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Old 05-13-2017, 11:20 AM   #1
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Isolation Transformer

Trying to decide on a isolation transformer. The three in running are MV, Vitron, and Charles. I have a lot of MV products on board now so I'm leaning that way even though the price is twice as high. But where I'm having trouble is the wiring connections. The MV 7000 wiring diagram show a 220v primary with one each L1, N, PE; same with secondary. If I have a 50A, 120/240 (two hots, N, & PE) shore connection how do I get a 4 wire in and out from a 3 wire in and out system. Hope I'm explaining this OK.

Thanks
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Old 05-13-2017, 11:45 AM   #2
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The input to the isol trans does not need the neutral. Just the two hots, 240v across the terminals. Output should have two hots and a center tap neutral.
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Old 05-13-2017, 12:52 PM   #3
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This is my biggest complain with both Victron and Mastervolt. They have completely blown off support for North American split phase power. Everything is euro-power designed. Now I agree that our split phase power is pretty funky, and that the euro-power approach is probably preferable, but NA is the way it is and it ain't going to change, and it represents what must be at least 1/2 the market for such products, if not more.

Both companies offer single phase 120V products, and single phase 230V products, but neither of them offers stackable 120/240V inverters, let along a single split phase inverter a-la Magnum. And their isolation transformers don't have a neutral on the secondary.

Go with Charles.
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Old 05-13-2017, 12:56 PM   #4
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Be aware that Charles has publicly stated that they are leaving the marine Business.
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Old 05-13-2017, 02:53 PM   #5
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Be aware that Charles has publicly stated that they are leaving the marine Business.
Only certain parts. I believe the isolation transformer market was staying, but I could be wrong.
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Old 05-13-2017, 05:03 PM   #6
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You can buy industrial isolation transformers, they do not have to be "marine." Mine is not marine. Google them and save a bunch of money. The one I replaced was a GE.
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Old 05-14-2017, 12:22 AM   #7
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Only certain parts. I believe the isolation transformer market was staying, but I could be wrong.


That's what I read, that Charles was keeping the isolation transformer part of the business.
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Old 05-14-2017, 04:27 AM   #8
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You can buy industrial isolation transformers, they do not have to be "marine." Mine is not marine. Google them and save a bunch of money. The one I replaced was a GE.
X2, a transformer is a transformer. Very simple, no moving parts, why pay marine prices.
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Old 05-14-2017, 06:48 AM   #9
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"X2, a transformer is a transformer. Very simple, no moving parts, why pay marine prices."

That was true for decades , decades ago, but todays electronics ," transformers" & chargers may take the incoming power , break it down then reassemble what ever is desired.

This is fantastic for the world cruiser who may get almost anything dockside.

Even for the local cruiser the ability to receive the voltage required is great.

A modern unit will weigh very little compared to the bundles of wire and iron old style transformer.

Some modern battery chargers have this ability , so a boat set for mostly DC (with AC from an on board inverter) can survive unusual electric in strange places.
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Old 05-14-2017, 07:56 AM   #10
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My Charles Isolation Transformer with power boost does all sorts of things, including accepting European 240 v power and converting it to North American 240 v power. It does not however change the 50 hertz European to 60 hertz North American.


What is interesting is the boost factor. I have been in marinas where the power at the end of the line was only 100 volts and the boost brought it up to 110 volts.
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Old 05-15-2017, 03:50 PM   #11
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Thanks Twisted,
That pretty much explains it.
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Old 05-15-2017, 09:16 PM   #12
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You can buy industrial isolation transformers, they do not have to be "marine." Mine is not marine. Google them and save a bunch of money. The one I replaced was a GE.
You can certainly do this, but there is a difference between an industrial transformer and one intended for marine use like the Charles. The marine transformer has two separate and isolated grounds. The shore-side ground ties to an internal shield inside the transformer, and the boat-side ground it the more typical case ground. There is some incremental protection with this approach. How much and is it worth it to you? Only you can decide.
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Old 05-16-2017, 09:29 AM   #13
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Just got off the phone with Charles Ind.. I asked about the 7.5 Kva specs showing the primary as 240v. My main concern was if was set like the European models. He said no; the primary was a standard 240v with the secondary a 240/120v and it will work fine with standard USA shore power.
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