Where does the energy go when two out of phase signals are added?

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Discussion Overview

The discussion revolves around the behavior of energy in a solar energy system, particularly focusing on the implications of adding out-of-phase signals and the effects of an incorrectly wired inverter. Participants explore the question of where energy goes when signals cancel each other and the potential reasons for increased energy consumption observed after an inverter replacement.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant describes their experience with a solar energy system and the issues faced after an inverter replacement, questioning where the additional energy recorded by the service meter went if it was not consumed.
  • Another participant suggests that if the inverter was wired backwards, it would likely shut down rather than cause increased consumption, implying that the panels were not generating electricity during that time.
  • A different participant counters that the production meter indicated the solar panels were producing energy at the same rate as before the inverter replacement.
  • Another participant questions whether the solar panels could indeed reduce grid consumption by 50%, seeking clarification on the system's capacity.
  • One participant proposes the possibility of a metering issue, suggesting that the solar panels might have been connected incorrectly to the consumption meter, which could explain the observed increase in consumption.
  • A participant provides specific data about their solar energy generation and consumption patterns, indicating that their system can produce significant energy under optimal conditions.

Areas of Agreement / Disagreement

Participants express differing views on the cause of the increased energy consumption, with no consensus reached on whether it was due to the inverter wiring, the solar panel output, or a metering issue.

Contextual Notes

Participants discuss the implications of out-of-phase signals in the context of energy cancellation, but the discussion does not resolve the underlying technical questions regarding energy behavior in such scenarios.

Who May Find This Useful

Individuals interested in solar energy systems, energy metering, and the technical aspects of signal interference may find this discussion relevant.

steve wall
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I have a solar energy system at my home. It basically uses an inverter that converts DC from the solar panels to AC that is phase-locked to the service from our electric company, then adds the two together to feed the home. There are two meters – one to measure the energy produced from solar, and one to measure the energy we buy from the electric company. A separate system measures our total home consumption.

Last March, the inverter failed and was replaced. After the replacement, I noticed the total consumption increased by as much as a factor of two, and complained. After a service call they told me that they had wired the new inverter backwards, but that it was now fixed. That made sense to me – hooking up the inverter backward would have meant the solar was subtracting from the paid service. Anyway, the consumption went back to normal, but the additional consumption was recorded by the service meter and I had to pay for it.

My question is, where did the additional energy go? We didn’t consume it, and nothing got burning hot. Or, in more general terms, when you add two signals out of phase and thus cancel them, where does the energy go? For example, if I were able to align two lasers (same wavelength and perfectly coherent) so that the electric fields canceled each other, would the light disappear? Would the lasers stop consuming power? Would they burn each other out?
 
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If it was wired backwards I'm pretty sure the inverter would just shut down. So your consumption probably doubled because your panels wern't generating any electricty NOT because they were somehow feeding it in out of phase.
 
No, according to its production meter it was producing at about the same rate as always.
 
Do your solar panels put out enough power to reduce your consumption from the grid by 50%?
 
Only other thing I can think of is some kind of metering issue. If they connected the solar panels to the wrong side of your consumption meter that might explain it.
 
Drakkith: Yes, on a clear summer day we generate ~ 30 kWh, in the winter ~ 20 kWh. Our consumption varies from 15 to 40 kWh depending mostly on how much we use the air conditioning.

CWatters: Thanks for the thoughts.
 

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