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For others who aren't up on the lingo: "An ATS (Automatic Transfer Switch) for solar is a crucial device that seamlessly switches your home's power between the

• dymk 10mo ago
  And I should clarify that you technically can get away with a less expensive interlock system, but you're still paying a few thousand dollars to have your panel replaced (unless you feel comfortable doing that sort of electrical work yourself). Making a system non-grid-tie is comparatively expensive, that's why grid tie is so common. People think you add solar + batteries and you're ready for doomsday - not quite.