Hi Ernests, apologies for delay in response to your question. It may be feasible for you to add a second battery if you have 3 phase power at your home. If you were to install a 2nd Tesla Powerwall, you would likely need 10-15kW of solar to be able to charge two batteries of that capacity (and you may not need an additional 13.5kWh of storage). If you do end up adding a 2nd battery, it doesn't affect participation in our VPP (Please note - AGL does not currently offer installation of a 2nd batte ...