What is the wattage draw for an AIR V unit, my 4000/3500 generator seems to load out and will not start the compressor !

No idea but somebody else will probably come along with a better idea then mine, seems a lot of these generators have this thing installed on them (Has $25 hard start kit). Not sure what it does or how it works. Strangely enough you said you use it for 240 volt. Looked at the picture and didn't see a 240 volt connection.
If you are using the what look like the 120 volt circuits you can't over load the unit. Maximum current draw will cause it to go into protection mode and shut down the power load. The following is an exert from the owners manual which I got from Yamaha's site. Link at the end of this post.

Hope this helps


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16
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q
760-029
AE00788
Overload indicator light
The overload indicator light
1
comes on when an over-
load of a connected electrical device is detected, the
inverter control unit overheats, or the AC output voltage
rises. The electronic breaker will then activate, stopping
power generation in order to protect the generator and
any connected electric devices. The AC pilot light
(green) will go off and the overload indicator light (red)
will stay on, but the engine will not stop running.
When the overload indicator light comes on and power
generation stops, proceed as follows:
1. Turn off any connected electric devices and stop
the engine.
2. Reduce the total wattage of connected electric
devices within the application range.
3. Check for blockages in the cooling air inlet and
around the control unit. If any blockages are found,
remove.
4. After checking, restart the engine.
http://www.yamahamotorsports.com/assets/service/manuals/0/LIT-19626-01-23_1423.pdf

You have to be sure the generator produces not only enough power to run the AC but also to handle the load when the AC initially starts or the compressor kicks on. That means it either must have a continual wattage rating to handle the load or a surge rating that's powerful and long enough to handle the start up.

When the compressor starts, initially there is a very large current draw by the compressor motor. Depending on the size of the generator and compressor motor, this could cause the generator to stumble for a few seconds, but this should smooth out within 3-5 seconds.

Connect the air compressor to house plug and check amp draw with tester. More than likely you will find that the initial start amp load is too great for the generator. Do not rely on the information stated on the compressor. Generators and air compressors do not get along. At our repair shop, we find that most contractor /construction type generators that were used for running air compressors had failed or leaking capacitors and were not producing correct amount of power. You could have gen set with weakened capacity and air compressor that is drawing more than stated on plate. Good luck

It depends on the appliance wattage and type, IE inductive loads like motors, HVAC compressors etc are harder on it. You didn't mention the 120V btu's but if the unit is running correctly and has no or light other loads on it, it should start it. be aware that it takes about 6 times the current to start the HVAC that it does to run it, so how much other loads are on the generator (base load) is critical

What size circuit breaker is on the generator that is tripping? You'll need a 20amp for AC alone, then consider other things that are drawing current when RV plugged in like , converter, fridge etc that may be drawing current at same time. Make sure fridge is on propane, as well as water heater if you have electric element option on water heater. AC may only draw 12-15 amps when running if good and clean and wired properly, but will draw 17-18 amps when compressor kicks in. Perhaps generator not designed for that surge?

to sort out you problem i would take the carburtor apart and give it a good clean especially the main jet i would also replace the spark plug just to rule that out it could be a weak mixture causing your problem as you increase the demand for power the throttle will open drawing in mre air & fuel if the fuelis limited due to dirt this could be the cause.
as a quick test run the compressor and close the choke (cold start device) as that will cause more fuel to air and see what happens it isnt guaranteed to work but might give an indication.

To find the wattage of the unit running, multiply the voltage (220?) by the amp draw (marked on unit) The problem I am seeing is the initial amp draw is prob. going to be close to 60 amps, and I am not sure if your generator is capable of this. Hope this helps

you must check the amp draw with a meter to verify if the compressor is locked up. if it draws L.R.A. amps which should be listed on the compressor it is lock up and needs replaced.
Phil

Honda generators are very reliable and are easy to adjust. The best way to check for proper output is to use a meter that can check cycles and voltage. Set meter to htz or freq and adjust the engine governor to 60 cycles. When the engine is turning 3600 rpm it is at max power and the generator may be producing ac voltage ranging from 115 to 125 at 60 cycles. When you draw power from the generator the engine governor will try to overcome the stress and maintain 3600 rpm. The engine must be well maintained to produce full power. Service oil, filter, plug and valve adjustment. Some engines have a spark arrester installed in the muffler that may become blocked with carbon. If engine is producing full power and voltage/amps is low then check brushes, capacitors, and/ or voltage regulator. Most problems occur when too much power is requested from rated generator. Example, trying to connect an 1800 watt air compressor to generator. The compressor may draw double the stated wattage upon starting and cycling. For longest generator life, It is best to use only 75% of rated output. On an 1800 watt generator use max wattage 1350. If you actually need to use 1800 watts then the best generator would be a 2500 watt. enjoy