i believe 12v batteries when they can no longer be used in a car, you could use for home for another 3 years below are what I think are inverters you can use for that application: https://www.sunstore.co.uk/product-category/solar-accessories/power-inverters/page/2/?srsltid=AfmBOopbh3I0PoJzxZVgkyxhMCcmhkHZSNv4NzdOWkLuU2E8JVFuDkjB victron inverters are well suited for this task.

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