ATESS monitoring with PVBiz

ATESS plants are read through the ATESS cloud with a username and password. There is no share option, so PVBiz uses the login itself and stores it encrypted. ATESS is available on the PVBiz Installer Platform today, where installers and O&M teams monitor fleets across brands. Homeowner subscriptions do not currently include it.

What PVBiz reads

PVBiz focuses on ATESS HPS inverters and takes the latest point of the inverter’s history. That yields output power and phases, frequency, solar power, today’s and lifetime yield, MPPT strings 1 to 10, battery power, state of charge, voltage, current and temperature, today’s charge and discharge, AC and DC temperature, and grid frequency, status, import, export and total power. ATESS field names differ between firmware versions, so PVBiz tries several candidates for each reading. Readings poll about every five minutes and totals refresh hourly.

History

Totals are built from ATESS’s month, year and total energy charts for solar, load, import, export, charge and discharge. On first connect PVBiz goes back to the first year that appears in the yearly chart. A caveat is that when ATESS leaves a value out of a chart PVBiz records zero, so a missing figure can show up as a zero day.

Alerts

PVBiz’s own rules provide inverter offline, plant offline, communication failure and thresholds on the metrics above. ATESS’s own alarms are not imported.

Known limits

PVBiz signs in to the ATESS cloud on each sync and retries if the server says it is busy. Readings depend on the firmware naming described above. There is no control: PVBiz is read-only on ATESS, and Sunsynk is the only brand where it can change inverter settings.