Have a Renogy product we purchased just over a year ago that started to exhibit performance problems over the last few months. The situation escalated to the point we have almost no output in good conditions. Renogy no longer offers this particular product which raised a red flag, so fired off a firm but polite note to them via their web pages contact form requesting some input and possible resolution.
Within 24 hours, I received a call from Renogy apologizing for the situation, and offering to either replace the defective panel with one of equal wattage, or a full refund.
Can't ask for more than that. They are sending me a new panel, and prepaid shipping
slip to send back the old one.
Nice to find a company that stands behind their products.