Try towing a van with an EV, page-49

No worries, I do like the idea of flow batteries because they effectively last forever, are expandable at minimum cost, are completely safe and they don't care about temperature or being kept at a high or low SOC. They are heavier and bulkier than Lithium but that isn't important for a fixed installation, the only real negative for me was the Round Trip Efficiency. The RTE of Lithium battery storage is 85 to 95%, Flow batteries are 65 to 75%, similar to pumped hydro and Hydrogen is 30 to 40%. Needless to say I don't understand Twiggy's infatuation with Hydrogen and that is before the storage and transport problems.