For an elevator, farm, or vegetable storage facility, a power outage means more than just downtime. Ventilation, cooling, milking, or grain intake stops, and the consequences sometimes only become apparent after the power returns. A diesel generator still remains the baseline solution, but more and more companies are evaluating BESS systems for business as a supplement or partial replacement. The right answer depends on which processes need to be protected and how many hours they must operate without the grid.
What determines switching speed
The main difference between the two sources becomes apparent in the very first minute. A generator typically needs seconds to start and accept the load. For many mechanisms this is acceptable. For controllers, control systems, frequency converters, or automated lines, such a pause can mean an emergency shutdown and restart.
Storage systems switch significantly faster. The head of one of Ukraine's energy companies, in an interview with Focus, cited 10-20 milliseconds for industrial installations. The actual result depends on the configuration and automation, so this parameter should be specified in the technical requirements and verified during commissioning of the facility.
At an agricultural enterprise, it is advisable to first divide consumers into groups. The first covers processes where even a short interruption is undesirable: automation, refrigeration controllers, ventilation in a poultry house, dairy equipment. The second includes loads that can wait a minute or two. The third includes equipment that can simply not be started at all when the grid is absent. Without such a division, the system ends up either too large or fails to cover critical tasks.
Where the generator retains its advantage
Runtime remains the strong point of diesel. It will run as long as there is fuel and the engine is in working order, whereas typical industrial storage systems are designed for approximately several hours of discharge. Therefore, for a facility that must withstand multi-day blackouts without a solar station, abandoning the generator would hardly be justified.
Another argument concerns starting currents. Grain conveyors, active ventilation fans, and compressors during startup create loads that significantly exceed the operating load. The storage system's inverter capacity must be selected for such modes, and soft starting should be provided if necessary.
At the same time, the generator has costs that often do not make it into the initial calculation: fuel and its storage, seasonal logistics, scheduled maintenance, noise, emissions, operation at low load. At facilities where the backup is switched on frequently and for several hours, these items gradually shift the comparison in favor of batteries. Where outages are rare, the short runtime will not always justify the higher capital costs.
Why the common scheme combines both sources
For some enterprises, the choice between BESS and a generator turns out to be conditional. The storage system handles instantaneous switching and short outages, while the diesel is switched on only during prolonged blackouts. This can reduce the number of engine operating hours. This was precisely the goal cited by the chief power engineer of the Agro-Region group when he spoke about plans to add battery blocks to the company's solar stations.
It is worth considering that a storage installation does not itself generate electricity. Ekonomichna Pravda points this out directly in its material on preparing business for winter: without its own generation, an enterprise remains dependent on the grid. A solar station changes this logic, because during the day it can cover part of the needs and charge the batteries. In winter its contribution will be smaller, so the backup scenario for the short-day season should be calculated separately.
Agricultural companies are already moving toward their own generation. According to Mind, Kernel launched pilot solar stations with a total capacity of 250 kW at elevators in Kirovohrad and Poltava regions and expects payback within five years. This is the company's own estimate for its facilities, so it should not be automatically transferred to other enterprises.
How to calculate the requirement
The basic estimate starts with two numbers: the capacity of critical consumers and the time they must operate without the grid. For example, 200 kW for three hours gives 600 kWh of useful energy. The nominal battery capacity must be larger given the permissible depth of discharge, losses, and an allowance for aging. The exact figure must be obtained from measurement results.
An hourly consumption profile is more important than the nameplate capacity of the equipment. An elevator during harvest and in winter, a farm in summer during peak ventilation, a storage facility throughout the year have different profiles. Measurements should be taken during periods of real load or use meter data for the season.
Also, at the design stage, the site must be checked: temperature conditions for the batteries, fire safety requirements, space for a container or cabinet, connection to existing automation and the generator. For remote facilities, it is equally important to agree in advance on remote monitoring and service response times.
Financing and project economics
The payback of a backup system is not limited to fuel savings. The calculation should include the cost of downtime, spoiled products, line stoppages, and, if a solar power plant is present and suitable tariff conditions exist, also the effect of using stored energy during expensive hours. If these indicators are not measured, comparing options solely by equipment price is uninformative.
For farmers, the issue of capital costs is partially eased by bank programs. As Latifundist reported, ProCredit Bank expanded its partner network for financing solar power plants and storage installations, including for elevators, farms, and processing enterprises. The list of partners names a number of market companies, including Unisolar. Current rates and requirements should be confirmed directly with the bank.
Therefore, BESS is particularly appropriate where the interruption itself is costly and outages recur frequently and last relatively short. The generator retains its place during prolonged blackouts. For many agricultural enterprises, a practical solution will be their combination, calculated for a specific production cycle.