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Let’s face it, in an emergency your portable generator is only as good as the fuel it runs on. That’s where the great generator fuel debate comes in – should you go with gas or propane? When considering which fuel to use you should think about the following.
Availability
If there’s a regional disaster, earthquake, hurricane, etc, will the gas stations be able to pump gasoline? Remember the gas is stored in below ground tanks and the pumps require electricity to operate. Many stations have backup power for the pumps. However, gasoline delivery can also be impacted by the disaster. This type of situation occurred during hurricane Sandy.
There are many options, besides gas stations, for propane tank exchange. Major home improvement chains, local hardware stores, and garden centers all offer this service. So, when the power turns off the gas pumps you might still be able to get propane.
Winner: Propane
Run Time
Ideally, you do not want to constantly have to refuel your generator. Gasoline produces more BTUs per unit of fuel than propane. Therefore, gas generators will run about twice as long as propane for the same output level.
Winner: Gas
Storage and Stability
Some amount of gas can be stored in the generator itself. The rest needs to be stored in a gas can of some type. However, gas is highly flammable, so you do not want to store very much. Gas also has a relatively short shelf life of about 6-12 months. After that you need to dispose of the gas (which can be difficult) and restock.
Propane tanks come in many sizes. However, many people already have the standard 20 lbs tanks around the house for use in their BBQs, patio heaters, fire pits, etc. These tanks are stable and can last years if kept in proper conditions.
Winner: Propane
Cost
When considering cost we need to think about the up front cost of the generator and the cost to run it. Typically, gas generators cost less than propane – for the same output level. In addition, they usually cost less to run (this changes based on the cost of gas and propane). This is due to the fact that a propane generator will need to be refueled more often.
Finally, propane generators will typically not last as long a gas generators. This means you might need to replace your propane generator sooner than an equivalent gas model.
Winner: Gas
Environmental Impact
This will not be a concern for everyone. But if you are worried about the environment, then propane is your best option. It runs much cleaner that gas.
Winner: Propane
Still can’t decide? The good news is that you don’t have to. There are a number of excellent duel fuel generators on the market. These will allow you to use both gas and propane. You can have the best of both worlds!