Data logger budget: data volume, buffer and timestamp error

All values are your assumptions; the defaults are the page's assumed 14-device site, not measured data. Use a point or a comma for decimals. A comma followed by exactly three digits is a thousands separator (1,000 is 1000); 1.000 is rejected as ambiguous.

1. Data volume and buffer

Inverters

Meters

Weather stations

Fields per inverter record

Fields per meter record

Fields per weather record

Bytes per field (4 binary, about 20 text)

Header bytes per device record

Overhead bytes per upload message

Logging interval (seconds)

Upload interval (minutes)

Logger memory (MB)

Usable share of memory (%)

Outage length (days)

Uplink after outage (kbit/s)

2. Timestamp resolution (half-sine day, assumed)

Peak power (kW)

Day length (whole hours, 4 to 16)

Reporting interval

Illustrative only. Data volume counts payload and a fixed overhead per message; compression, retries and protocol headers beyond that are not modelled. One megabyte is 1,000,000 bytes and a month is 30 days. The half-sine day is a smooth stand-in with sunrise at a whole minute; the snapshot is held for the interval and the error is against the sum of 1-minute values. An interval-average logger keeps the energy exactly, so this error applies to snapshot values. Real cloud makes errors larger.