Coreen -
I have an 'off-grid' solar home here in Maine, and we replaced our inverter in 2009, with a Trace 2500. After 20 years, it was acting a bit 'funny' ... so I called the Trace folks on the west coast, who informed me that the original warranty was only for 10 years ... and that I should just be happy and buy another inverter ! Well, I decided to check all the components in our system, and did a few small adjustments, and the inverter did respond ... I'm still using the same Trace, now for over 23 years ! I have another inverter (used Xantrex), available for if and when the Trace poops out ! Good luck with your SMA model ! It may be difficult to find a 'service' person for 'any' inverter that old ! Be well, and get a 'backup' inverter to have on hand !
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John Burke
Director, MESEA, Maine
Maine Solar Energy Association; Downeast Alternative Design Solar, Inc
Jonesport ME
dadsolar@yahoo.com------------------------------