Thailand’s New Rooftop Solar Policy Creates New Demand for Smarter Energy Measurement

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Thailand’s New Rooftop Solar Policy Creates New Demand for Smarter Energy Measurement

Sep 20, 2026

Thailand’s residential solar market is entering a new stage of development.

In 2026, Thailand approved a new round of its residential rooftop solar power purchase programme. Under the programme, participating households can use solar electricity on-site and sell surplus electricity to the grid at THB 2.20 per kWh.

The programme targets up to 500 MW of total purchasing capacity nationwide. Each residential electricity meter can offer up to approximately 5 kW, with a power purchase agreement of up to 10 years.

This policy is expected to encourage more Thai households to install rooftop photovoltaic systems while creating new opportunities for solar inverters, distribution equipment, energy storage systems, smart meters and electrical installation services.

From Solar Generation to Smart Energy Management

Under a net-billing model, electricity imported from the grid and surplus solar electricity exported to the grid are calculated separately.

Because the export tariff may be lower than the retail electricity price, simply producing more solar electricity does not always provide the best financial return. Households can gain greater value by increasing solar self-consumption—for example, by operating air conditioners, water pumps, EV chargers or other loads during periods of high solar generation.

Energy storage systems can also store surplus solar energy for use during the evening instead of immediately exporting it to the grid.

To implement these strategies effectively, the inverter or energy management system needs accurate, real-time information about:

Electricity imported from the utility grid
Surplus solar electricity exported to the grid
Household power consumption
Solar generation and load direction
Battery charging and discharging
Voltage, current, power and power factor

This is where reliable bidirectional energy measurement becomes essential.

Acrel ADL200N-CT and ADL400N-CT for Solar PV and Energy Storage

Acrel ADL200N-CT and ADL400N-CT are DIN-rail bidirectional energy meters developed for distributed photovoltaic, energy storage and inverter control applications.

The ADL200N-CT is designed for single-phase systems and is suitable for most residential rooftop solar installations.

The ADL400N-CT is designed for three-phase systems and is suitable for larger houses, villas, shops, small commercial buildings and other three-phase solar applications.

Both models can measure electricity flow in two directions, helping the connected inverter or energy management system identify whether the site is importing electricity from the grid or exporting surplus solar power.

Key Benefits

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Bidirectional Energy Measurement

The meters measure both forward and reverse active energy, supporting grid-import and solar-export monitoring.

This allows homeowners and system operators to better understand how much solar electricity is consumed on-site and how much is exported to the utility grid.

Fast Data Response

With a response time as fast as 100 ms for key electrical parameters, the meter can quickly provide power-flow information to compatible solar inverters or energy management controllers.

Fast measurement is especially important for export limitation, battery control and dynamic power regulation.

Easy Retrofit with External CTs

The meters work with external current transformers in current ranges such as 80 A, 120 A, 200 A and 300 A.

Split-core CT options can simplify installation in existing distribution boards because the power cable does not normally need to be disconnected or removed during CT installation.