Storage capacity needs a job
Use interval data to test how much daytime surplus is available and how much electricity the property uses after sunset. Seasonal homes can leave a large battery underused for much of the year.
Backup duration depends on usable energy, output, live loads and solar conditions. A proposal should identify essential circuits and changeover behaviour rather than promise whole-home autonomy without limits.
Installation and handover
Confirm the proposed location, temperature exposure, communications, isolation equipment and compatibility with existing or new solar. The owner should receive monitoring access, serial records, commissioning evidence and a clear warranty route.