Will this run an O2 concentrator,fridge,tv, and cable box?

The fridge and TV are going to be your 2 biggest power hogs. There is a work-around for this. A good fridge will hold a safe temperature for up to 24 hours with no power. With that in mind, stagger the use of these appliances. Obviously the O2 concentrator is a must. Leave it on 100% of the time. But only run the fridge long enough to get its temperature back down (4-6 hours depending on how high the starting temp is). Once the fridge is back to normal operating temperature, unplug it and plug in your TV. I would hate for you to be constantly tripping the circuit breaker protection, or worse, burn up your generator. It's just one of those things where you're better off being safe than sorry. For making sure that your food stays safe, it is extremely important that you open the door as little as possible. Also, you really should invest in a low cost thermometer to keep in the fridge at all times. Place it somewhere easy to see so you just have to crack the door open a little bit to see your current temp. You should have no problems if you do things this way. It has worked for me for years. P.S. A full fridge will hold temperature much longer than a sparsely packed fridge. I recently went 3 days without electricity or the means to run my generator and my fridge and freezers all remained in the saft zone. These results are not typical.

The LP3250 portable generator is rated for a continuous output of 3,250 watts, with a rated amperage of 27 amps at 120 volts, or 13.5 amps at 240 volts. You will want to ensure that all of the items you intend to run will not exceed this rating. New appliances or sensitive electronics with electronic control boards, such new power tools, refrigerators, furnaces, and televisions, can require total harmonic distortion to be below 5%; the total harmonic distortion for the LP Series portable units will be above 5%. If you are unsure of whether or not the items you intend to run are a sensitive item, we recommend to contact the manufacturer to determine any specifications or restrictions for use with a portable generator. If you are looking for a unit with a cleaner power output, we would recommend considering either our XP Series gasoline powered units or our Guardian series automatic home standby generators.