I'd be willing to bet there was a difference in the usage or setup of the laptop between her two tests..
That guess would be incorrect.
I typically never run my comp inverted, only charge it inverted. (I have run in inverted in a "Must do" situation, but those are rare and pretty untypical.. and usually in a running car when I desperately need a map...)
A laptop OFF does nothing current draw wise, other than charging the battery
. If I was charging the battery
at full depletion vs. one at 95% down, and then coming up with my conclusion, your guess would be correct, however, I typically run down to 45% then charge. So, ... like charge vs. like charge.. running off the same group 24 battery within hours of each other, and showing the same differences consistently afterwards, seems pretty equal to me.
Also, as previously mentioned, the same variances are shown between many sized inverters.. not just the 400 vs. the 100. That eliminates the 400 as the root cause.
Since I installed and actually prefer my LEDs for lighting
, I really have no use for inversion other than the laptop. I carry all this fodder "just in case" and have only used them since for infrequent and short use of power tools and small musical instrument amplifiers.. (Which are as a rule.. are not allowed when I camp.. but some of my friends just can't live without for a day... arrgh!)