Sunsynk CSV Downloader

CSV columns: datetime, pv_production_kWh, pv_used_onsite_kWh, pv_exported_kWh
Half-hourly kWh (energy per 30-minute period). ~5-minute readings are averaged and scaled to kWh.
pv_production_kWh: solar energy generated. pv_used_onsite_kWh: solar consumed in building or stored in battery. pv_exported_kWh: solar sent to the grid.
For single-inverter sites, recent figures are calibrated to Sunsynk's metered daily totals, so monthly totals match the portal. Multi-inverter sites use an estimate (~5% on export).