PLEASE NOTE: If you had an account with the previous forum, it has been ported to the new Genetry website!
You will need to reset the password to access the new forum. Click Log In → Forgot Password → enter your username or forum email address → click Email Reset Link.
On 6/13/2021 at 11:19 PM, The Blind Wolf said:Enough serge to get your jollies off. I mean to be able to start a AC with 77A start up while running other stuff. that's crazy. I bet his battery screams when it does that though.
For the surge load, that is probably mostly down to the capacitors and the inductive properties of the big transformer in the GS inverter for the instantaneous load. That gives the battery enough time to react to the sag in voltage.
That being said, if Sean had access to an oscilloscope current clamp probe it would be possible to take single shot tests and display the overall current being drawn in the first fractions of a second and even see how much if any ringing is present when the load starts. That measurement is often not caught by regular clamp meters because they are not fast enough. Some electric motors can surge over 7 times the running current to start but that surge may only be a fraction of a millisecond. It would be interesting to see where the upper limit actually is on an unlocked GS inverter since you could then set a locked GS inverter at 1/4 to 1/3 that limit and know that you have plenty of surge capability without getting anywhere near the danger zone. If I had to guess knowing that I have personally pulled over 4000 watts at 120v through the primary of a MOT with a custom wound secondary with a 1 second impulse. I would guess that the transformer and FETs in a GS inverter could safely handle a 20-25KW surge for a fraction of a second without issue but it is nice to see what it can do in a real world test. Not that anyone should be pushing equipment beyond its rated 100% duty cycle. Some day I need to buy a better bench scope and do some of my own tests on some of the household loads I have around so I can provide some more data to the community.
That being said, if Sean had access to an oscilloscope current clamp probe it would be possible to take single shot tests and display the overall current being drawn in the first fractions of a second and even see how much if any ringing is present when the load starts.
Very good idea. We can actually "borrow" a standard large-size PJ current transformer, and put it over the battery cable to a GS inverter...it'll give an AC representation of the current (no DC component), but I have calculated/figured out the scale on that, and it might be quite informative.