About 330 km south of Perth on the southwestern tip of Australia lies a remote avocado farm owned by Torsten Ketelsen. The entrepre neur manages to produce 90 metric tonnes of the popular green fruit each year – completely independently of the public and water supply. The avocados are grown as sustainably as possible and are sold locally.
Avocados require not only a lot of sun light but also large amounts of water to ensure they can develop the optimum flavour. On average, about 1,000 litres ofwater are needed to produce a kilogram of avocados, which contain more fat than any other fruit or vegetable. Since it barely rains in southwest Australia in the summer, Ketelsen operates enormous subterranean reservoirs which fill up with rainwater over the winter. High-performance hydraulic pumps are then used to bring the water to the trees in the summer.
For some years now, the farm has been using large 160 kWh sodium-ion batteries to store electrical energy generated by on site photovoltaic installation, which has a peak power capacity of 99 kilowatts. Due to the materials used, the batteries are very environmentally friendly, but they aren’t powerful enough to overcome the initial power surge of the hydraulic pumps. So the farm required a different solution in order to keep running without public water supplies and a grid connection. Lithium-ion batteries have a significantly higher energy density and can also release their power much faster than sodium-ion batteries. They also charge up much faster than sodium-Ion batteries.
Requirements for a storage solution:
The farm operator was looking for a high-performance storage system which could easily be integrated into the existing setup in order to absorb the hydraulic pumps’ initial peak loads. After that, the smaller base load could be covered by the existing sodium-ion batteries. He found the right solution with the off-grid-ready TS 48 V lithium-ion battery storage system manufactured by the German company TESVOLT. Miller Electrics installed the model, which offers 96 kWh (2 x 48 kWh units) energy content and a charging and discharging power of 36 kW.
• High-performing and fast
Thanks to the unique battery management system, TESVOLT’s storage systems make energy fully available. TESVOLT storage systems are 1 C- capable, meaning they can be complete ly charged or discharged within an hour with the proper configuration. And the charging speed of 1C means that even highperformance electrical equipment can be kept running.
The system boasts an aboveaverage service life of up to 30 years thanks to robust Samsung battery cells and one of the most advanced battery management systems on the market, which optimizes cells not only within a single module, but also between the modules in each cabinet.
90 % depth of discharge and only 3 W selfconsumption
seamless monitoring of storage system health down to the cell level
TESVOLT systems can be expanded or exchanged at any time – not just after the first few months of operation, but even many years later.
It wouldn’t be possible to run the installation without the TESVOLT storage system’s high performance. To ensure that the water pumps can start up quickly, fast charging and discharging were essential to us.
Mick Miller, Managing Director of Miller Electrics
The TESVOLT storage system was wonderfully integrated into my existing setup and is now working to absorb peak loads while the sodium-ion batteries cover the base load. But in reality, the TESVOLT storage system could take care of the whole job!
Torsten Ketelsen, owner of the farm