What does "other generators" mean? Are you looking at just the generator or are you looking at a packaged set with both prime mover and generator? Just rotating generators or does PV count?
Starting time might be the only answer at this point, the package has to be able to carry full load within 10 seconds of receiving the start command.
I’ll see your silver lining and raise you two black clouds. - Protection Operations
Diesel generators intended for prime power often have additional accessories to enable extended run time. An example would be larger oil reservoirs and fuel tanks.
In my state, the emissions requirements are less stringent for emergency generators than for prime power generators(tier 2 versus tier 4).
Specific definition and requirements in NEC Article 700 for a legally-required emergency generator. You'll also need to review other applicable NFPA standards related to emergency power. Pro-tip - don't use the term "emergency generator" unless it is truly a legally-required emergency power system.
At one time the main difference was in the ratings and accessories.
Typically the same set will be rated 12% higher for standby than for prime power.
The prime power set may have enhancements such as a larger oil sump or an oil cooler or possibly a larger radiator. (Though many standby sets also have oil coolers.)
A standby set gets old with very few running hours.
Standby sets are pushed to the maximum output.
Prime power sets are typically derated so that after 10,000 or 20,000 hours, they will still be capable of delivering rated output.
Admittedly my information is dated as I started to get heavily involved with standby sets about 20 years ago.
I did a lot of research on gen-sets.
I compared engine model numbers and generator end model numbers between standby and prime power sets.
The same basic engine and generator end would be used for a standby set at one KVA rating with a Catalogue number roughly indicating the KVA capacity and on another prime power set with a different Catalogue number and capacity of 25% less.
Eg: standby rating, 100 KVA, Prime power rating of the same basic set, 80 KVA.
-------------------- Ohm's law
Not just a good idea; It's the LAW!
