Sunny Highpower Storage is a series of industrial-grade battery inverters (grid-tie) designed for large-scale energy storage systems and hybrid PV+ESS power plants, where availability, rapid scalability, and stable operation under challenging conditions are paramount. A key advantage is the modular architecture-devices can be connected in parallel and projects can be scaled in stages without reconfiguring the entire infrastructure. This is particularly practical during modernization efforts, when adding a storage system to an existing PV farm is desired.
Unlike traditional PV inverters, Sunny Highpower Storage does not rely on MPPT (as it does not operate directly with solar panel chains), but rather controls the energy flow between the battery and the grid. The high European efficiency means lower losses under typical operating conditions, resulting in more energy delivered to the grid and better profitability for grid services.
A significant feature is the communication and integration with higher-level systems (including via Ethernet, supporting standards such as Modbus) and cybersecurity in utility projects. This series is intended for commercial and industrial installations as well as PV plants with energy storage, where grid connection certificates and industrial-grade warranty conditions are required.
Ranking
Specifications
Pros and cons
Inverters can be connected in parallel (AC and DC), scaling a project from 1 to 5 MW and from 5 to over 40 MWh without replacing the transformer. This enables phased capacity expansion and repowering of existing PV installations without costly grid infrastructure overhauls - a unique capability in the string battery inverter segment.
The 1500 VDC architecture reduces conduction losses compared to 1000 VDC systems, with peak inverter efficiency reaching approximately 98.5%. For storage assets operating on a daily dispatch cycle (frequency regulation, peak shaving), this translates directly into lower round-trip losses and higher ancillary services revenue over the full project lifetime.
The OptiCool™ intelligent air-cooling system maintains full nameplate output at ambient temperatures up to approximately 50°C (122°F) with no power derating. This is a clear advantage over many competing inverters that begin derating above 40-45°C, and is particularly significant for projects in hot climates or containerized deployments with limited cooling capacity.
SMA has implemented a secure product development lifecycle (SDLC) based on IEC 62443-4-1, ISO 27001, and NERC CIP, with a documented Product Security Incident Response (PSIR) process. In the string battery inverter segment for critical infrastructure, this product is among the most broadly certified for cybersecurity - a key differentiator in public tenders and projects subject to regulatory requirements.
Modbus TCP and Ethernet communication are supported natively, with no additional conversion gateways required, reducing commissioning time for integration with upstream systems (EMS, SCADA, DERMS). A unified protocol standard across the entire SMA product line simplifies hybrid PV+ESS projects and streamlines multi-phase capacity additions.
As a European Tier-1 manufacturer, SMA positions the series above the price point of comparable solutions from Sungrow (e.g., ST2752UX) and Huawei FusionSolar in the utility segment - a gap estimated by independent industry reviews (Clean Energy Reviews, SolarQuotes) at 10-20% at the unit cost level. In utility-scale projects where CAPEX drives LCOE, the higher upfront cost requires additional justification in the financial model.
Alternatives
About the Sunny Highpower Storage series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.