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Old 01-18-2017, 09:35 AM   #1
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I need educated. On page 39 of the installation manual, it sais the inverter may only be operated with ungrounded PV modules because the inverter is transformerless and has no galvanic isolation. I'm a little week on my electrical theory and want to learn what this means. Thanks. Mike,
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Old 01-18-2017, 10:34 AM   #2
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I need educated. On page 39 of the installation manual, it sais the inverter may only be operated with ungrounded PV modules because the inverter is transformerless and has no galvanic isolation. I'm a little week on my electrical theory and want to learn what this means. Thanks. Mike,
You're reading pidgoen [ alt: pidgin] Engineering English.

It is certainly true that the inverter does not use transformers.

"No galvanic isolation" is totally corn fused in this context... probably means that all bets are off WRT internal isolation// bonding issues.

The intent is to permit voltage stacking across modules... I would hazard... but don't cite me.

If we are to make American great again, we'll have to demand American born and trained technical writers.
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Old 01-18-2017, 10:37 AM   #3
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I need educated. On page 39 of the installation manual, it sais the inverter may only be operated with ungrounded PV modules because the inverter is transformerless and has no galvanic isolation. I'm a little week on my electrical theory and want to learn what this means. Thanks. Mike,
You still ground the metal of the panels, racking and conduits. It means you don't ground the positive or negative leads of the array.
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Old 01-18-2017, 03:42 PM   #4
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You still ground the metal of the panels, racking and conduits. It means you don't ground the positive or negative leads of the array.
Which could cause some problems with the now small numbers of panels that develop captive charge issues unless the cells themselves are consistently biased either positively or negatively (depending on design) with respect to the substrate and frame.
With non-isolated arrays the "average" neutral balance may be good enough. Or maybe not.


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Old 01-18-2017, 03:46 PM   #5
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I need educated. On page 39 of the installation manual, it sais the inverter may only be operated with ungrounded PV modules because the inverter is transformerless and has no galvanic isolation. I'm a little week on my electrical theory and want to learn what this means. Thanks. Mike,
You definitely do need educated, especially when you start a paragraph off with "I need educated."
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