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Sizing the Generator
Systems Overview
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Typical Back-up Generator Configuration
Generator is sized to power the emergency loads.
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Likely Health Center Load Profile
What size Generator do we need?
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Sizing the Generator
• In general, a generator must be sized to handle the largest EXPECTED load, with a margin of safety. (recommended 25%)
• In the above case, you would want a generator capable of producing 8 KW x 1.25 = 10 KW.
• This means for that for the majority of the time, the generator will be less than 1/3 loaded. This is not unusual.
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Generator Alone Sizing Result
Energy Needed
Excess Energy Made Available (costs in added fuel)
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Power for Inverter / Batteries
Generator is sized to power the lab loads plus the battery charging loads.
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Charging the Batteries
From SW Owner’s Manual
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Generator Run Time with Batteries
Revised Operating Time of Generator
Actual Load remains the same
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Generator Fuel Consumption
• This fully loaded 30 KW generator consumes approx. 10 l/hr of fuel.
• When 25% loaded, (which is normal loading for a generator-only installation), the generator consumes 40% of the full load fuel.
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Generator Fuel Consumption
• If we can keep a generator loaded closer to its full load rating:
– The fuel consumption / kwhr will be much better
– Efficiency will be better (see curve.)– Maintenance will be better. (talk to Mfr.)
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The rising cost of Fuel
Inverter / Battery systems, coupled with the generator can save 50% of the operating costs over the long term.
From Powering Health – Haiti Assessment