EENOVANCE describes a 2026 PV-plus-storage upgrade for an irrigation station in Shumen, Bulgaria. The site operates away from the utility grid and uses six 261 kWh battery cabinets with an existing photovoltaic array and two 100 kW Huawei on-grid inverters.
Designing around pump starting loads
The case study says the system supplies irrigation pumps rated up to 90 kW. It identifies motor inrush, black-start capability and seasonal solar variation as key design constraints. In a fully off-grid pumping system, the energy budget is only part of the problem: the power-conversion system must also establish stable voltage and frequency while large motor loads change.
Why storage changes the operating model
The project uses an energy-management system to coordinate the PV and storage assets on a 400 V AC bus. EENOVANCE reports more than 20 hours of full-load backup from the parallel cabinets and lower generator dependence. Those are supplier-reported case-study results, not an independently verified performance guarantee.
The example is relevant to farms and water stations that cannot rely on a grid fallback. Aquasolar did not participate in this external project. Any comparable design still needs a site-specific load profile, pump curve, battery autonomy calculation and protection study.
FAQ
What is the reported storage capacity?
The case study reports 1,566 kWh using six 261 kWh battery cabinets.
What pump load is described?
The site is described as powering irrigation pumps rated up to 90 kW.
What is the source?
EENOVANCE, 2026 project case study.
