Re: Generator charging question

mfmcgovern@...
 

Per Alan's comment here is the link to Olivier Beaute's previous post regarding the Shore Power Plug and Cable on Amel SMs:  https://groups.yahoo.com/neo/groups/amelyachtowners/conversations/messages/28919

And here is a copy of the text:

Hello Alexander,

the original shore power cable installed in your SM is a 3G2.5 HO7. This is a high quality cable (HO7), with 3 2.5sqmm wires, able to carry 16 amps, not more. If you connect it to a 32A, even a 63A dock outlet, and turn on ALL of your 230V equipments, it will get fire in a few seconds, without tripping the dock's breaker.
This cable can only carry 16 amps, and if you have no other option than connecting to a 32A or 63A dock outlet, you MUST monitor your draw, and wash your clothes AFTER the scuba tanks are full.
Alan is right, the 32A breaker in the galley is made to hold the higher genset amperage.

When you connect to shore power, the cable must be as short as possible and uncoiled. Don't use unnecessary extensions. I've seen boats with 40 metres shore power cable nicely coiled in the lazarette, as the dock outlet was 3 metres from stern. This is a very safe way to get fire in your boat. If you have no choice, first uncoil your cable and spread it on the dock.

Concerning the originally mounted 110V/230V, 6kW step-up transformer (cubic grey box in engine room, optionnal) those who have it probably noticed that the 110V shore cable was bigger (3G4), able to carry 25A. So don't take more than 25A out of it (which means 15A on the 220V side of this transformer).
This transformer is NOT equipped with a galvanic isolator, meaning the ground is common to 110V input and 220V output. The 110V shore cable MUST be connected to the dock's ground/earth.
If you want to be protected from stray currents coming from your neighbors through the ground/earth wire, you need to install a galvanic isolator on the 110V input line.
Now some new products include a galvanic isolator, that's why they're called "isolation transformers".

Be careful with 220V but keep in mind that 12V or 24V could be even more dangerous (fire).

OLIVIER 

Mark McGovern
SM #440 Cara
Deale, MD USA

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