Folks, I'm building a power board and a control board for an obsolete inverter. The inverter has an input of 24V and an output of 120VAC. It's a very popular inverter which has a long history of use in the Motorhome industry. It is not grid tie. The oldest of these inverters is exceeding 25 years and power board failures are becoming more and more prevalent. There's clearly a market for my aftermarket boards but I'm not sure what type of UL or similar certification might be required or how to proceed. For instance, would UL be interested in testing my boards within the OEM's enclosure? How do folks typically go about offering aftermarket electronics boards and components for obsolete products?
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