysOrg, Feb
Italian entrepreneurs who migrated to Stony Brook University's energy incubator to form an innovative-battery startup are planning to take on the Powerwall of Elon Musk's Tesla Inc.
Their Stony Brook company, StorEn Technologies, is adapting vanadium-flow batteries—typically the size of shipping containers and found in utility or industrial settings—for light commercial or household use.
StorEn's battery units, about the size of a large, cylindrical vending machine, could be used as a backup in case of a power outage.
Chief executive Carlo Brovero said the entrepreneurs joined the Clean Energy Business Incubator Program at Stony Brook in 2016 after considering Northeast incubators from Boston to New York City. They founded StorEn the following year.
"It's very much focused on energy and energy storage," he said of the university's incubator program and Advanced Energy Research & Technology Center.
The New York State Pollution Prevention Institute at the Rochester Institute of Technology and other partners are testing a StorEn prototype battery at the energy center to "validate" the technology, said David C. Hamilton, executive director of SBU's program and director of operations at the center....
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