Read a bit more on these. Turns out they can switch between storing and producing energy very quickly, reaction time below 1 second. Many other types of batteries need to "rest" in between cycles to avoid or reduce internal deterioration.
They are guaranteed for 20k-100k cycles.
Efficiency is 70-80% .
Also, there is no danger if the '+' and '-' liquids accidentally mix - no overheating, no explosion.
Quote:
Originally Posted by jeff5may
The liquid fuel energy density is around 25 to 50 watt hours per liter for the common ones. If you have a spare empty warehouse or barn, that's probably enough space for all of the equipment.
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I saw a commercial flow battery with 35 Wh per liter. For home needs (10-20 kWh) this is 300-600 liters, which would take up a corner in the basement.
A larger commercial system (120 kWh) weighs 13 tons and has dimensions 5.8x2.2x2.8 meters, so indeed utility-sized systems (100-500 kWh) would need a large room or separate building.