Quote:
Originally Posted by map
.... when we were getting quotes for the standby generator one guy said we should get an additional tank. We currently have 2 / 100 gallon tanks for our heat......
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A 100 gallon tank for a standby generator? Maybe in summer. Talk to your propane supplier about the correct size of propane tank for fueling a generator. It's more than just how many hours of run time you want during a power outage. A generator of a given size (KW) needs fuel at a certain rate to run at full capacity. As I mentioned earlier in this thread (#33), liquid propane is vaporized using heat absorbed from its surroundings, presumably air around an above-ground tank. Rate of vaporization is proportional to surface area for heat transfer and to temperature difference across the tank wall. When air temperature drops, the temperature of the propane in the tank (and the pressure) must also drop to provide the required temperature difference. At some very low outside temperature, the pressure of the propane boiling inside the tank drops to a point just barely adequate to move propane vapor to the generator.
The supplier should have tables that will give vaporization rate required for a given generator size and rate sustainable at some minimum air temperature for a given tank size. That sets tank size needed.