GREATSUNPV Delivers 500kW/1.2MWh Energy Storage System to Estonia – A Practical Solution for C&I Energy Storage

GREATSUNPV recently completed the delivery of a complete containerized energy storage system to a client in Estonia. The system combines a 500kW Megarevo hybrid inverter with a 1.2MWh GREATSUNPV lithium battery pack. It’s designed for commercial and industrial use, targeting three main pain points: high electricity bills, grid instability, and the need for reliable backup power.

Project at a glance

• Location: Estonia

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• System capacity: 500kW / 1.2MWh

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• Inverter: Megarevo 500kW hybrid inverter

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• Battery type: LiFePO4 (Lithium Iron Phosphate)

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• Application: C&I energy storage, peak shaving, backup, renewable integration

How the battery system is built

The battery bank uses our own 51.2V 314Ah LiFePO4 modules, arranged in a straightforward configuration:

• 15 modules in series per string

 

• 5 strings in parallel

 

Total capacity roughly 1.2MWh

This setup gives a stable DC voltage platform, solid cycle life, and the safety you expect from LiFePO4 chemistry. It’s built for daily charge-discharge in demanding commercial environments.

Why this combination works

The Megarevo inverter handles intelligent energy flow – between the battery, grid, and any on-site renewables (like solar). It’s not just a dumb switch; it actively decides when to charge and discharge based on real-time pricing or user settings.

 

The whole system is pre-assembled in a standard container, plug-and-play. No complicated on-site construction, no endless wiring.

Solving real customer problems in Estonia

The client was facing two specific issues. First, rising industrial electricity rates with sharp peak demand charges. Second, seasonal grid fluctuations – not full blackouts, but enough voltage dips to worry about sensitive equipment.

With our system, they now charge during cheap off-peak hours (typically nighttime) and discharge during expensive peak periods. Estimated savings: 20–25% on monthly electricity bills. On top of that, it acts as an automatic backup. When the grid wobbles, the system switches to island mode and keeps critical loads running – particularly important in colder climates where heating can't afford to fail.

What made the difference: our approach

We didn’t just ship a box. Our engineers studied the client’s actual load profile, available space, and local weather – especially low-temperature performance. We tweaked the battery management logic and ran remote simulations before production.

During installation, our team provided live video guidance to local electricians. No expensive overseas trip needed, but they still got real-time support.

“GREATSUNPV was responsive and patient,” the client’s project manager told us. “They explained every detail and up after commissioning.”

This Estonia delivery shows what we mean by “professional and service-oriented.” We're not selling generic hardware. We're providing a tailored energy storage solution that grows with the customer – thanks to the modular battery design, future capacity expansion is straightforward. For GREATSUNPV, it's another step in making commercial storage simple, reliable, and genuinely helpful.

Need a similar setup? Talk to us. We actually listen.

For more information, please contact:

Email: info@greatsunpv.com

Web: www.guruidepv.com