Holnda ax 800 generator does not supply 240 volt

190.3 volts isn't enough output for a 230 / 240 volt generator. It is protecting electronics that may be connected.

Specs show
Voltage (V) 115/230 120/240
https://www.google.com/search?q=L.H.+Propect+message%3F+Kipor+KDE6700TA+diesel+generator

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I would assume your assumption is correct until I checked the spec sheet which only lists 120 volt output(s). I suggest you contact the supplier or manufacturer and ask them the question. Viewing a circuit diagram should make things clearer.

You need a frequency converter - however, these are not cheap since they are intended for industrial applications - usually rated to drive motors. Depending on the device that you are driving, you might be able to adapt it for a DC input and convert the generator output to DC, or modify it to accept a 60 Hz input.
Frequency Converters
AC Power Supplies Frequency Converters

Try putting 12 volts across the commutator at the brushes. Ust a low current battery nor a car storage battery.

Good luck,

Marty

Residual magnetism of the rotor out. Lift one brush off the slip rings and flash a 12 volt battery on the rings. Reconnect brushes and start engine no output? Repeat then seek help as I need to put my grippers on it to check

Bad capacitor in the alternator field or a short in the rotor / stator

So there is a problem. Where are you measuring voltage?
Say there is L1 - N - L2. Line1 to Neutral is 120 volts, Line2 to Neutral is also 120 volts, Line1 to Line2 is 240 volts. N or Neutral ( the grounded conductor ) is center tap between line 1 and 2.
With this system, the N wire carries the unbalanced load in amperes .
Now we are talking of L1 and L2 and amperes. When L1 and L2 are conducting 10 amperes each, N carries 0 amperes, Line1 and L2 are balanced. When L1 carries 10 amperes and L2 carries 5 amperes, Line1 N carries 5 amperes, the difference of L1 and L2. This is normal.
When there is a problem with a loose connection on N, there is a resistance and will not carry the unbalanced load normally, the voltages will Chang's under load, the problem will worsen with time, a fire hazard, connected loads may burn up from excessive voltage or not work at all.
Bottom line: Make sure the N line ( white wire ) is tight at every connection and inspect for overheating damage. You may have to open the generator connections panel to check there too.

Hello,

I will accept the second option which is getting transformer.

Go ahead and get a transformer in order to step up the voltage. This is better than hooking up the 120V AC to the master inverter.

In summary, get a transformer to step up the voltage.

I hope this is clear now....

Good luck.

There are different brands of gas generators with 3500 Watts and 240 volts output that you can order from this site plus shipment in your country.

http://www.thefind.com/query.php?query=gas+generators+3500+Watts+240+volts

I hope that solve your problem
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The reason for the 120/240 volt outlet is to be able to run things like large electric heaters or even your clothes dryer as they all require 240 volts. If you use it as 240 volts you will not have maximum current output on your other outlets so you wouldn't be able to plug anything really big in. And yes you can only use is as a 120V output if you would like but you will need a special attachment or extension cord. I'm going to leave you with two reference pages I looked up that you should have a look at.

http://www.powermate.com/generators/product_detail.php?model=PM0435003&cat_id=3&w=59

http://www.powermate.com/accessories/product_detail.php?cat_id=9&model=PA0650192