Huawei Inverter and Wallbox: Put Your Solar Power to Work Instantly

If you operate a photovoltaic system with a Huawei inverter and drive an electric car, you may have a straightforward question: Can the self-generated solar power be used directly for charging? The answer is yes, and without additional hardware.

With the right wallbox, the Huawei SUN2000 communicates directly via the home network. The charging power automatically adjusts to the available solar surplus. This article explains which Huawei models are compatible, how the setup works, and what the combination brings in practice.

The short answer: Trydan, the best-selling wallbox from V2C is directly compatible with the entire Huawei SUN2000 series, without additional hardware or intermediary devices.

In principle, any compatible wallbox can be paired with photovoltaic systems. The complete guide to PV integration shows what requirements are necessary.

Why Huawei Owners Have an Advantage When Charging

Huawei is one of the most installed inverter manufacturers in Europe. The SUN2000 series covers most household systems, from 3 kWp to over 40 kWp. A significant advantage: Huawei SUN2000 inverters provide their production data via an open interface in the local network. Wallboxes that support this protocol can communicate without additional intermediary devices.

This means: no separate energy measurement box, no additional dongle, no third-party hardware.

The direct connection works with the entire Huawei SUN2000 series:

Model Series	Power Range	Phases	Typical System
SUN2000-3/4/5/6 KTL-M2	3–6 kW	Single-phase	Small roof systems
SUN2000-8/10/12 KTL-M2	8–12 kW	Three-phase	Standard household
SUN2000-15/17/20 KTL-M3	15–20 kW	Three-phase	Larger roof systems
SUN2000-33/36/40 KTL	33–40 kW	Three-phase	Commercial and large systems

Additionally, integration with the Huawei Smart Energy Controller (EMMA) is possible, which centrally controls the energy flow in newer installations.

Requirement: The inverter must be accessible in the local home network. Most installations from recent years meet this condition by default.

How PV Surplus Charging Works with Huawei

In normal operation of a photovoltaic system, there are two scenarios: The generated solar power is consumed in the household, or it is fed into the grid when more is produced than consumed. The feed-in tariff is expected to be below 10 cents per kWh in 2025, while grid electricity costs between 25 and 35 cents.

PV surplus charging utilizes exactly this difference: instead of feeding excess solar power into the grid, it is directed straight into the vehicle’s battery.

The process:

1. The Huawei inverter continuously measures solar production, household consumption, and grid draw.
2. The wallbox queries these values via the local network.
3. The available surplus power is calculated: production minus household consumption.
4. The charging power is adjusted accordingly, automatically and continuously.

With 5 kW solar production and 1 kW household consumption, 4 kW are available for the electric car. If household consumption increases due to the stove or washing machine, the wallbox automatically reduces the charging power. If it decreases again, the power is increased.

Direct Connection, Without Additional Hardware

The connection between the wallbox and Huawei SUN2000 occurs via the local network using Modbus TCP, an open industrial protocol. The retrieved values include:

• Current solar production (W)
• Total household consumption (W)
• Grid draw or grid feed-in (W)
• State of charge of the Huawei LUNA2000 storage (if available)

Based on these values, the wallbox regulates the charging power in real-time. Neither cloud services nor external servers are required for this. All communication takes place locally.

Setup: Connecting Trydan and Huawei

The setup is done once and requires no networking knowledge. Two steps are necessary: activate Modbus TCP on the inverter and connect the wallbox to the home network.

Activate Modbus TCP on Huawei SUN2000

In newer installations, Modbus TCP is active by default. For older devices, it must be manually enabled:

1. Open the Huawei FusionSolar app.
2. Select the device, then access “Settings.”
3. Under “Communication,” enable “Modbus TCP.”
4. Confirm port 502 (default setting).
5. Note the IP address of the inverter.

Step-by-Step: Configure the Wallbox

1. Open the Trydan app and select “Inverter” brand “Huawei.”
2. Enter the IP address of the SUN2000.
3. Test the connection – the app confirms a successful connection.
4. Activate charging mode “Solar.”

After a successful connection, real-time production data is displayed directly in the app. The setup usually takes less than 10 minutes.

A detailed guide for integrating Huawei EMMA with Trydan is available in the V2C support area.

The Three Charging Modes at a Glance

Mode	Description	When Useful
Solar	Charging exclusively with solar surplus	Vehicle is parked at home during the day
Schedule	Charging at set times	Combination with dynamic electricity tariff
Manual	Charging with fixed power	Immediate charging regardless of solar yield

In solar mode, a minimum current can be set so that the charging process does not completely stop on cloudy days. The minimum current is 6 A, which corresponds to 1.4 kW for single-phase charging and 4.1 kW for three-phase charging.

In addition to the three charging modes, a custom schedule with up to three power phases can be set in the app, separately for weekdays and weekends. For each phase, a time range and a maximum charging power are defined, such as low power during the day while PV generation occurs and higher power at night with a favorable night tariff. This fine control directly combines with the Huawei integration, without disabling solar detection.

Another advantage of the Huawei connection: the complete energy flow is visible in real-time. The app simultaneously shows how much power the PV system delivers, how much is drawn from the grid, how much the house consumes, and how much flows into the vehicle, all in a single overview instead of spread across multiple apps.

In the app, the Huawei integration is directly visible: the complete energy flow in real-time, the individual schedule with power phases, and the active power control, all at a glance.

Increase Self-Consumption: What the Combination Brings in Practice

A 10 kWp photovoltaic system produces an average of about 9,000 to 10,000 kWh of solar power annually. Without an electric car and without storage, the self-consumption rate typically lies between 25 and 35 percent. The rest is fed into the grid.

An electric car with an annual consumption of 2,500 to 3,500 kWh can be charged largely with solar power when optimally utilizing the solar surplus. The crucial factor is when the vehicle is at home: a parked electric car during the day significantly increases the self-consumption rate compared to a vehicle that is only plugged in at night.

Scenario	Charging Amount/Year	Of which solar	Grid Electricity Costs (30 ct)	Savings
Without PV surplus charging	3,000 kWh	0 %	900 €/year	–
With PV surplus charging	3,000 kWh	60 %	360 €/year	540 €/year

For vehicles parked during the day, solar charging rates of 60 to 80 percent are realistic.

Is the Combination Worth It? Costs and Amortization

The Trydan wallbox is available in three variants: 7.4 kW (single-phase), 11 kW (three-phase), and 22 kW (three-phase). Prices start at around 600 euros. Additionally, installation costs by an electrician range from 200 to 600 euros, depending on the effort. No additional components are required for the combination of Huawei inverter and Trydan wallbox.

Example calculation for amortization: With an annual savings of 540 euros and total costs of 1,000 euros, the payback period is less than two years.

What About the Huawei LUNA2000 Battery Storage?

Many newer Huawei installations also include the LUNA2000 battery storage. Its state of charge is considered in the charging control, provided the data is provided via the inverter. This enables a prioritization logic: charge the storage first, then send excess energy to the electric car, or vice versa, depending on the setting.

No Direct Inverter Connection? The Current Clamp as an Alternative

For older Huawei models or systems without network access, the current clamp is available as an alternative. It is included with the Trydan wallbox and is mounted at the main connection.

The current clamp measures the current grid draw or grid feed-in. The wallbox regulates the charging power based on this, without direct communication with the Huawei inverter. The response time is slightly longer than with direct connection; for most applications, this method is fully sufficient.

EVCC as an Alternative to App Control

For those who prefer deeper control, the Trydan wallbox can also be operated with EVCC (Electric Vehicle Charge Controller). EVCC is an open-source solution with a very active community that enables complex charging strategies, such as the combination of solar surplus, dynamic electricity tariff, and storage. For most users, the native app control is the easier entry point.

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