The main components of an Iron Sun Power Supply- the nickel iron batteries and PV panel- will perform for many decades, although their output will decline after 40 years or so. They are capable of putting out a useful amount of power for 80 years or more.
The solar industry considers PV panels to have a degradation of .6% per year, meaning that after fifty years, a PV panel's output should be 70% of its rated capacity.
Our nickel iron battery manufacturers rate their battery to have a useful life of about 40 years. If maintained properly, NiFes will store a useful amount of power for longer than that. We revived an 80 year old NiFe that had been neglected for years, and it still performs at 50% capacity.
The small components of an Iron Sun box- switches, fuses, outlets, etc- might fail at some point, while the main components are likely still functional. If your Iron Sun Box is not functioning, contact us at info [at] livingenergylights.com and we can help you diagnose the problem, source the replacement parts, and repair your box. Replacement parts for the smaller components will cost you $5-10 (on average) plus shipping.
You can also find videos and instructions on using, maintaining, and troubleshooting our products on the Technical Support page.