The PY.FLEX AC provides sites with a ready-to-connect storage solution that lowers demand charges, keeps power on and makes better use of the electricity generated on site. Battery, power conversion system and controls are built in. Underneath is sodium-ion chemistry with reduced thermal runaway risk, and liquid cooling that keeps output predictable year after year.
Ready for your site
What the site actually needs
Lower demand charges, power that stays on, and more use of the solar already installed.
Where in-house integration is not the plan
Not every site has the engineering capacity to specify inverters, controls and approvals alongside running its own operations.
One system, one supplier
Battery, power conversion and controls arrive together, ready to connect.
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Then discuss the details with our experts and plan your implementation.
Ready when you are
Complete system
Battery and power conversion in one cabinet, from one supplier
Proven safety
Reduced thermal runaway risk
Stable under pressure
Reliable across a wide range of ambient temperatures
Built tough
Engineered for demanding environments
Grow on demand
Capacity can be added step by step
Independent by supply chain
Built without lithium and without cobalt
PY.FLEX AC
A sodium-ion energy storage system with integrated grid-connected power conversion, scalable in both power and capacity.
Built for where power matters
Self-Consumption Optimization
Backup Power
Independent Power Supply / Microgrids
Low Voltage Grid Support
Energy Arbitrage
EV Charging Infrastructure – Overnight & Grid Support
Peak Shaving
Keep reading
PHENOGY in the Press: Resilient Energy for Armed Forces
Sodium-ion battery storage makes energy supply more resilient: robust in operation and at extreme temperatures, independent of vulnerable supply chains. The military benefits too: in our contribution to the "Future of Defence" supplement, we explain why the technology is ready for the field. The supplement was published in September 2026 in the Frankfurter Allgemeine Zeitung, one of Germany's leading national newspapers (in German).
‘This Award Shows That We Are on the Right Track’
The market is moving in a direction for which PHENOGY is well positioned.
7 Reasons PHENOGY Became the First Sodium-Ion Winner
Sustainable, Safe, and Proven in Practice
Disclaimer: Layout and specifications are subject to change as part of our continuous improvement process.
Energy Arbitrage: Our battery storage enables arbitrage by storing low-cost or self-generated electricity and using it when market prices are high, helping to optimize costs and reduce CO2 emissions, while enabling additional value through energy trading.
External Communication / Aggregator: Communication with external systems or commercial aggregators is handled via the integrated inverter and its standard interfaces, used for central control and data transmission to higher-level systems such as energy management systems, monitoring platforms or grid operators.
EMS: An energy management system is available as an option. Refer to the separate EMS document for details.
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