Generator Winter Readiness in Ukraine: Cold Start at −25 °C

In Ukraine a standby generator often has to start in the coldest hours of the night, when the grid fails under peak load. At −25 °C a set that starts easily in October can fail on its first automatic start. This guide lists what a set needs for winter and a checklist to complete before the first frost. The general principles are in our article on running a generator in winter.

What Ukrainian specifications ask for

Tenders for hospitals, water utilities and municipal sites typically state:

• an operating range of −25 to +40 °C with automatic engine pre-heating;
• a canopy with internal exhaust;
• a fuel tank for at least 10 hours at 75% load;
• 400 V, 3-phase, 50 Hz, an ATS-ready controller with RS485;
• documentation in Ukrainian and English.

Equipment for −25 °C

Item	Purpose
Block heater (jacket water heater) with thermostat	Keeps the engine warm so it starts first time and accepts load quickly
Battery sized for cold cranking, automatic charger	The battery delivers less current in the cold while the engine needs more
Antifreeze mixed for the lowest site temperature	Prevents freezing of the cooling system
Winter diesel fuel	Prevents wax gelling in filters and lines
Oil of the right viscosity	Keeps the oil fluid at start
Canopy with closed louvres and internal exhaust	Limits cold air and snow ingress
Controller display heater where needed	Some controller displays are rated only to −20 °C

Fuel and oil

Fuel bought in summer can stay in the tank until the first frost. Before winter, replace it or blend it with winter grade fuel, drain water from the tank and separator and change the fuel filter. For oil, follow the engine maker’s viscosity table for the lowest expected temperature.

Pre-winter checklist

1. Check that the block heater works and holds the coolant warm.
2. Load-test the battery and check the charger.
3. Measure the freezing point of the coolant.
4. Replace fuel and oil filters; drain water from the fuel system.
5. Check the canopy seals, louvres and the exhaust outlet for snow ingress.
6. Run the set on load for at least 30 minutes and test the ATS transfer.
7. Keep spare filters and a battery charger on site.

Next step

Our sets for Ukraine are built in Tuzla, Istanbul, load-tested before shipment and supplied with a block heater and documents in Ukrainian and English. Send us your load and site temperature and we will prepare an offer: contact us.