Question: What happens to the liquids once they have been used up and depleted? Is there a "recharge" procedure? If they can be reused, how many times before they become disposal waste?
The liquids are reusable, and are charged and discharged repeatedly without needing to replace the fluids. In other words the system is closed with respect to mass, only electrical energy (and minor amounts of thermal) are transferred in and out, reversibly. Flow batteries are similar to so-called reversible or regenerative fuel cells for this reason.
The answer to how long it lasts depends on many factors, and we hope to provide a clearer picture of that in our work.
In a well-designed system, they can last extremely long in comparison to, say, lithium-ion batteries. This is because flow batteries have different degradation pathways that are less severe and, if present, can usually be overcome through other solutions (e.g. electrolyte rebalancing, see ESS's "proton pump").
Currently reading through these posts, feel free to ask questions. Great to see interest.
FYI, I am quitting my postdoc job in two months to work on this full-time, which should help the rate of progress, but my main source of income will stop. We hav ea small but it will only cover a few months of full-time work.
If you want to support the project financially we have an Open Collective here: https://opencollective.com/fbrc/donate
We'd really appreciate any support you're able to give, which we'll use to push this open technology as far as we can! We are planning to start work on a much bigger stack after the kit.