Would a smaller inverter last longer?

Modern electronics should be fine especially anything with an external power supply or a PC tower with an Interchangeable PSU as modern PSUs are capable of delivering consistent power to the more sensitive components than they were years ago now say you have e a Xbox original with an internal power board that your average user could not replace it is older tech and more prone to poorer power delivery and would be difficult to repair that I could see being concerned about.
I had a laptop I ran off a 40 dollar inverter for over a year until I forgot to secure it and screen cracked was not worth replacing screen never had any issues with the laptops power brick or stability of the system and this was with modified cooling fan via drimmel tool alterations to chassis and them overclocking the HP laptop via a hacked firmware update to the bios.

Tldr modern electronic that use a power brick or internal power board should be fine

 

Well I know you got dual graphics and I would venture to say they are AMD

 

Intel 6700k overclocked to 5.2ghz on water cooling
Dual AMD r9 290x both on water cooling
Asus rampage v extreme
And 32gb of Corsair dominator ddr4
All powered by a Corsair ax1500i
Feeds 3 23 inch Asus thin bezel monitors. The entire rig with three monitors pulls around 1400 watts on my killawatt. But I usually run my monitors on a different circuit just to save on the amperage pull on the breaker.

 

Yes I know I'm behind on the times with my video cards. Just don't see much need to upgrade since my cards handle everything I can throw at it on ultra. When I am home i might throw down on some battlefield 4, or go back and play some call of duty

 

Nice rig mine is a bit more conservative g3258 of 4.2ghz
8gb gskill ddr3
2tb sshd
GeForce 760ti
B85M DS3H motherboard
Win7 ultimate edition
Cost me around $500 about 2 years old run most games 1080p max setting no AA some games that really want a quad it struggles with but it's great for what I play on it mostly

 

Ya I wouldn't see any reason to upgrade dual 290x either at least until they either can't keep up or driver support is dropped Wich should be a little while longer still

 

Even then AMD drivers tend to work cross platform till they completely change architecture

 

Yep sometimes you get crazy things with dual graphics though and got to set a game to use only one card until a driver update

 

Lets just make sure we get a large enough inverter ok?