Frequently Asked Questions
How much fuel does a generator burn per hour?
It depends on load. A 3 kW gasoline genset burns about 0.2 to 0.4 gal/h (0.8 to 1.5 L/h) at 75 percent load. Diesel is more efficient: a 5 kW diesel burns roughly 0.25 to 0.30 gal/h (1.0 to 1.2 L/h) at 75 percent. Check the manufacturer fuel curve for exact numbers.
When is a generator cheaper than adding more batteries?
A generator is cheaper short-term for rare peak loads or long bad-weather stretches. For everyday autonomy of more than 2 to 3 days, adding battery capacity is usually cheaper mid-term than the accumulated fuel cost plus oil changes and engine wear.
How do I cut generator operating cost in a hybrid solar system?
Only run the generator when battery state of charge drops below 30 to 40 percent, use full available output to bulk-charge while powering loads, and size loads to keep it above 50 percent rated, where efficiency peaks and engine wear stays low.
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