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Old 04-05-2016, 07:34   #31
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Re: Do I need a Voltmeter on my AC panel?

You don't really need a voltmeter on your AC panel. If you have a reason to question the voltage you can use a cheap VOM to measure it. You probably already have one in your tool box.


You may not have installed a galvanic isolator when you installed you shore power system and that's something you really should install.
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Old 04-05-2016, 11:16   #32
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Re: Do I need a Voltmeter on my AC panel?

Quote:
Originally Posted by mitiempo View Post
ABYC only requires an AC voltmeter when there is an inverter in the system.

ABYC does not require a galvanic isolator but as posted it is a very good idea due to possible corrosion issues. But with an outboard tipped out of the water and especially if you have Marelon seacocks it isn't necessary.

I find the most useful meter is an AC ammeter. It shows my total AC load and by monitoring it I can prevent popping the breaker on the dock.

Just looked it up to be sure. 11.9.3.1.2
A volt meter is required on the Main AC panel if the panel is permanently connected to an electric motor, generator, or inverter. So no need if your running a water heater and a few outlets but if the fridge is wired to AC or you have aircon it's required.
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Old 04-05-2016, 11:19   #33
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Re: Do I need a Voltmeter on my AC panel?

CA--thanks for checking that.
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Old 04-05-2016, 12:33   #34
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Re: Do I need a Voltmeter on my AC panel?

I'm confused by that. What does my school inverter have to do with an ac voltmeter? I'm not plugging the inverter back into the ac system, it's just going out to whatever ac load I'd be running.




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Old 04-05-2016, 13:18   #35
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Re: Do I need a Voltmeter on my AC panel?

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Originally Posted by sully75 View Post
I'm confused by that. What does my school inverter have to do with an ac voltmeter? I'm not plugging the inverter back into the ac system, it's just going out to whatever ac load I'd be running.




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Nothing at all. The ABYC requirement is rooted in safety. A boat that has internal AC power can have lethal voltages even when disconnected from shore power. A meter on the panel is an extra indication when there is still live AC onboard. If you use a small inverter and plug directly into that there is not a big safety issue. But if an inverter powers the whole boat it can be a "shock" if someone doesn't realize. It's similar to the big warning signs on homes equipped with a backup generator. Disconnecting the main power feed from the grid will not make it safe.
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Old 04-05-2016, 22:34   #36
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Re: Do I need a Voltmeter on my AC panel?

I would put on in. I would also put in a amp meter. (which is more usefull...)
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