there is a device called alternator charger https://www.theverge.com/24248887/ecoflow-alternator-charger-review-boondock-power – EcoFlow’s Alternator Charger helps keep all your tools and toys charged when driving away from civilization. https://intelligentcontrols.io/blogs/technical-articles/how-to-charge-batteries-off-your-engine-and-stock-alternator – How to Charge Batteries Off Your Engine and Stock Alternator
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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. Other Notes https://diysolarforum.com/threads/interfacing-lead-acid-batteries-with-inverter.61778