Using DC-AC inverters in parallel

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Discussion Overview

The discussion revolves around the feasibility of using multiple off-the-shelf DC-AC inverters in parallel to increase AC power output. Participants explore the technical requirements and potential issues related to phase synchronization and voltage matching.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • One participant questions the possibility of paralleling DC-AC inverters, noting the importance of phase alignment to avoid problems.
  • Another participant emphasizes the need for inverters to be locked in phase and have closely matched voltages.
  • A different participant mentions the Honda EU series generators, which can be connected with a special cable to double power, suggesting that similar principles might apply to inverters.
  • One participant advises against attempting to parallel inverters due to concerns about high voltage output, voltage spikes, and high current DC input.
  • A later reply reiterates that while it is possible to connect inverters, it requires specially-designed equipment and a specific communication connection.

Areas of Agreement / Disagreement

Participants express differing views on the practicality of paralleling inverters, with some acknowledging the technical challenges while others suggest it can be done under specific conditions. No consensus is reached on the overall feasibility.

Contextual Notes

Limitations include the need for detailed knowledge of inverter circuitry, potential voltage mismatches, and the specific requirements for phase locking.

misslexi
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I was wondering if it's possible to use two or more-off-the shelf DC-AC inverters in parallel in order to provide more AC power?

It occurred to me that unless they were in phase, problems could result.
 
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You would have to lock them together in phase and have quite close voltage matching.
 
That's what I thought Pumblechook, sounds like I'd have to have knowledge of, and access to, the circuit in order to lock phase.

What made me even think about it is Honda offers a feature on their EU series generators that allow two of them to be connected together with a special cable to provide double the power.
 
I would recommend to forget it. High voltage output and maybe much higher volatge spikes and high current DC input..
 
misslexi said:
What made me even think about it is Honda offers a feature on their EU series generators that allow two of them to be connected together with a special cable to provide double the power.

As you point out in answering your own question, it can be done, but requires specially-designed generators, and a special communicaion connection between them.
 

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