Unless you install a fairly pricey battery system in addition to the solar array it doesn't help with blackouts at all. When the grid goes down the inverter sh

Unless you install a fairly pricey battery system in addition to the solar array it doesn't help with blackouts at all. When the grid goes down the inverter shuts off and the whole system produces no power. Adding the battery increases the payback window, often adding 50-100% to the hardware costs of the install. Plus they are in very short supply currently, so including a battery in your build may push it back several months.