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Old 08-02-2013, 03:26 AM   #16
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As pointed out elsewhere in this thread, some of those inverters' grounding terminal may be center-tapped on its output (making the voltage between the neutral and ground value = 60). You still get 120 Volts operating between the hot and neutral, but the ground is floated between them.

IF you are connecting the neutral and grounds together with that transfer switch (or at any other place in your premises wiring), that could be causing a half-short circuit condition.

Check to ensure your neutral is not intentionally grounded. Your transfer switch should be isolating and switching the neutral in order for many of these inverters to operate properly.
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Old 08-10-2013, 09:43 AM   #17
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got it all working. zero clue why it wasnt working prior. both 110s together= 110v. plugged it in and have had it running for 5 days now without issues. voltage is good all around. thanks for the advice though!
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Old 08-10-2013, 06:30 PM   #18
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be careful for your appliances some of them may broke if running for long periods on a modified sine wave inverter
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Old 08-11-2013, 10:38 AM   #19
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Quote:
Originally Posted by carmusic View Post
be careful for your appliances some of them may broke if running for long periods on a modified sine wave inverter
I keep larger appliances (I.e. entertainment center, mini fridge, fish tank) on surge protectors so they should be fine I'd imagine? Other than those items I'm only running lights
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Old 08-11-2013, 03:53 PM   #20
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Surge protectors will not "clean up" a modified sine wave.
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Old 08-11-2013, 10:31 PM   #21
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Can you explain the issue? I'm not an electrician. for me if its seeing steady 110v I assume its fine.
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Old 08-12-2013, 08:48 AM   #22
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some great explanation here
http://blog.gogreensolar.com/2012/06...-modified.html
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Old 08-12-2013, 05:25 PM   #23
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Quote:
Originally Posted by lkout4trucks View Post
Can you explain the issue?

The problem is caused by hash created by the fast sharp switching
in the output stage of the invertor.
Look at the shape of the waveform in the link posted above,
See at each corner of the waveform (sharp switching action)
There is usually a lot of overshoot here,in the form of spikes.
The voltages seen in these spikes can be very substancial indeed.
Some form of filtering or dampening will help, but cheap invertors
will skimp in this area, as good filters are usually expensive.

these spikes usually cause the buzzing.
Not to mention the stress they put on the output stage
because of the high voltages involved.
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Old 08-12-2013, 10:52 PM   #24
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Basically since my main use for my setup is lighting and the occasional need to power my pellet stove or mini fridge I will stick with the inverter I have now. In the future I may need to upgrade but that depends on what my needs are at that point. That blog was excellent info.
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