What maintenance does a remote solar power system need?

The maintenance regime for a ModX2 is built around minimising site visits rather than eliminating them:

Interval	Activity
Quarterly	Visual inspection
Six-monthly	Electrical connections, battery health check, firmware currency
Annually	Solar panel cleaning, enclosure seals and filters, comprehensive service

Two practical points matter more than the schedule itself. First, most of what a quarterly visual inspection used to catch is now visible remotely, generation trend, state-of-charge behaviour, alarm history and load drift all show up in the monitoring data, which lets you convert calendar-based visits into condition-based ones and cut the number of trips.

Second, keep the logbook. Where a warranty depends on evidence of correct operation, the service record and the monitoring log are the claim. Abnormal findings should be reported promptly, because a fault left running is a fault the warranty may not cover.