For an 8kw system with 2 PowerWalls: ~$58k, or ~$47k after ITC.
For a 13.5kw system with 3 PowerWalls: ~$79k, or ~$62k after ITC.
There is no written guarantee, as “All financial values are estimates” and this is only a proposal and not the actual contract.
Will they quote it without powerwalls? Is the wall a requirement to doing a V3 project?