Growatt and MPP gave different answers

mccljs

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Bridged neutral on the transfer switch or in general?
Bridged neutral on the inverter. Inverter input neutral would not be connected to inverter output neutral because there would not be anything connected to the inverter input neutral. That being said, Growatt may support the inverter neutral input being connected to the inverter neutral output. They may even be connected inside of the inverter. You would have to ask them.
 

timselectric

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You're going to have to settle on something.
Or, this continued changing conversation is just going to get more confusing.
 

MT off grid

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Yes
But once again, if you change the plan you have to change grounding.
I'm probably gonna abandon my transfer switch due to 4 of my circuits being multiwire branch circuits, i have an electrician coming to see about doing a transfer switch on the bottom half of my split buss
 

timselectric

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I have done this several times. But, I thought that you said that your inspector wouldn't approve.
 

MT off grid

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Bridged neutral on the inverter. Inverter input neutral would not be connected to inverter output neutral because there would not be anything connected to the inverter input neutral. That being said, Growatt may support the inverter neutral input being connected to the inverter neutral output. They may even be connected inside of the inverter. You would have to ask them.
I have it confirmed that the 3000TL LVM-ES has no bonded neutral
 

MT off grid

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I wouldn't either.
But, I'm confident in my abilities and knowledge.
I called the inspector and he said he has never come across a request like mine and he didn't know exactly how it would work, told me to hire an electrical engineer to develop a plan to submit to him for approval
 

timselectric

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I called the inspector and he said he has never come across a request like mine and he didn't know exactly how it would work, told me to hire an electrical engineer to develop a plan to submit to him for approval
Don't be surprised if he does a drive by, now that it's on his radar.
 

Zwy

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It gets a little more complicated if you plug the AC input into a house outlet for charging but I think in that case, the inverter would be considered an appliance, like one of those BLUETTI power stations. Unfortunately, you may create an objectionable current path since you will have a N/G bond in your main panel and in your extension cord panel.
One problem, if there is any N-G bond created by an inverter or subpanel after the inverter (inverter does not bond N-G), and one uses something like a Reliance transfer switch that does not switch neutral, you will find the breaker on the inverter will most likely trip due to the N-G bond in the main panel being a "short" to ground.
 

jyoung1

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Dec 8, 2020
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Reliance does have a transfer switch that switches neutral.

Panel/Link X-Series Neutral Switching Panels​

 
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