2 of 25 years, the best documented for an inverter (printed by the maker): APsystems DS3
Printed as "2 Years Warranty" on LiTime's US store page for L12V2KW-Y, as archived on January 18, 2025. The badge LiTime prints in the purchase box of the listing; LiTime prints no separate warranty document on the page.
Source product page: Wayback Machine copy of https://www.litime.com/products/litime-2000w-12v-pure-sine-wave-inverter?utm_source=pr&utm_medium=pr-9&utm_campaign=inverter, snapshot 2025-01-18 Checked · Earlier document