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Solar and Battery System for Dairy Farms
How a 150 kW Solar and Battery System Transformed a Modern Dairy Farm
Powering Modern Dairy Farming With a 150 kW Solar and Battery System
Dairy farming is energy intensive. Milking equipment, vacuum pumps, milk cooling, hot water production, lighting, and sometimes irrigation all place heavy, daily demands on electricity. When grid power is unreliable or tariffs keep rising, these essential loads turn into a major risk for the farm’s productivity and profitability.
This case study looks at how a 150 kW solar and battery system transformed a working dairy farm’s energy profile. Instead of being at the mercy of the grid, the farm now uses clean, self-generated power for most of its operations and relies on storage to bridge early-morning and evening peaks.
The Energy Challenge on Dairy Farms
Unlike some other types of farming, dairy operations run to the rhythm of the cows and the milk market, not the grid. Most farms have two main milking sessions per day, typically early in the morning and late afternoon, and both windows require a lot of power in a short space of time.
Key energy challenges dairy producers face include:
High electricity consumption from milking machines, vacuum pumps, compressors, refrigeration, and water heating.
Peaks that occur partly outside the middle of the day, when solar production is naturally highest.
Exposure to grid failures and load shedding, which can disrupt milking, compromise animal welfare, and risk milk quality if cooling is interrupted.
In many regions, dairy farms also face time‑of‑use tariffs, meaning power is more expensive at exactly the times it is most needed, such as mornings and evenings. This combination of high, time‑sensitive demand and unreliable supply is what made this farm look seriously at solar and storage.
Battery System explained
The battery storage system is integrated via a hybrid or AC‑coupled configuration, allowing:
Batteries to be charged with surplus solar during the day.
Stored energy to power early‑morning and evening milking when solar alone is not enough.
Seamless switchover during grid failures, keeping essential loads online.
Critical loads, such as milking parlour equipment, milk cooling, and key pumps, are wired to priority circuits so they remain powered even if grid supply is interrupted.
Installation and Commissioning
On a working dairy farm, installation cannot disrupt milking schedules or animal routines. The project was therefore carefully planned in phases:
Site preparation and mounting
Roof structures were inspected and reinforced where necessary, and ground‑mount frames were installed in an area with minimal shading and easy access for maintenance.Panel and inverter installation
The 150 kW array was installed in blocks, with inverters positioned for optimal cable runs and cooling. Work was scheduled to avoid the busiest farm periods.Battery integration and controls
The battery bank was installed in a secure, ventilated area with proper fire and safety measures. The control system was configured to prioritise self-consumption, manage charging, and provide backup across the farm’s essential circuits.Testing and optimisation
Once commissioned, the system was tested under real farm conditions. Monitoring data in the first weeks was used to fine-tune settings such as battery depth-of-discharge limits, backup priorities, and tariff-based charging rules
Results: Lower Bills, Reliable Power, and Happier Cows
After the solar and battery system had been running for several months, the farm started seeing clear, measurable benefits. Other dairy case studies show similar installations can cut grid electricity costs by around two‑thirds and significantly decrease or even eliminate fuel use for backup generators.
Key outcomes from this 150 kW project include:
Substantial reduction in grid electricity consumption. Daytime operations are largely powered by solar, with the battery covering the gap at peak times.
Greater energy resilience. Milking, cooling, and essential farm loads continue even during grid outages, reducing production losses and stress for both staff and animals.
More predictable operating costs. Instead of being fully exposed to rising tariffs, the farm now has a reliable base of self-generated power, making long‑term planning easier.
Lower environmental footprint. By replacing a large share of grid and diesel consumption with clean energy, the farm reduces its emissions and can use this in its marketing and supply-chain reporting.
In some documented dairy projects, farms have also been able to reconfigure heating systems to run on solar‑powered heat pumps, further cutting fossil fuel use and improving efficiency.
Operational Changes on the Farm
Technology alone does not deliver the full benefit; small operational adjustments can unlock even more value. On this farm, the new energy system encouraged a few changes:
Shifting non‑critical tasks, such as certain pumping and cleaning operations, into the middle of the day when solar is strongest.
Monitoring energy use more closely and identifying wasteful equipment or processes.
Training staff to understand how the system works and what to do during outages or unusual conditions.
By aligning more activities with solar production and using batteries intelligently, the farm extracts maximum value from the 150 kW system without compromising animal care or milk quality.
Financial Performance and Payback
While every project is different, the economics of solar on dairy farms are often compelling when modelled over the life of the system. The main financial drivers are:
High daytime consumption, which solar can directly offset.
Rising electricity tariffs and, in some regions, expensive peak or time‑of‑use rates.
The ability to reduce or eliminate diesel generator use, which carries both fuel and maintenance costs.
Studies of dairy farms using solar and storage show that payback periods can fall in a competitive range, especially where grid power is costly and reliability is a concern. Once the system has paid for itself, the farm benefits from many more years of relatively low operating costs while the PV system continues to generate power.
In this case, the financial model considered:
The capital cost of the PV, batteries, and balance of system.
Energy savings over time, based on realistic yield and tariff escalation.
Maintenance and monitoring costs.
Potential tax and depreciation benefits where applicable.
The result is a strong long‑term return on investment alongside significant non‑financial benefits such as resilience and sustainability credentials.
Lessons for Other Farms
This 150 kW solar and battery case highlights several lessons for other dairy operations considering a similar step:
Know your load profile. Detailed energy data is essential to sizing both PV and batteries correctly and ensuring solar production matches your real demand.
Prioritise critical loads. Design the system so that milking, cooling, and essential pumps stay online even when the grid fails.
Think beyond panel count. Storage, controls, and the way the system is integrated into your operations matter as much as total kW.
Plan for growth. Leave room for future expansion if you expect the herd size or processing capacity to increase.
For many dairy farms, the move to solar and storage is no longer just about being “green.” It is a practical, financially sound way to secure energy, protect production, and build a more resilient business in an uncertain power environment.
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