Depending on the converter or inverter use, age or like was it buit on a Monday or a Friday there is no way to tell how long it will last. The more high end inverters usually have a better life span than a cheap unit. However when the manufacturer stops supporting your particular unit and it dies, you have no choice but to get a new one. If you are proficient in repairing them and you can get off the shelf parts, and the parts price don't exceed 50% of a new one, there is almost no limit how long you can keep them going.
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