This pure sine wave inverter puts out pure power at a measured efficiency of 90% and will even handle loads above the rating (I think because they guarantee 1000W for 24 hours at "true rating” it will handle loads > 1000W in short periods which is a nice bonus). It worked with my 1500 watt microwave for at least a minute or two (I didn't try to press it as it caused the inverter fans to finally turn on). It worked on my fridges, toasters, computers/speakers, gas stove (basic) with no side effects. An additional note about using it in a gas oven, make sure you ground it to the wall outlet or oven chassis, as your oven may not turn on heat if it doesn't detect a proper ground. No buzz, no weird buzz, no slow speeds like the other one I bought and returned. I recently purchased a modified sine wave inverter (Power Bright PW1100 12) and was both concerned and disappointed. This would be very finicky when turning on fridges and other surge devices, it would make my oven fan sound really bad/slow like it's busted, and even make my computer monitor buzz. Also, the LCD monitor on the front of the modified inverter that showed watts/volts wasn't even accurate. I'm so glad I just went ahead and got this Wagan Pure Sine Inverter instead. I also looked at the Kisae SW1220 (pure sine, also 1000w), but it's $25 more and doesn't come with a battery cable, so the Wagan wins. I am definitely satisfied with my test. Now I feel like I could even build this up with a few solar panels and not be afraid I'll fry the electronics, motors etc in the long run like I was with the modified version of the sine wave I bought earlier . It's not much more considering how many of these new lights need to be replaced and it even behaved like a 1500w model for at least a few minutes (maybe I'll move it later) so I guess that it's worth the price premium for peace of mind and productivity (unlike before, I could now quickly heat up the microwave during a power outage). The only thing missing (but at this price point, it's hard to fault) is that there's no LCD monitor (but I'm happy to use the Kill-a-Watt, which I have anyway, for more info, and it turns out that the monitor my previous inverter was not even correct) and the ground stud is very small. I only used a couple of shims to increase and adjust mine, so it's not too big of a deal (I bought a special connector and attached an 8AWG wire and ring terminal to it). However the fact that it worked so well was very efficient, it has nice thick cables for connecting to the battery and has terminal covers for safety (and they are spaced far apart). It's very easy to overlook these two minor ailments. . (but in case the creators see this review, they might be working on the next one). As long as it doesn't add too much to the price for an accurate reading of input V/A/W (at least 2/3 to be able to calculate 3rd), output V/A/W etc. I think it does would be a nice addition (however, if it's more than the extra $25, it might not be worth it because the price is so nice). That ground stud really needs to be bigger. I've attached a picture of my power off kit (no battery of course). I separately bought an ANL fuse, kit and short super fat wire (it was a spartan kit), 8 AWG green wire and custom plug, seal connector covers and a random box.
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