Renewable Energy Questions/Discussion > Automation, Controls, Inverters, MPPT, etc

Inverter Build Project.

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welshman:
I put a multimeter in series and it's showing a no load current of 9 amps. that's almost 300 watts. huge! let's see what a choke/inductor or whatever it actually is, does to the current.

Pete:
Maybe the wattmeter was having trouble with the powerfactor. As the coils in the transformer are very highly inductive loads the current would have been lagging the voltage by a long way. So the apparent power and true power are not similar with highly inductive loads.
On our inverters what is drawn on the DC side from the battery is what matters to us, not what a wattmeter reads. Unless we are charging ourselves for the power we use.
Have fun with it
Pete

welshman:

--- Quote from: Pete on October 15, 2020, 04:50:36 pm ---Maybe the wattmeter was having trouble with the powerfactor. As the coils in the transformer are very highly inductive loads the current would have been lagging the voltage by a long way. So the apparent power and true power are not similar with highly inductive loads.
On our inverters what is drawn on the DC side from the battery is what matters to us, not what a wattmeter reads. Unless we are charging ourselves for the power we use.
Have fun with it
Pete

--- End quote ---

it seems you are right Pete. i put a small 300 watt load on it and the readings summed up properly.

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