Home / Asset care guides / Years 5–10
The first few years of a commercial solar system are usually well watched. The contractor is still around, the savings are new, and someone on the team checks the dashboard. Somewhere between year 5 and year 10 that attention fades — just as the system starts to need it most.
For hospitals, factories, malls and other high-consumption sites, these middle years quietly decide whether the asset keeps paying back for another decade or slowly drifts away from its business case. This guide explains what typically changes, what to watch, and how to plan for it without guesswork.
Several things tend to happen at once in this window:
In tropical climates — including much of the Philippines and Mindanao — heat, humidity, salt air and heavy rain accelerate wear on everything around the modules:
For a CFO or hospital board, the numbers around the system also move. Tariffs change, operating hours grow, new equipment such as imaging or chillers raises the base load, and the original savings forecast stops matching the bills. None of that means the system is failing — but it does mean the original business case needs to be re-checked against real data rather than assumed.
This is also when owners start asking about expansion, re-powering or adding capacity. Those decisions go much better when you know exactly how the existing asset is performing first.
An independent review is most useful before key dates, not after them. Consider one if:
SolarMD reviews production data, bills, design assumptions and site conditions and gives you a plain-English health report — you can see the format in our sample Solar Health Score report. Any repairs or engineering sign-off remain with licensed contractors; our role is to make the evidence clear and, where needed, help you find a qualified EPC or explore partner financing options.
Some drop is normal. Modules typically lose around 0.5% of output per year, so a system in year 6 might reasonably produce about 3% less than when new, all else being equal. Larger drops usually have another cause, such as soiling, shading, inverter faults or monitoring errors, and are often fixable.
Many inverters are designed for roughly 10–15 years of service, depending on the model, installation and operating temperature. Hot, humid and poorly ventilated locations tend to shorten that. It is sensible to plan and budget for replacement well before failure.
Keep as-built drawings, equipment serial numbers, commissioning test results, warranty documents, maintenance and cleaning logs, and continuous monitoring data. These records support warranty claims, insurance, sale of the facility and any future expansion.
No. SolarMD is independent. We diagnose, document and coordinate. Installation, repair and engineering sign-off stay with licensed contractors, and we can help you identify qualified EPC partners where needed.
SolarMD is an independent solar intelligence and lifecycle coordination service for commercial, industrial and hospital sites using around 30,000 kWh per month or more. We diagnose performance, organise the evidence and, where needed, help you find qualified EPC contractors or explore partner financing options. Repairs and engineering sign-off stay with licensed contractors.
Or email hello@solarmd.net · See a sample Solar Health Score report (PDF)
