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Old 04-08-2016, 17:25   #16
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Re: Inverter case charged

Back to basics.
1. The inverter output must have a neutral to ground bond.
2. The genset must have a neutral to ground bond at its output.
3. The inverter case must be tied to the vessel ground with a conductor the same size as the B+ feed or one size smaller.
4. The shore power safety green (grounding) conductor is tied to the shield between the primary and secondary windings of the isolation transformer, not the case.

So far your installation appears to be unconventional but all the boxes are checked.

However, before any more help can be provided; what is the model number? A quick Google of AIMS shows that Amazon has an AIMS inverter/charger listed. Is your unit an inverter/charger as this changes things quite a bit?
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Old 04-08-2016, 17:31   #17
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Re: Inverter case charged

The correct answer is that you need a qualified marine electrician to inspect and correct your boat's electrical system ASAP. I wouldn't be poking around electrical until this has been corrected.


A marine electrician will have several years of schooling and several years of apprenticeship and experience. You can't get this from reading a book and thinking you can is an insult to the electrician.
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Old 04-08-2016, 19:19   #18
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Re: Inverter case charged

This is an AIMS Power 3000 watt listed for everything inverter, not inverter/charger. I've been diverted from dealing with it by a perfect storm of other demands on my time. Come Saturday, I should be able to check through all the advice above and hopefully figure it out. Thanks, and I'll get back to you in 48 hours.
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Old 05-08-2016, 02:15   #19
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Re: Inverter case charged

From the AIMS manual:

Connect the
Ground Cable (not included; #2 AWG or larger cable recommended)
lug to the Ground terminal, see BACK above. Securely tighten

4. Connect the Ground Cable to an earth ground, such as metal water pipe or to the vehicle's ground when used in a vehicle.


The grounding wire for your plug should work as 'the vehicle's ground' if the boat is wired properly.
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Old 05-08-2016, 12:10   #20
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Re: Inverter case charged

Quote:
The grounding wire for your plug should work as 'the vehicle's ground' if the boat is wired properly.
Don- If I understand you properly, the action that you propose could negate the benefits of the isolation transformer.

As I posted in#16: Inverter output safety ground (grounding) terminal and output neutral (grounded) terminals must be bonded when inverter is inverting. They are to be un-bonded if/when the inverter is passing through qualified current. (Not possible with the OP's system as described.)
Further, the case ground (required by ABYC) to be the same size or one size smaller than the B+/B- feeding conductor is to be terminated at the vessel ground.
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Old 08-08-2016, 11:05   #21
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Re: Inverter case charged

I think you are right Charlie--I forgot about the isolation transformer.

Interesting situation. The AIMS manual shows a GFCI on the output of the inverter. Why didn't it trip when the hot case bit the OP??
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Old 08-08-2016, 19:33   #22
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Re: Inverter case charged

I've made one quick test - plugged a two conductor work lamp into the inverter. It did not result in a hot case. Ergo, the problem is down stream. Tomorrow I'll compare the inverter with the connections from the genset and from shore and see what's different. Yes, you're right - the outlets on the inverter have ground fault breakers, and they are not tripping.
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