Your solar, your meter and your switches, read where they report and priced at your tariff

Nobody can say what the solar system saved last month, or what the power cost.

Each site's day is read from its inverter, battery and meter and priced at its own tariff, time-of-use and seasons included: what was bought and when, what was sold, what the sun saved, and what the slips say was paid for power, prepaid tokens and generator diesel included.

Needs: Your inverter or meter connected on the equipment page, and your tariff typed off your bill (or looked up, in the US and Canada).

A month of power in money, on one page, without a spreadsheet.

The battery sits full at night while the business buys from the grid.

The efficiency officer compares each night's buying with how low the battery ever went, and says how much a lower reserve would have covered, priced at the night rate; the same for midday solar sold cheap and buying in the tariff's dearest hours.

The setting that costs money is named, with what it costs a year.

Load-shedding catches the business with a flat battery.

A business follows its area's live load-shedding times, and when a block is coming with the battery low, the officer says to charge it now, before the block starts.

Needs: In South Africa, Skynat's EskomSePush licence; anywhere, the times can be typed instead.

The block finds the battery charged.

The geyser heats at night on bought power while the panels sell their midday solar for little.

A switch that runs a heavy load at night is named where the same site sells midday solar, and it can be switched from here, on a timer or for an hour, only when the owner allows it, inside the owner's limits, with every change recorded and read back.

Needs: A Shelly, Sonoff, Tuya, SmartThings or Home Assistant switch on the geyser.

The geyser heats on the business's own sun.

A cold room fails at 2am and nobody knows until the stock is lost.

A temperature sensor fills the business's own cold-room check at its interval, and at once when a reading leaves the limits the business set, so the failure is on the record and the business is told the way any failed check tells it.

A temperature log that keeps itself, and a warning at the hour it matters.

Services fall due by the odometer, and nobody reads the odometer.

A connected car or tracker (Tesla, most makes through Smartcar, Geotab, Samsara) is linked to its fleet vehicle, and its odometer counts for the services due.

Services booked by the kilometres actually driven.

The clock at the door and the timesheets never agree.

Punches on a ZKTeco BioTime clock become each person's clock-in and clock-out by their number on the clock, taken once however often they are read, and numbers nobody is matched to are named.

Needs: BioTime reachable at a secure public address, and each person's number on the clock.

Attendance from the fingerprint at the door, not from memory.