We can't see in a video what the DMM shows, and only one DMM is visible.
Please use two DMM. Or, repeat the test with DMM ammeter connection in series with load (e.g. light bulbs) and then DMM volt meter in parallel with load, under same wind conditions. Then calculate W = V x A. That should be correct for a resistive load.
LED bulbs are likely not a good test load for AC source. You would have to use an AC watt meter, or capture waveforms with a scope.
Bank of resistors you could switch, allowing you to determine watts vs. resistance, would be best.
No it is not as you say about the amps that is again a wrong point in the same way as when you said that the red turbines where static and you do not mention it in this comments because I showed you in the picture where to look to check that it was not static. It is a multi meter attached to the 2 cables that brings the current of the several dc motors used in the test. The video of the hawt was done long time ago, but I will do another one!!!
Your later video clearly showed rotation. Maybe it was something about speed of image sensor in (cellphone camera?) and frame rate, looked to me like turbine was being buffeted back and forth. My mistake.
You have a meter connected to something. It can only measure one parameter. Need to know both voltage and current from a single circuit. If AC, need to know phase, possibly waveform.
Rhino, do not simplify your arguments to misleading statements as (With no load a lot of "small" wind turbines will have huge voltage spikes and spin so fast they could eventually fly apart, hence the reason why many require a load of some sort at all times to prevent that.) it was measured in voltage and in amps, so do not pick just voltage to decorate your 2 sentences. When you measure amperage there is a load!!!! If you have ever measured a turbine spin with your hands just change from voltage to amperage and you will notice that it is more hard to spin.
If the circuit has a generator and a DMM but nothing else for a load, when DMM is connected to measure voltage, generator is operating unloaded and DMM reads open circuit voltage.
When DMM is connected to measure current, generator is operating into a short, and DMM reads short circuit current.
Voc x 0 Amps = 0 W
0 Volts x Isc = 0W
We want to see V(load) and I(load), with a resistive load (not inductive, not capacitive.)
Then calculate watts delivered to the load.
You have not stated a particular wattage that was delivered in one test. Only voltage. Or current.
Power at some windspeed is performance. Power divided by swept area is a figure of merit.
Can I measure amps with a multimeter?
A digital multimeter is a test tool used to measure two or more electrical values—principally voltage (volts), current (amps) and resistance (ohms). So if you are saying that when the multi meter was measuring voltage ignoring that it measured also amperage then sorry but you have a lack of information or you did not thought about it and you preferred to concentrate in voltage so your reply was having more sense. The term amp load is used to indicate the power you get from the main electricity source or transformer. Amperage is the official term used for the measurement of the total electrical capacity.
Of course we know what parameters a multimeter can measure.
When you used it to measure voltage, it was not measuring current. When you used it to measure current, it was not measuring voltage. The load it presented to the generator differed between those two measurements.
You can buy devices that present load and measure power. There are battery testers. There are PV panel testers. These measure voltage and current simultaneously, sometimes sweeping to create a curve.
