otrfun wrote:
theoldwizard1 wrote:
On refrigeration equipment you might find "locked rotor amperage" (LRA) which would be worse than normal inrush current.
Sorry, have to respectfully disagree. One cannot be any "worse" or better than the other since they both, more or less, describe the same thing.
Air conditioner manufacturers use LRA to quantify the inrush current drawn by the compressor motor at its rated voltage when the rotor is kept stationary. Or, put another way, LRA quantifies the inrush current necessary to place a stationary or locked rotor in a compressor motor in motion.
theoldwizard1 wrote:
No manufacturer specs their in rush current.
Agree, it's not very common for manufacturers to use the term inrush current when providing specs for their products. The primary reason is because inrush current is a general descriptor for a short, momentary burst (or inrush) of current. The time/duration for measuring inrush current can vary for RV a/c compressors and small household motors as opposed to large commercial equipment.
Inrush current, in terms of starting RV a/c compressors and smaller consumer-type AC motors, is typically measured in less than a second. A Fluke or Amprobe inrush current capable clamp-on ammeter bears this out because it provides inrush current results in less than second. The time/duration for the inrush current analysis is less than a second, but obviously much longer than what's required for a peak reading.
With that being said . . . if an inverter or inverter generator manufacturer specifies current and time/duration at multiple power levels, one can use this data to approximate inrush current performance. For example, a 2000 watt inverter (with a 2000 watt "continuous" power rating) that also has a 4000 watt *peak* power rating will probably provide minimal inrush current. A 2000 watt inverter that can also output 4000 watts for 1-2 seconds should provide excellent inrush current. A 2000 watt inverter that is capable of producing 4000 watts for 5-10 seconds (and/or 6000 watts for 1-2 seconds) should provide outstanding inrush current.
Hope this helps.
ok so here are the specs. once again renogy customer service was quick and efficient. so there is two specs one for max power (4000watts) and one for overload protection. so it will handle the max power (4000watts) for 5 seconds and if it hits a overload conditions that will trip the inverter to protect it with in 40milli seconds.
