Grid-tied. Designed for ~net-zero annualized
electricity I/O to the LA DWP. Excess produced during sunlight hours from the
4.14 kW of panels is credited back to the home at night. Month-to-month
over/under slop is averaged out over a year. (The system is designed to
reconcile to zero.) DWP acts as the diurnal load leveler &
multi-gigafarad ripple filter. With the exception of N-hour DWP power outages
after dark there will be no need for batteries near term, although the basement
layout will be provisioned for two days battery capacity if and when I want to
add them for earthquake mode (later, when batteries get cheaper). Home IT
systems are already on a UPS good for one hour.
Adding 1-2 EVs may require more panels to maintain
breakeven, depending on driving/charging habits. But at that point the
V2G systems will have further matured and the overall equation will be somewhat
different, affecting both the panel and the battery design requirements.