BESS against blackouts:
Energy independence for Ukrainian business
Since 2022, Ukrainian business lives under the constant threat of blackouts. Massive attacks on energy infrastructure, generation shortages, and aging grids create a situation where power outages are not a matter of "if," but a matter of "when." BESS (Battery Energy Storage System) offers a fundamentally different approach to backup power compared to diesel generators: instant switching, zero fuel costs and decades of trouble-free operation.
Energy reality of Ukraine: 2022-2025
Systematic missile and drone strikes on energy infrastructure facilities in Ukraine in October 2022 created an unprecedented energy supply crisis. Understanding the scale of the problem helps to appreciate the importance of autonomous energy supply for business.
October 2022 — The first wave
The beginning of massive strikes on the energy infrastructure. 30-40% of generating capacities were destroyed. Outage schedules across the country are 4-12 hours a day.
Winter 2022-2023 is a critical period
Power deficit up to 30%. Emergency shutdowns without warning. Enterprises lost up to 40% of working time. Mass procurement of DSU.
Summer-Autumn 2023 — Restoration and new strikes
Partial restoration of capacities. New attacks on TPP and TPP. Introduction of scheduled outage schedules during peak hours.
Winter 2023-2024 — Repeated crisis
More than 50% of heat generation was destroyed. Record deficit of 4-6 GW. Outages of 6-18 hours a day in some regions.
2024-2025 — New normality
Business is adapting to the "new normal". The demand for autonomous power systems is growing. BESS becomes a strategic asset, not a luxury.
BESS vs Diesel Generator: Full Comparison
The diesel generator was the first response of the business to the crisis. But after 2-3 years of operation, companies are increasingly looking for an alternative. That's why.
| Parameter | BESS (LiFePO4) | Diesel generator |
|---|---|---|
| Switch time | 20 ms (UPS-grade) | 10-30 seconds |
| Fuel costs | $0 | $0.30-0.80/kW*h |
| Service | Minimal (monitoring) | Oil, filters, repair every 250 mg |
| Noise level | <50 dB (quieter than conversation) | 80-100 dB |
| CO2 emissions | Zero | 2.7 kg CO2/liter |
| Resource | 15-20 years / 6000+ cycles | 10,000-20,000 engine hours |
| Black Start | yes (instant) | Requires starter battery |
| Operation at -20°C | Yes (Heated) | Yes (Heated) |
| Scaling | Modular (multiple of 50 kWh) | Only replacement for a larger one |
| Additional functions | Peak shaving, arbitration, PFC | Only generation |
20 milliseconds - why it's critical
Home the advantage of BESS over a diesel generator is the switching time. 20 milliseconds is UPS-grade response, invisible to any hardware. For comparison: a diesel generator needs 10-30 seconds to enter the operating mode (start-up, warm-up, synchronization). What happens in those 10-30 seconds:
IT infrastructure
Servers reboot, databases can be damaged. Recovery time — from 15 minutes to hours. Loss of data in transactions.
CNC machines
The processing program is reset. The workpiece is damaged. Machine calibration — 30-60 minutes. The spindle may jam.
Refrigeration chambers
The compressor stops. When restarting, the starting current is 5-7x. Risk of damage to the compressor with frequent cycles.
Conveyor production
Complete stop of the line. Lack of products in the processing area. Restart time — 30-120 min depending on the process.
"For one blackout without UPS switching, we lost an order worth UAH 450,000 - workpieces on CNC machines were damaged, and the server of the ERP system needed 4 hours to restore. After installing BESS at 300 kWh, we do not feel any outages at all." — Production director, machine-building plant, Dnipro
Black Start: Start of zero
Black Start is the ability of the system to start up after a complete power outage, without an external network. BESS of grid-forming inverter (for example, Deye SUN-50K-SG04LP3) forms a "virtual network" — sets a frequency of 50 Hz and a voltage of 380 V, creating a stable power supply for the entire facility.
A diesel generator can also perform a Black Start, but requires a working starter battery, warm-up (1-3 min), and often manual start. BESS does this automatically in 20ms, without staff intervention, day or night, at any time years.
The cost of an hour of downtime by industry
When BESS and when Diesel?
BESS does not always replace the generator - often they work together in a hybrid scheme. Here are the recommendations:
BESS as a single backup (no generator)
- Outage up to 4-8 hours
- Load up to 200 kW
- Critical equipment (servers, CNC, medical)
- Urban location (noise, emissions are unacceptable)
- Additional functions are required (peak shaving, arbitration)
BESS + Diesel (hybrid)
- Outage 8-24 hours or more
- The load is more than 200 kW
- Production of continuous cycle
- Remote facilities with no network recovery forecast
- BESS provides UPS switching, the generator provides long-term autonomy
Real case: Logistics center, Kyiv region.
Challenge & Problem Statement
- Logistics hub 3000 m2 of cold storage (-18°C)
- Load: 150 kW (compressors, lighting, IT)
- Shutdown: 6-12 hours a day (winter 2023-2024)
- Cummins 200 kVA generator: costs UAH 5,000/day for fuel
- At each switchover: start shock of compressors, failures of the WMS system
Solutions
- BESS: 600 kWh / 200 kW (CATL EnerOne + Deye inverters)
- Mode: UPS (instant switching) + Cycle Charging of the generator
- The generator only works to recharge the BESS at 80-100% capacity
Result
- Zero power outages — compressors run continuously
- The generator works for 2-3 hours instead of 10-12
- Fuel savings: 75% (from 5000 to 1200 UAH/day)
- WMS system does not freeze - zero lost orders
- Payback Period: 18 months
Cost comparison: BESS vs Diesel (10 years, UAH)
* TCO for 10 years: Diesel — ~21.2 M UAH, BESS — ~2.55 M UAH. The difference is 8x.
Frequently Asked Questions
For how many hours will BESS last in a complete blackout?
Can BESS replace UPS for server room?
What if the blackout is longer than the BESS supply?
Is it safe to install BESS indoors?
How much does BESS cost for backup power?
How does BESS work in sub-zero winter?
Suffering from blackouts?
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