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I have a 10 kVA generator and its efficiency is approx. 90%.
That's impossible. No internal combustion engine can achieve that. The maximum theoretical value is 75%. (See Wikipedia.
For a small generator you'd be lucky to get 40%.
The 90% may refer to the alternator efficiency and this is in the realms of possibility (as is the likelihood that this number was advertised to mislead the buyer).
How can I know the cost of a kWh? Estimate the price of diesel as $2.5 a liter.
Assuming a resistive load so that 10 kVA = 10 kW1 then the mechanical input will be given by $$ \frac {P_{out}}{e_{alt} \times e_{eng}} = \frac{10} {0.9 \times 0.4} = 28 \ \text {kW} $$
Diesel has an energy density close to 10 kWh/L so you will need 2.8 L/hour for 10 kW output.
2.8 L × $2.5 = $7 for 10 kWh.
1 kWh = $7 / 10 = $0.70.
You will get efficient and thoughtful service from dingbo.
1 Most generators are designed to run at a power factor less than unity - maybe 0.8 or so. As a result further derating may be required in your use case.
With the seemingly inevitable long term increases in electricity prices affecting all of us, you may be tempted to consider generating your own electricity. After all, many farms and other businesses probably already have a back-up generation system to provide electricity during blackout periods.
Even though you may think that the charges for electricity from your utility company are outrageous at times, do not even consider the possibility of "pulling the plug" on your utility company and generating all the electricity you need for your farming operation. There is no way that you can generate electricity as cheaply or as dependably as your utility company! This statement is true for those who have their own on-site generation equipment as well as those who rent a generation unit.
When you calculate your costs to operate an on-site generation system, you must take into account the following factors:
The amount of diesel fuel required for generation is one gallon of fuel for each 11-13 kWh of electricity generated. For a fuel price of $4.00 per gallon, the corresponding cost of the electricity you would be generating is 30 - 37 cents per kWh. And that is just considering the fuel expense! When you consider all the other expenses involved, the cost of the electricity you would be generating on site is well over 25 cents per kWh. That is much higher than any projected prices of electricity after the rate caps expire.
The price of fuel varies considerably based on volatility in market prices and also the quantity purchased at one time. The cheapest price for both the fuel and the delivery of the fuel is when a full tanker load (approximately 7,000 to 8,000 gallons) is purchased at one time.
Therefore, adequate on-farm storage of 10,000 to 20,000 gallons is necessary for most economical operation of the generation system that is planned for heavy usage. Also, bear in mind that your stand-by generation system is most likely designed for short-term, sporadic usage rather than heavy usage. If you want heavy usage, then you need to purchase a heavy-duty generator system, designed for continuous usage.
It might be best to buy electricity from the utility company when you can and generate yourself whenever necessary during blackout periods. An exception is for the situation when you may want to use the generation equipment for "peak shaving" during the hot, afternoon hours in the summer when you are likely to set your peak demand. Just a modest reduction in your peak demand during a summer month can have a significant impact on the price you will pay for all of your electricity used that month and possibly for the next several months as well. Also, keep in mind that a solar photovoltaic system may be a cost effective strategy for reducing or eliminating your annual electricity costs.
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