Lifted out of the water and propped up on the hard stand here in Trinidad, we find ourselves for the first time having to deal with 110 volt / 60 hertz AC power. Yes, we're in a USA influenced part of the world, but Crystal Blues is a 220 volt / 50 hertz vessel. It's been kind of amusing getting things sorted out, without blowing anything (or anybody) up. Most amusing is the fact that right now we have three (yes three, count 'em) separate shore power cords connected to support our quasi-camping life style here on the hard stand.
|
Three Different Sockets, All 60 Hz, Some 2-Phase 220v. |
First, The Shore Power Supply
Our regular shore power lead is now plugged into a 30 amp 110 volt 60
hertz supply. On-board the boat, this is passes through a Mastervolt
Ivet-C isolation transformer to raise the voltage to 220 volts, though
it is still
at 60 hertz frequency. The transformer provides voltage matching and
isolates us from the marina electrical ground system.
Most of the time we can operate from this shore power supply, as
(surprisingly) much of the equipment on-board is quite happy with a 60
hertz supply. We can use our battery charger, power tools and vacuum
cleaner, home appliances, hot water heater, media and computer
equipment, all without problems.
Only the galley microwave,
the refrigeration and the boat's central air conditioning
will not
run on 60 hertz. This is not a big problem right now - when we need to use the
microwave we switch over to the inverter and run it off the batteries. The
refrigeration and central aircon are both sea water cooled, so they
cannot be run while we are out of the water anyway...
Second, Real Time Conversion
Our second connection is direct to the battery charger only. In
the long term, once we are back in the water, most of our needs in this
part of the world will be met by the real time conversion process. Shore power will go
only to the
Mastervolt Chargemaster 100 amp battery charger. That charger
works from almost any shore supply frequency to feed the batteries up to
100 amps of (nominal) 12 volt DC power - this equals happy batteries.
At the same time, the
Mastervolt Mass Sine
inverter uses this DC supply to create a clean 220 volts / 50 hertz sine
wave power supply (at up to 2000 watts) that will run most of the boat's
systems. Once we're out of the boat yard, living afloat again, that
process allows us to run even our big water cooled refrigeration
compressor - the inverter starts and runs that compressor easily. In
fact it will also run the central aircon, but I do feel guilty even
contemplating that type of decadence at sea. Also a little embarrassed to admit
that I've even tested it (which I have) ... but then again, a
Tesla car runs air conditioning from a battery supply - why shouldn't we do the same ? Maybe when our batteries are bigger.
At
this point we should really give thanks to Bob Wisniewski who initially
opened my eyes to real time conversion and who clearly simplified our
life in the 60 hertz world . Back in the year 2000, when we were
refitting Crystal Blues for the first time, Bob owned and managed Power Protection Solutions in Queensland, Australia. We wanted to buy
a new (single combi unit) Mastervolt Inverter/Charger from him, but Bob asked
me some pertinent questions and then recommended against it.
He
said that if we were staying in the Australian / Pacific / Asian region
then a single unit "Combi" Inverter/Charger would be just fine.
However, if we planned to cruise further afield, entering the area of 60
hertz power supply, then installing a stand alone inverter and a
separate charger would serve us better - and he's right. Real Time
Conversion keeps our systems running at all times, and we don't need to
worry about the voltage or frequency of the shore supply. So a big
thanks from us to Bob Wisniewski, whose vision is keeping our beer cold
in this 60 hertz world! Note : Bob is now working with
BLA in Queensland, the current Mastervolt distributor in Australia.
Third, The Air Conditioning
It is damn hot
here. Power cord number three is for a rented A/C unit, provided by the boat yard, that operates on that
quaint 220 volt dual phase 60 hertz system that pollutes US society.
It has no neutral conductor, so is considered kind of dangerous by us
purists. It should be protected by dual pole circuit breakers at all
times, but you can guess correctly that it rarely is in practice. In fact the power supply poles here do not have any circuit protection at all - no breakers, no earth leakage devices at all - yoiks. So the
boat yard provides the AC unit to sit on the deck, a fiberglass housing
to direct the cool air down below and the necessary 220v / 60hz
cabling. That's cord number three, keeping us cool while out of the water, but definitely not plugged into the boat thank you very much.