1. How a meter, an FTU, and a rooftop inverter stay online
A smart grid covers smart meters, distribution monitoring, renewable grid connection, and load forecasting. Meters, FTU feeder terminals, DTU distribution terminals, and distributed energy report over 4G or NB-IoT, and the same link feeds SCADA and AMI (advanced metering infrastructure). Distribution automation has to collect voltage, current, and switch state as they change, for fault location and remote control. Distributed PV and storage need grid-connection monitoring and dispatch. The grid underpins daily life and the economy, so the link has to be reliable and secure, and it has to meet MLPS. SimtoLink supplies power companies with 4G and NB-IoT SIMs, VPDN, a data pool, and an API into the power platform.
2. Meters, distribution terminals, rooftop generation, and load
Meters, distribution, renewables, and dispatch do not need the same bandwidth or the same freshness:
Smart meters and AMI
NB-IoT or 4G meters report consumption, demand, and power factor. AMI covers remote reading, fee control, and line-loss analysis, at about 20-100MB a month.
Distribution automation and FTU/DTU
FTU and DTU terminals report voltage, current, and switch state over 4G, for fault location and remote control.
Distributed PV and storage
Distributed PV and storage inverters report generation and grid-connection state over 4G, for dispatch and subsidy metering.
Load forecasting and dispatch
Transformer-area monitors and load-forecasting devices report over 4G, for peak shaving and valley filling, and demand response.
3. What the grid link has to guarantee
- A link that does not drop the repair: Distribution monitoring and fault location have to report as they happen. A dropped link delays the repair. Cache locally and backfill after the link returns, so the record stays complete.
- Commands that cannot wait: FTU and DTU control commands, load forecasts, and demand response need low latency. Distribution automation is sensitive to delay.
- Coverage out to the roof and the suburb: Distribution terminals and distributed PV often sit in the suburbs or on a roof, so more than one operator is what holds coverage.
- Security and compliance: The grid underpins daily life and the economy. It needs a VPDN, national cryptographic algorithms, and MLPS. SimtoLink provides financial-grade protection.
- The systems that close the loop: An API into SCADA, AMI, the dispatch platform, and the billing system, covering distribution automation and renewable grid connection.
4. Meters, FTUs, inverters, and the transformer area
Bandwidth and freshness differ by device. Weigh the device and the job. Use the table as a starting point:
| Use | Recommended network | Why it fits |
|---|---|---|
| Smart meters and AMI | NB-IoT / 4G | Batch reading on NB-IoT; load curves on 4G |
| FTU and DTU distribution terminals | 4G | Live monitoring, remote control, fault location |
| Distributed PV and storage | 4G | Generation, grid-connection state, dispatch |
| Transformer-area monitoring and load forecasting | 4G | Live data, peak shaving and valley filling, demand response |
5. How much a grid device uses
A device typically uses about 50-300MB a month. An NB-IoT meter sits around 20-50MB. Distribution terminals and PV inverters sit around 50-200MB. Pool SIMs by device type, keep 20%-30% spare, and meet VPDN and MLPS.
6. Security for a system people depend on
The grid underpins daily life and the economy, and the security level is extremely high. It has to meet MLPS, with a VPDN, national cryptographic algorithms, and an IP allowlist. SimtoLink provides financial-grade protection and real-name registration together.
7. 4G on the feeder, NB-IoT on the meter
For the smart grid, use 4G IoT SIMs on distribution monitoring, PV inverters, and storage BMS units, and NB-IoT on meters. Distribution and renewables have to report as they change. A large meter rollout belongs on NB-IoT. The plan is built around 99.9% network availability, a data pool, and an API into SCADA and AMI.
8. From a coverage check to the wider grid
Take a grid rollout through these stages:
Pick the SIM by device type. Check coverage in the target area, set the VPDN, APN, and allowlist, and alert at 80% of the data allowance. SimtoLink covers the work from the survey through the wider rollout. Contact us for a plan sized to the network.