11. Choose Your Battery22. Choose Your System Size33. Choose Your Grid Type44. Choose Your Solar Array Choose Your Battery Lithium Iron Nickel Iron Choose Your System Size Mini - Minimal electrical needs (up to 3 kWh) Small - Small power system for critical loads (up to 6.5 kWh) Medium - Small full time residence (up to 13 kWh) Large - Average size residence (up to 26 kWh) Extra Large - Powerful electrical loads (up to 43 kWh) Choose Your Grid Type Sell to Grid - Sell surplus solar energy to the grid, then use the grid as backup on cloudy days. Requires a net metering agreement with your utility. Off Grid / Backup - Electricity first from solar and battery, then automatically switch to generator or grid as a backup. Choose Your Solar Array Top of pole mount - Seasonal adjustability for optimal solar production Ground mount - Easy to install, easy to maintain Roof mount - Ideal when space is limited on your property.