A case study published by TCL Solar on 1 October 2026 describes an off-grid borehole retrofit at a farm in Burgos, Spain. The installation retained a 34.56 kWp photovoltaic array and added 100 kWh of lithium-iron-phosphate battery storage.
From direct pumping to a hybrid system
The remote borehole supplies a 60,000-litre buffer tank and the farm has no grid connection. The original direct-solar system was installed in 2015. The later retrofit added a second borehole pump, storage and control equipment while keeping a diesel generator as backup.
The reported architecture coordinates three variable-frequency drives, level sensors, a programmable logic controller and remote alarms. Battery status can influence when a pumping cycle starts, and stored energy can support pumping when clouds reduce PV output or after sunset.
What the case suggests
The case illustrates a design path for sites where expanding the PV field is harder than shifting surplus solar energy to the time when water is needed. It is a supplier case study, so the reported performance should not be generalized without checking the local load profile, pump duty point, battery sizing and backup requirements.
Aquasolar did not participate in this external retrofit. The project’s relevance is the system-level role of controllers, storage, tank capacity and monitoring around a solar pump—not a claim about Aquasolar equipment.
FAQ
What was retained at the farm?
The retrofit retained the existing 34.56 kWp PV array and added battery storage rather than immediately expanding the array.
How much storage was reported?
The case study reports 100 kWh of lithium-iron-phosphate battery storage.
Where is the source?
TCL Solar case study, published 1 October 2026.
