A farm in Žarnov, eastern Slovakia, already used solar power to cut its energy costs. By adding a 60 kW / 120 kWh SolisStorage EverCore C&I battery system to the existing PV installation, the farm increased its energy savings from around 45% to up to 80%.
The starting point
The farm's photovoltaic system was already delivering savings. But solar production peaks around midday, while a farm needs energy from early morning to late evening. Without storage, only the power used at the moment of production could lower the energy bill.
The solution: SolisStorage EverCore
Instead of adding more panels, the farm added battery storage. The SolisStorage EverCore C&I energy storage system was connected to the existing installation, so surplus solar energy is stored and used later. EverCore highlights:
- LFP battery cells rated for 8,000 cycles
- Integrated PCS and energy management (EMS) in one system
- Built for outdoor use: IP66 inverter, IP55 cabinet, C5 anti-corrosion
- Scalable up to 1.25 MW / 15.66 MWh as energy needs grow
The results
| PV only | PV + EverCore | |
|---|---|---|
| Battery storage | None | 60 kW / 120 kWh |
| Energy savings | approx. 45% | up to 80% ★ |
| Use of own solar energy | Only at the moment of production | Surplus stored and used later |
Results as reported by Solis for this project. Actual savings depend on the consumption profile, PV system size and energy tariffs.
What this means for farms and businesses
If you already have solar panels, battery storage is often the most direct way to get more value from them. Energy produced at midday powers your operation in the evening and early morning, so you buy less electricity from the grid, without installing a single new panel.
Planning storage for your farm or business?
ONSA Plus supplies SolisStorage EverCore systems to installers and businesses across Europe and helps with system sizing and quotes. Tell us about your site and we will recommend the right configuration.
Frequently asked questions
Can battery storage be added to an existing solar system?
In most cases, yes. On the farm in Žarnov, EverCore was added to a PV system that was already in operation. An installer reviews the existing inverter, grid connection and consumption profile to choose the right setup.
How much can a battery increase energy savings?
It depends on how much energy you use outside peak solar hours, the size of your PV system and your tariffs. In this project, savings rose from around 45% to up to 80%. Sites with high morning and evening consumption benefit the most.
What sizes does SolisStorage EverCore come in?
EverCore is a modular commercial and industrial system. This farm uses 60 kW / 120 kWh, and the platform can scale up to 1.25 MW / 15.66 MWh by combining units.