Is your generator ready for winter?
November 1st 2007

Every generator should be covered by a rapid response service contract. However, rather than let an emergency arise there are some basic checks that can be taken which can go a long way to ensuring that in the depths of winter your generator will always start thereby guaranteeing a reliable source of emergency power says Lorraine John, service manager – Merlin Power Management

In this article I will be looking at some of the common causes of generator failure and the checks that can be carried out to help ensure your generator always starts, first time, every time.

The battery

One of the most common causes of generator failure is a faulty or discharged battery. The only power source to start the generator in an emergency, the battery should always be treated with care and respect. When the mains supply is connected, the battery is kept fully charged through a dedicated charger. The first thing to check is whether the charger is working? Ensure the indicators/meters on the generator control panel are functioning and test the condition and tightness of the battery terminals.

Despite their appearance, batteries are surprisingly fragile and should be treated with care. Keep the battery clean, wipe it with a soft dry cloth to remove any dirt/grease, particularly from the top. This will help prevent tracking and selfdischarge.

Rough handling can damage the case and cracking can occur, which can allow the electrolyte to escape. This will not only shorten the life of the battery but also, in extreme cases, can result in external short circuits, which can be a fire hazard.

Emergency stop button

All generators are fitted with an external Emergency Stop Button ('the red mushroom').

These get pressed by accident and as the name implies they will either stop the generator, if it is running, or prevent it starting.

Check the control panel for any alarms or indications that the button has been pushed, if necessary reset the panel and the button.

Fuel contamination

Another common problem that causes starting and running problems is fuel contamination. This can take a number of forms but the most common is water.

Check the fuel system and any external bulk storage tank for likely access points.

In particular pay attention to laying water, exposed pipework, gauges etc. Diesel fuel that lays dormant in a storage tank for long periods can be contaminated by water and can get infected by a form of bacteria. Over time this can create a 'sludge' that settles in the bottom of the tank. This blocks or restricts fuel pipes and can prevent generator starting. Removal should be undertaken by a specialist external filtering system.

Exhaust cap

Water can collect inside the engine through a faulty exhaust rain cap. Ensure the cap opens and closes freely without obstruction.

Regular testing

Regular starting and testing of the set will help identify potential problems before they become serious reliability issues. A remote monitoring and diagnosis system, such as Merlin's Hawkeye, will carry out this task automatically, continually monitoring and starting the genset once a week to check its operation (including the fuel levels and the emergency stop button), then report the results back to a central control HQ.

Service and maintenance companies like Merlin Power Management should always be employed to carry out regular maintenance checks on all generators and to respond in the event of a generator failure. However by undertaking these basic checks before the worst of the winter weather arrives you may well prevent disruption to your business should powercuts occur.

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