Symphonics with Sungrow
Symphonics with Sungrow to develop a model for standalone batteries connected to the grid
Symphonics, a French scale-up specializing in smart energy management, flexibility, energy recovery, and energy supply, announces the development—in partnership with Sungrow, the global leader in battery storage solutions—of a standalone battery model connected to the power grid, designed to serve as a new growth driver for the renewable energy sector.
This innovation marks a key milestone in the deployment of distributed storage, enabling autonomous batteries, independent of any production or consumption, to be controlled, aggregated, and monetized on flexibility markets, thereby contributing to the stability of the electrical system.
A standalone drum kit, featuring Symphonics intelligent control system
Already an aggregator, flexibility operator, balancing provider, and energy supplier, Symphonics to develop its solutions across the entire electricity value chain.
With these standalone batteries connected directly to the power grid, Symphonics Sungrow demonstrated at the end of the year their ability to manage energy assets in real time, thereby leveraging flexibility in the energy and reserve markets.
Unlike batteries traditionally paired with renewable energy generation, this model is connected directly to the power grid, making it a fully deployable asset for Symphonics trading activities.
For example, installing two 125 kW Sungrow Powerstacks on an existing low-voltage connection could yield an estimated return on investment of between 5 and 6 years for projects installed from the first half of 2026 onwards.
The decline in technology costs, combined with the increasing volatility of energy prices and reserve mechanisms, is making this model more attractive to investors and players in the electricity system.
Performance validated in real-world conditions
The recycling of these batteries imposes particularly high technical requirements, especially in terms of responsiveness.
Teams from Symphonics,Sungrow Europe, andSB ENERGYconducted a field test to validate the control of Sungrow’s Powerstack batteries by the Symphonics platform.
The results confirm the maturity of the model:
- Response time less than 500 milliseconds, compatible with the requirements of the secondary reserve market (aFRR);
- Direct battery control by Symphonics, without modifying the existing system, during both charging and discharging;
- Proven interoperability, enabling optimal utilization of assets directly connected to the network.
With more than 350,000 devices already under its management and recognized as a “Deeptech” company byBpifrance,Symphonics its role as a major player in energy flexibility.
“Decentralized storage, when directly connected to the grid and effectively managed, becomes a major driver of power system stability and economic performance. This standalone battery is fully in line with our vision of a managed energy system that is more efficient, more resilient, and more accessible,” says Mathieu Rochard, founder and CEO of Symphonics. According to Clément Martinez, Distribution Leader for France at Sungrow Europe, “distributed storage is growing by combining technological performance with ease of grid integration. This collaboration with Symphonics that standalone batteries can now be deployed on a massive scale, with effective management and direct monetization in flexibility markets.”
About Sungrow
Sungrow Power Supply Co., Ltd. ("Sungrow") is the world's most bankable inverter brand (BloombergNEF) with over 870 GW installed worldwide as of June 2025. Founded in 1997 by university professor Cao Renxian, Sungrow is a leader in the research and development of energy conversion systems, with the industry's largest dedicated R&D team and a broad product portfolio offering PV inverter solutions and energy storage systems for utility, commercial and industrial, and residential applications, as well as internationally recognized floating PV power plant solutions. With 28 years of experience in the photovoltaic field, Sungrow products power installations in more than 180 countries, supported by a network of 520 service centers ensuring an excellent customer experience. To learn more about Sungrow, visit www.sungrowpower.com.
About Symphonics
Founded in 2023, Symphonics an innovative French scale-up at the heart of the green transition, specializing in the smart management of equipment for the production, supply, storage, and consumption of electricity. Through its connected platform, Symphonics significantly reduce its customers’ energy bills and carbon footprint by automatically shifting their consumption to times when energy is cheapest and has the lowest carbon footprint. Symphonics thus Symphonics “Managed Energy” solutions—including electricity buyback, aggregation, flexibility, and energy supply—to its residential, commercial, and industrial customers. Asan RTE-certifiedoperator and aBPI France Deeptech-certified company, Symphonics authorized to manage the production, storage, and consumption of electricity. With more than 350,000 connected devices, Symphonics individuals and businesses achieve lower-cost, greener energy consumption.
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