This is already happening. Used Leaf and Tesla modules are quite expensive because people buy them up for off grid solar setups. You can hook a Tesla or Leaf m

This is already happening. Used Leaf and Tesla modules are quite expensive because people buy them up for off grid solar setups. You can hook a Tesla or Leaf module to a BMS and charge controller that supports lithium like Victron, and have a massive battery for off grid solar and RV's. Not many are doing this, but enough that it keeps used module prices up. Rumors you don't even need to do balance charging on these packs because they're designed for hundreds of kilowatts output and nobody runs them anywhere near that. Lithium batteries get unbalanced due from varying internal resistance between cells. But when you're not drawing anywhere near their rated output, the differences don't matter much.