Question about Inverter Electronics - Others

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Posted on Jan 02, 2017

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SOURCE: i got a output voltage of 100.1 on a trace dr3624

The rms voltage is what counts, because it tells how much power the output will deliver to a resistive load. Inexpensive multimeters on their AC ranges are usually average-responding rms-calibrated meters. This means they measure the average of the absolute value of the AC component of the signal, and display that average multiplied by about 1.11 (actually, pi over sqrt(8)), the ratio of rms to average value for a pure sine wave. That way, the meter will give the right rms reading for a sine wave.

If the signal is a square wave, where the average and rms values are equal, the average-responding meter will read 11% too high.

Many inverters put out a modified sine wave (MSW), which sits at zero for a while, goes to a constant positive level for a while, goes back to zero for a while, and goes to a constant negative level for a while to complete the cycle. The positive and negative parts of the signal have the same magnitude and duration.

The rms and average values of an MSW depend on its duty cycle D, the fraction of a cycle for which the signal is not at zero. In a well-designed inverter, the duty cycle will be adjusted when the DC input voltage goes up and down to maintain the nominal rms output voltage. If we use peak voltage Vp to mean the magnitude of the positive and negative voltages the signal goes to, then Vavg for an MSW is equal to Vp times D, and Vrms is equal to Vp times the square root of D.

The duty cycle for which an MSW will have the same rms to average ratio as a sine wave is 8 over pi squared, or 81%. For any duty cycle less than this, an average-responding meter will read a lower voltage than the inverter rms output, and for a duty cycle higher than this, the meter will read too high.

If your MSW inverter is putting out 120 volts rms and its duty cycle varies from 50% to 75%, the meter reading will vary from 94 volts to 115 volts. I avoid the problem by using a Radio Shack 22-174B true rms digital multimeter.

Posted on Sep 01, 2012

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I like to ask, is the voltage from the solar panel messure with some load connected or is open circuit, normally solar panels produce high voltage than the working system, the reasson for that is to have Amperes in of to charge the batery, these is related to the size and power generated by the panel.

No need a resistor or in any case use a voltage regulator to prevent over charge.

No need a resistor or in any case use a voltage regulator to prevent over charge.

Apr 14, 2015 | Inverter Electronics - Others

Solar panels are typically rated at .3 volts per cell. These cells are connected in series until they add up to 12 volts,24 volts or 36 volts depending on the solar system. The more cells you have the higher the charge rate of the batteries connected to the system. The DC voltage from the cells are used to charge the batteries then the voltage from the batteries is used to drive a DC to AC- convertor which is the power used by your home. The more cells connected the quicker it will charge the batteries and the more batteries connected the more power the solar system can provide.

Oct 04, 2014 | Solar 200 Amp Murray Mda 2200 Main Circuit...

Is the switch still there? If the switch is still there you might be able to activate it with a pencil eraser or something like that.. If you have lost the switch then you will not be able to equalizer your batteries

Jun 20, 2014 | Xantrex Technology DR3624 Inverter/Charger

Your calculations is correct - 220 X 0.7 = 154 watts.

If your fridge only runs on 220 volts then you need solar panels that charge 12 volt lead acid batteries and then use a inverter to convert 12 volts DC to 220 volts AC.

If your fridge only runs on 220 volts then you need solar panels that charge 12 volt lead acid batteries and then use a inverter to convert 12 volts DC to 220 volts AC.

Jan 13, 2012 | Kelvinator Refrigerators

Are you using a true-RMS voltmeter to measure the DR's output? The DR's output is modified sine wave, and a cheap average reading AC voltmeter will give you a reading of 90 volts or so. Alternately, if you have an oscilloscope, you can verify that the modified sine wave is around 170V peak to peak. It should alternate in segments of -170, 0, +170, 0... The duty cycle and peak voltages will vary with the inverter load.

- Tom, Sun Electronics International, Miami, FL

- Tom, Sun Electronics International, Miami, FL

Oct 03, 2010 | Xantrex Technology DR3624 Inverter/Charger

the solar panel is just to charge your inverter,if it is charging and
the inverter is on it will drain the current the solar panel is
supplying to the batteries,this makes it look like it is not charging
,so i advice you to switch off you inverter when charging it,get
another set of batteries connected to your solar panel then charge
both, let them be separated so that the new one is not in use so that
when solar is out you can switch to the other set of batteries

Nov 25, 2009 | Xantrex Technology Trace Series Inverter /...

The rms voltage is what counts, because it tells how much power the output will deliver to a resistive load. Inexpensive multimeters on their AC ranges are usually average-responding rms-calibrated meters. This means they measure the average of the absolute value of the AC component of the signal, and display that average multiplied by about 1.11 (actually, pi over sqrt(8)), the ratio of rms to average value for a pure sine wave. That way, the meter will give the right rms reading for a sine wave.

If the signal is a square wave, where the average and rms values are equal, the average-responding meter will read 11% too high.

Many inverters put out a modified sine wave (MSW), which sits at zero for a while, goes to a constant positive level for a while, goes back to zero for a while, and goes to a constant negative level for a while to complete the cycle. The positive and negative parts of the signal have the same magnitude and duration.

The rms and average values of an MSW depend on its duty cycle D, the fraction of a cycle for which the signal is not at zero. In a well-designed inverter, the duty cycle will be adjusted when the DC input voltage goes up and down to maintain the nominal rms output voltage. If we use peak voltage Vp to mean the magnitude of the positive and negative voltages the signal goes to, then Vavg for an MSW is equal to Vp times D, and Vrms is equal to Vp times the square root of D.

The duty cycle for which an MSW will have the same rms to average ratio as a sine wave is 8 over pi squared, or 81%. For any duty cycle less than this, an average-responding meter will read a lower voltage than the inverter rms output, and for a duty cycle higher than this, the meter will read too high.

If your MSW inverter is putting out 120 volts rms and its duty cycle varies from 50% to 75%, the meter reading will vary from 94 volts to 115 volts. I avoid the problem by using a Radio Shack 22-174B true rms digital multimeter.

If the signal is a square wave, where the average and rms values are equal, the average-responding meter will read 11% too high.

Many inverters put out a modified sine wave (MSW), which sits at zero for a while, goes to a constant positive level for a while, goes back to zero for a while, and goes to a constant negative level for a while to complete the cycle. The positive and negative parts of the signal have the same magnitude and duration.

The rms and average values of an MSW depend on its duty cycle D, the fraction of a cycle for which the signal is not at zero. In a well-designed inverter, the duty cycle will be adjusted when the DC input voltage goes up and down to maintain the nominal rms output voltage. If we use peak voltage Vp to mean the magnitude of the positive and negative voltages the signal goes to, then Vavg for an MSW is equal to Vp times D, and Vrms is equal to Vp times the square root of D.

The duty cycle for which an MSW will have the same rms to average ratio as a sine wave is 8 over pi squared, or 81%. For any duty cycle less than this, an average-responding meter will read a lower voltage than the inverter rms output, and for a duty cycle higher than this, the meter will read too high.

If your MSW inverter is putting out 120 volts rms and its duty cycle varies from 50% to 75%, the meter reading will vary from 94 volts to 115 volts. I avoid the problem by using a Radio Shack 22-174B true rms digital multimeter.

Aug 27, 2009 | Xantrex Technology DR2412 Inverter /...

How are the batteries for that inverter? Have you got a dead battery in the loop?

If you need further help, Iâ€™m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

If you need further help, Iâ€™m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

Jun 13, 2009 | Xantrex Technology Trace Series Inverter /...

96 volts is low. 106 volts is low. You need to be about 110 to 120 volts optimum. How is your battery input? This is crucial for the inverter to output correctly. If it needs 24 volts DC in Then make sure it's 24 volts. 48 volts means 48 volts. Check the battery voltage and compare to inverter input requirements first.

If you need further help, Iâ€™m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

If you need further help, Iâ€™m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

Jun 08, 2009 | Xantrex Technology DR2412 Inverter /...

Look I been using solar and wind power for the last 20 years and never used public utilitiy, run your inverter to a braker box and connect your pump to it donot forgfet to ground the box and the inverter. that is all what you need...remmber modified sine wave may effect the life of the pump if it is cheep it may be ok or you need to get true Sine wave.

Feb 09, 2009 | Xantrex Technology Xantrex Freedom Xmic...

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Hi Michael Maxson, have anyone able to help you with your question we need more information from you. Can you please add details in the comment box?

Are you charging batteries and then go into the inverter on this setup ?

How are the panels wired up ?

the dr3624 the 24 is the 24 v dc input voltage and the 36 is the power at 3600 watts

input current would need to be considered . I don't know how you wire up the panels to equal 24 volts into the inverter.

only guessing a bank of panels are parallel together to equal same voltage but more current. and each bank is then connected in series to equal 24 volts.

this might explain what I am guessing athttp://hespv.ca/blog/wire-solar-panels-p...

What is the wiring of panels already existing ?

Do you know anyone who has a similar inverter and what is the input dc voltage coming onto their inverter ?

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