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This forum post is informative. Evidently, the schematic is incorrect. Therefore the polarity light was coming on. Also a story of good customer service. The TugNuts • View topic - Isolation Transformer Question

Interesting. I didn’t see anything on the cost. The grounds don’t terminate at the transformer. I suppose that would work, just not the way I usually think of the wiring on one. A mention of cost for the 30 amp version here...

I looked at theirs after starting this discussion. Roughly $7500 and couldn’t find a vendor with them in stock. That is with boost which I guess I wouldn’t need. Looks like about $2,500 for the non boost 50 amp one.

Helmsman supplies a NovaKool RFU 9000. One alternative would be to get the 9200 which has dual compressors, one for the fridge and one for the freezer.

Chris’s comment creates a question for me. It appears that Charles is out of the marine business. I don’t think Victron makes a 50 amp isolation transformer. Does anyone know which 50 amp isolation transformers are the highest quality?

There really isn’t an advantage to doing that inside the boat. You would still end up with two 30 amp feeds totaling 7,200 watts. The reason you have 30 amp breakers on the boat within 10 feet of the boat outlets is to protect the wires to the panel by limiting it to 30 amps. So, unless you...

I should have been clearer in my first couple of posts. By not doing so, I created unnecessary confusion.

See post 30 above. The 50 amp is a 120/240, which is what you would find on most boats using a 50 amp feed. The 50 amp 120 volt can be found on older boats, but Very few, if any, newer boats.

Several questions regarding why I would consider moving from 30 amps to 50 amps. To understand why it would be an advantage requires a little math. A 30 amp feed supplies 30 amps x 120volts equaling 3,600 watts. Since the boat has two 30 amp feeds, that equates to 7,200 watts of available...

Thanks! Is your shore power 30 amp or 50 amp?

Ok, that makes sense.

Thanks for the Link to your discussion. That helped quite a bit. Now I will need to get my arms around the issue Steve D came up with on boosting versus non-boosting isolation transformers.

I think I will be fine. I have two AC’s (used for heat also), an induction cooktop, convection microwave, and an electric grille on the FB. Obviously, with all of that and the hot water heater, I will need to load balance sometimes. A friend of mine who is buying the Helmsman 43E will have...

Yep. I would need to add that to the specs. thank you. I have most of that from previous work I have completed. Most of my electrical work has been electronics, which sometimes entails branch circuits.

That is my fault. I should have been clearer. The idea would be to go to a single 50 amp 125/250v from two 30 amp 125v inlets.

We have already discussed that with them. And, yes they would have been more than happy to. I decided on the 30 amp and I am ok with that. The purpose of this discussion was to obtain an “inventory” of the pieces needed, if I find after a couple of years that I am not happy with my decision. I...

Thanks for the costs. I would assume that didn’t include the new 50 amp SP cables? I have studied ABYC electrical standards for years, with a particular emphasis on electrical, and may take the upcoming course they offer in September just as a refresher. I would employ a certified ABYC...

Thanks. Not confused at all. The boat comes with two Victron Isolation transformers for 30 amp service. There is a connection for the ground wire in, and the ground wire out to the panel. If I were to go to a single 50 amp feed, then the two 30 amp Victron isolation transformers will not work...

There is a NL generator on board. What complexity do you see? The boat comes with isolation transformers for two 30 amp circuits. If I were to ever go down this path, I would probably pull them, and put a galvanic isolator for the two inbound load lines. The 50 amp isolation transformers are...

Thanks for the input. I am not changing to 50amp 240 volt at this point, anyway. I am merely trying to get an idea of what it would take to get the higher wattage. I agree the wire would need changed. The flexibility you mention is not a big enough issue for me to be too concerned about. I carry...

Thanks. Yes, I should have stated breakers, not fuses. I am not upgrading. Merely trying to develop a full list of what would be entailed to do so. I am trying to understand what the full list of changes would entail, to do this if I wanted to do so at some point in the future. If I do, I would...

Does anyone have experience with upgrading the electrical system from 30 amp to 50 amp? I am not actively planning this, but a discussion on another forum piqued my interest. On the surface, it would seem that the following would need to occur: Change out the inbound outlet to 50 amp. Change...

Yes, the Ethernet connector is for connecting to another router. Edit: Sorry, didn’t see Dan’s reply.

This is a bit of a qualitative discussion. I would recommend an Eero mesh router. The advantage to the Starlink mesh router is simplicity. Also, it’s disadvantage. I have the Eero and their support has been great. They also support IPv6 which helps future proof it somewhat. The easiest way to...