Nigel Calder & Jeff Cote Talk Marine Electrical - Part 5 of 11 - Isolation Transformers

Nigel and Jeff are together again to talk about all things marine electric! Over the next few Sundays, they will talk about a number of different topics in this 11-part interview:
Part 1 - The Basics
Part 2 - Grounding, ELCI, and ESD
Part 3 - AC Ground to DC Ground Tie
Part 4 - Galvanic Isolators
Part 5 - Isolation Transformers
Part 6 - Electric Propulsion
Part 7 - Portable Generators
Part 8 - 48V Systems
Part 9 - Lithium Batteries
Part 10 - Large Solar Arrays
Part 11 - Drop In Lithium
Bonus Track - Favourite Products & Identifying Single Point Failures on your Boat
Read more about Nigel Calder’s HowToBoat Course, boathowto.com/#aff=pysystems
Check out the PYS website for more information on the difference between an isolation transformer and a galvanic isolator, www.pysystems.ca/resources/ar...
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[@alfredochiappini1056]

Going to school for this exact subject right now, love your videos Jeff, keep it up!!

[@willhelmke2798]

Thanks for this Jeff! Looking forward to the rest of the conversation? You two together are a powerhouse of info!

[@PacificYachtSystems]

Glad you enjoyed it!

[@BitcoinNewsTodayLive]

I have the universal charger to inverter setup on my Tayana37. As Jeff says, constant electric resistant heat is the only limitation. By running my reverse cycle AC in the winter, I can mimick cooling loads and that works for 40+ deg F water. Below that, it's an extension cord and fan heater or time to light the Dickerson diesel furnace :-) Many thanks to you both for this series!

[@LucScheffers]

Hi, nice video. question: At 4:54 Jeff states that an isolation transformer also "sorts out polarity issues" Saying: fase and neutral coming from shore reversed. But if i measure with a voltage probe (screwdriver with light type) i see a fase on the primary side and on the secondary side. If i reverse the polarity on the primary it also reverses at the secondary side. Which to me it seems that the secondary has a fase that is dependent on the fase on the primary side. How can it than "solve" polarity issues? Thanks in advance.

[@Justaguy0420]

I have a 240vac split phase boat. I have two multiplus 2s. Can I just use one isolation transformer to isolate L1 and the grounding conductor from the shore power pedestal and run the other L2 straight to my slave inverter? Or do I have to buy two isolation transformers for a split phase application. Or a single plot phase isolation transformer?

[@BitcoinNewsTodayLive]

Could you recommend any specific chargers that can handle 120-240v. I struggling to find one. Sailing to England next year and current chargers are 120v 50/60hz

[@stormer6364]

Using the alternative method Nigel suggested using chargers for the isolation, How is the isolation using modern switchmode battery chargers? I know still to this day when working on switching power supply's, we still need to use an isolation transformer for safety, as technically it's a live circuit. Toroidal transformers not sure they have the same level of isolation. Toroidal transformers I know are used in higher end audio equipment as they are very low noise.

[@EricEversonArtAndDesign]

Admittedly, the question of grounding and DC negative systems is the bit I've struggled with most when it comes to marine electrical. Wouldn't keeping the grounding connections separate from DC negative offer a small measure of protection for the electronics in the event of a lightning strike?