available rbAmp Standard (STD)
For a single-phase input, a solar installation, a single machine, a small site.
Pick this if:
- Export breaks my charts
- The counter jumps after a reboot
- I need a meter an inverter can read
Which rating? Pick the smallest kit rating above the circuit's maximum current: a 40 A main → 60 A; a 63 A main → 100 A. The sensors are calibrated with their channels — keep each sensor on the channel it is labelled for.
In the box
- the meter in its DIN-clip enclosure
- one current sensor, 60 A or 100 A as selected, calibrated with its channel and labelled
[[OPS: box contents and photo]]
Features
| Feature | Status |
|---|---|
| works without a master (Modbus RTU) | available |
| import and export counters on the meter, saved every second | available |
| current in µA, energy in µWh | available |
| I²C or Modbus RTU (three-position interface switch) | available |
| 13-point float profile compatible with the SDM630/SDM120 Modbus protocol | available |
| eight snapshot banks | available |
| hourly history: the last 7 records survive a restart | available |
| update over the working bus with automatic rollback | available |
| signed and encrypted firmware image | available |
The module has no RS-485 transceiver: the connector carries UART TTL and a driver-enable line for an external transceiver.
Measured characteristics per kit rating: see the table on the STD page.
SDM630, SDM120 and Eastron are names of a third-party manufacturer's meters, used only to state compatibility with their Modbus register protocol.
Installation and safety
STD-UI1 and STD-U3I3 are galvanically isolated: the connector side (VIN, GND, bus) is isolated from the mains measurement inputs. The board comes in an enclosure that covers the lower part with all mains circuits; the upper part with the interface connector is open and isolated; only the voltage-sensor terminal comes out, in a plastic housing. The enclosure has a DIN clip and can be installed in a cabinet.
- one 7-pin interface connector: power, ground, bus, data-ready, driver enable, reset
- voltage input: a thin wire is enough (AWG26–22); a fuse in the L line is mandatory, rated up to 0.1 A
- sensors: the kit comes pre-connected; each sensor stays on the channel it is labelled for; follow the arrow for the import direction
- The measurement inputs connect to mains.
- Install the meter in a closed electrical cabinet.
- Qualified personnel only.
- Switch the mains off before connecting or moving any wire.
- The isolated interface side does not make the meter safe to work on live.
STD is a sub-metering and monitoring instrument. It is not a utility settlement meter and makes no certification claims.
More: STD › Designed for electrical panel installation