Expanding PV with BESS: Turn photovoltaics into a business
Skip to content Photovoltaics generate electricity. BESS turns it into a business. Expanding PV systems with battery storage maximizes the return on every kWh and transforms a passive power plant into an active source of revenue. Retrofitting is the path from savings to profit.
A few years ago, photovoltaics was the obvious choice: an investment that saves money on electricity and reduces dependence on the grid. Simple, effective, profitable. Today, this equation no longer works.
At midday, the distribution network is oversaturated with energy from thousands of installations, which drives purchase prices down to a minimum. While your PV system is producing at maximum capacity, your production or warehouses have a fixed consumption that uses only a fraction of the output. Without battery These valuable surpluses flow unchecked into the grid – in economic terms: You sell a product below cost, only to buy it back a few hours later for several times the price.
Once the sun goes down, passive PV ends. All evening consumption and morning production starts must be covered by expensive purchases. Half of your solar potential remains unused because without storage, you can only "produce or not produce."
BESS is changing the rules of the game. You are no longer just a passive recipient of weather information, but an active player in the market:
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New legislation (Lex OZE III) places greater responsibility on resource owners. From July 2025, every PV plant must have agreed deviation liability with a trader. BESS itself does not replace this legislative framework, but it significantly increases control over production and consumption. Thanks to the ability to cover deviations and manage surpluses, PV plant operation is more stable and predictable for both the trader and the company itself. Stable and predictable performance means greater operational reliability and professional energy portfolio management.
Many companies postpone expanding their PV systems due to concerns about technical complexity or the need to shut down production. However, the reality is different. Retrofitting—i.e., the additional integration of BESS into an existing system—can be done without having to shut down your machines for days on end.
The process begins with an audit of the current state. Installation time depends on the size of the system. The actual "connection" to the main switchboard is a matter of a short, pre-planned technological break lasting a few hours, which can be scheduled for the least busy time. Once the hardware is in place, it is connected to EMS and it will immediately begin optimizing energy flows between the PV system, battery, consumption, and grid.
The key point is that BESS can be integrated into existing infrastructure without the need for major construction work. The connection method is always designed individually according to the technical conditions of the site. Your PV system can continue to operate without restriction. Battery storage thus represents an intelligent extension of the system that utilizes existing infrastructure and adapts to specific operational needs.
Owners of existing photovoltaic power plants hold a huge trump card in their hands: existing infrastructure. While implementing a new energy source on a greenfield site today means months of paperwork and uncertainty, retrofitting BESS builds on the foundations you already have. For your company, this means Faster start-up and lower capital expenditure (CAPEX).
Do you have a photovoltaic power plant? Make the most of its potential. We offer energy solutions that transform savings into active income.
