Quote:
Originally Posted by davidmash
Why do they not use a hybrid? Both salespeople said that their systems do not charge when power is down and every article I have read since says the same thing.
Is there some cost or legal impediment?
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I believe the issue is phase matching. The inverter output has to be perfectly in phase with the power line current, otherwise it's just injecting noise when it feeds power to the grid. So it senses grid phase and creates a matching waveform from battery power. No grid, no sine wave.
When the generator is on, a transfer switch has to be present, and that will disconnect the system from the grid. The system shouldn't be feeding power back to the generator, so the control system has to know which power source it's on and behave accordingly. And when switching back from generator to grid, it first needs to adjust the phasing. So a lot more sophistication and expense would be required.
20kwhr/yr seems way too low. I can use that in a month, without A/C.