Options for Backup Generators

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A genset unit is durable and long-lasting if it is maintained well. A good quality generator has no problem with run times but it should be maintained regularly.  For example, a diesel engine may need servicing at various hour intervals, such as 25, 250, 500 and 1,000 hours of operation. It is always advisable to purchase a genset with a running time meter; it is worth the extra cost to keep track of maintenance and operation..

As with all mechanical units, oil, fuel filters and air need periodic changes. You can do this yourself, with your model's service manual and the right spare parts, to cut down the servicing cost. You will need to have the right engine oil and tools to drain the engine crankcase and change the filters. Used engine oil can be dropped off at most garages for recycling instead of pouring it into the storm sewer or the ground – both of which can destroy vast amounts of ground water and badly damage the environment.

For easy startup in winter, fully synthetic oil is recommended for your genset operation.

Further Notes on Biodiesel Fuel

Great progress has been made in green diesel engines which are no longer slow, smelly or clunky. New technologies in common rail diesel engines have eradicated cold weather startup problems or the need for block heaters.

The diesel engine community may soon see an improvement in biodiesel fuel availability. Biodiesel fuel is manufactured through renewable soya, canola, waste grease, animal fats and other grains.

Biodiesel fuel is much greener than fossil fuel thanks to its lower carbon dioxide life-cycle and smog emissions. Biodiesel fuel may be a bit more costly but it is worth the extra for the genset to obtain a minimal run time in an off-grid system or an emergency backup system. There is a symbiotic relationship between this fuel and the renewable energy system which proves beneficial to all parties.

Renewable Energy Generators?

When you talk about renewable energy sources, many think of sun, water and wind; however liquid renewable energy like biodiesel can also fuel a generator which can even function as your only electrical power generation source.

A lot of systems use this method as it lowers the entry cost for those who cannot take on a full roof of PV panels. It is a simple concept for an off-grid system with a backup generator to start off by charging a battery bank without wind turbines or PV panels. When you have more finances, you can invest in PV, micro hydro or wind components to tie into the generator system. In due time, these added renewable sources will reduce the running time of the generators to lower the operating costs.

A small off-grid 12V system consuming 2 kWh per day needs a battery bank of 1,000 amp-hours capacity:

2,000 Wh/day + 12V = 167 Ah battery capacity per day

Assuming at least 3 days' difference between generator operations and battery discharge of 50% depth, you will reach the 1,000 Ah capacity requirements:

(167 Ah / day capacity required x 3