Retrofit PV Plants: Rena5000 C&I BESS Powers a 1.3 MWh Solar Storage Project in Moldova

 Abstract

Targeting the upgrade demand for existing PV Plants, Renac Power leverages the standardised, modular designed Rena5000 C&I BESS to deliver an AC coupled retrofit solution for the 1.3 MWh solar storage project in Chișinău, the capital of Moldova. Addressing key pain points including high energy costs driven by large peak valley price spreads and limited revenue streams for legacy PV plants, the solution unlocks value from existing solar assets via TOU and On/off grid seamless switching. It provides new revenue streams and sets a benchmark for C&I energy transition and PV plus storage retrofits across Eastern Europe.

Market Pain Points

As part of Europe’s energy market, Moldova’s commercial industrial sector is confronted with structural energy challenges. Operational drawbacks of conventional PV plants are becoming increasingly prominent, hindering corporate cost reduction efforts and sustainable energy development.

1. Power tariffs feature significant TOU differences. During daytime, electricity prices drop as low as 0.05 €/kWh, while at night they surge to 0.24 €/kWh. This substantial day night price gap keeps enterprises’ rigid power consumption costs at a high level.

2. Traditional PV plants only support on site self consumption or grid export during daytime. They cannot cover high tariff night time operation scenarios. Surplus power cannot be effectively stored and utilised, limiting maximum generation value and resulting in persistently low return on investment for the PV Plant.

3. Driven by local C&I capacity upgrades, power demand keeps growing. Legacy PV plants lack sufficient flexibility and intelligence and struggle to satisfy future diversified, high reliability power requirements. C&I BESS are urgently needed for system retrofits and upgrades.

How do we resolve the dilemma: surplus solar power by day, expensive grid power shortage at night? A smart, expandable and highly adaptable C&I battery energy storage system (BESS) holds the key to unlocking higher returns from existing PV installations.

AC Coupled Retrofit: Unlock New Value of PV Plant

Tailored for this retrofit project, Renac Power deployed the Rena5000 C&I BESS. Without modifying the original PV hardware, the system upgrades a conventional solar plant into a PV+ESS station, unlocking incremental revenue from the pre existing PV Plant.

· System Configuration

· Energy Storage System: 5 × ESS 261

· Grid tied Inverter: 12 × R3 50K

· Energy Management Unit: 1 × EMB 100

Key Operational Strategies

✅ TOU: Charge batteries with low cost surplus PV energy during daytime; discharge stored power during high tariff evening peak hours to capture price spread benefits.

✅ Total Power Intelligent Control: Dynamically match on site load and stabilise plant output power.

✅ AFCI Protection: Prevent reverse power export to the utility grid, eliminating operational losses and grid code compliance risks.

Core Capabilities Built for C&I All Scenarios

Centred on the ESS 261 unit, the Rena5000 C&I BESS integrates an STS, and PVS adopting fully standardised all in one design. It balances safety, flexibility and cost efficiency, delivering five core features optimised for PV plant retrofits:

1. Intelligent AFCI & Precise Power Control Automatically store surplus PV generation and regulate total output power, avoiding transformer inrush impact and stabilising power supply quality.

2. Cell level Liquid cooled Thermal Management Reliable operation under extreme ambient temperatures from 20 °C to 50 °C. Accurate cell temperature control enhances system safety, efficiency and service lifetime.

3. High Performance, Powerful Capabilities Transformerless three phase four wire design supports off grid operation with complex loads, including inductive and half wave types.

4. Turnkey Delivery, Rapid Deployment All in One system design significantly reduces on site installation and commissioning complexity. Standardized and modular design enables flexible configuration, dramatically shortening project delivery timelines.

5. Multi Energy Synergy, Scenario Empowerment The system supports multiple operational modes—including TOU(Time of use)/Demand Management/emergency backup—delivering full lifecycle energy value.

Conclusion

The successful commissioning of this 1.3 MWh solar storage project in Moldova fully validates the outstanding performance and strong economic viability of Rena5000 for AC coupled retrofits and large scale C&I storage deployments. It delivers a replicable, field proven reference for value enhancement of existing PV plants across Eastern Europe.

Moving forward, Renac Power will keep delivering safe, high efficiency and intelligent energy storage products, empowering global energy transition and low carbon sustainable development.

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