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Old 07-21-2021, 11:18 PM   #21
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Originally Posted by Pau Hana View Post
The boat was set for manual switching between ship and shore prior to the Quattro install last year. Currently, the AC2 input is being used (from iso transformer to Quattro) and it has worked flawlessly switching between shore and inversion via the internal transfer switch.

The final piece is to connect the generator to the AC1 input and utilize the functionality of the Quattro to switch between the AC sources.

Is there an easy way to bond generator neutral to ground?
Yes, look for the wires that come from the generator. On my boat this is a two pole generator breaker with a slide lockout, your boat might be like that or a rotating switch to choose sources.

Just connect the white wire to your ground buss.
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Old 07-21-2021, 11:22 PM   #22
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I agree that the 50-60V between generator ground to neutral, and ground to hot is because the neutral isn't bonded to the ground in your test.


But you need to step back and understand how your boat's neutral to ground bonding is intended to work. A lot of commonly given advice is correct, but assumes a galvanic isolator, not an isolation transformer.


With an isolation transformer, it's possible (and I think preferable) to bond the neutral and ground on the boat in one permanent location, and have a common neutral throughout the boat. There would NOT be separate bonding points at the generator or inverter, and you would not use any bonding relay capability in the inverter. When you connect the generator to your power system, it utilizes the central ground to neutral bonding. But if the generator is not connected via some selector switch then it's ground and neutral will not be bonded via the boat's central bonding connection, will have a floating ground, and give exactly the sort of readings you are seeing.
Not a bad idea... Only challenge, is that some inverters force the ground-neutral bond.

Another challenge is you would then need to go to a single pole source selector, which is not a problem but is something to consider.
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Old 07-22-2021, 10:54 AM   #23
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Yes, look for the wires that come from the generator. On my boat this is a two pole generator breaker with a slide lockout, your boat might be like that or a rotating switch to choose sources.

Just connect the white wire to your ground buss.
I'll check it this afternoon.
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Old 07-23-2021, 08:01 AM   #24
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Yes, look for the wires that come from the generator. On my boat this is a two pole generator breaker with a slide lockout, your boat might be like that or a rotating switch to choose sources.

Just connect the white wire to your ground buss.
Jumpered the neutral to the ground in the generator, connected, and tested all systems. 100% operational in all aspects including automatic switching between shore, genset, and inverted 120V.

Appreciate all the sound advice!
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Old 07-23-2021, 08:01 AM   #25
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Jumpered the neutral to the ground in the generator, connected, and tested all systems. 100% operational in all aspects including automatic switching between shore, genset, and inverted 120V.

Appreciate all the sound advice!

Perfect!
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Old 07-23-2021, 08:23 AM   #26
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Jumpered the neutral to the ground in the generator, connected, and tested all systems. 100% operational in all aspects including automatic switching between shore, genset, and inverted 120V.

Appreciate all the sound advice!
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Old 07-23-2021, 07:16 PM   #27
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A neutral to ground bond is required by ABYC at all sources of power aboard a boat to be compliant with the ABYC Standards. It is not a complex subject. Bond N > G at the generator output, the secondary of an isolation transformer and at the inverter or inverter/charger output when inverting. A compliant inverter or inverter/charger includes relays that ensure that the N > G bond is established before inverting and is broken when qualified mains (shore or genset) power is presented at the input terminals.
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