Path-Q Solar
How should a generator comparison account for fuel storage during a long outage?
Answer
Compare each generator's expected fuel consumption, available storage, safe storage limits, refueling access, fuel shelf life, and resupply reliability over the longest credible outage. A generator's rated runtime is not meaningful unless the fuel supply and refueling plan support it.
Key points
- Estimate fuel use at the actual intended load, including startup events and variable loading.
- Model several outage durations and include fuel already on site, usable capacity, and reserve requirements.
- Evaluate whether the fuel type can be stored safely and whether it degrades or requires conditioning.
- Include delivery constraints, weather, security, ventilation, spill response, and manual refueling effort.
What it depends on
- Generator fuel type and load-dependent consumption
- Storage capacity and permitted location
- Expected outage duration and resupply availability
- Local safety, fire, environmental, and insurance requirements
Risks and trade-offs
- More on-site fuel improves autonomy but increases storage hazards, cost, and management.
- A smaller fuel supply may be adequate for short outages but fail during prolonged events.
- Fuel shortage, stale fuel, blocked deliveries, or unsafe refueling can eliminate the generator's practical benefit.
Information you may need
- Generator fuel-consumption curve
- Critical-load profile and outage scenarios
- Existing and proposed storage capacity
- Refueling and emergency-access plan
Your next step
What to do next
Build a load-based fuel plan for short, medium, and extended outages and have the proposed storage arrangement reviewed for safety and compliance.
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