A followup on my previous comments which were typed on my cell phone
and so getting all of the details down was painful...
Botany Bay is a British built Oyster
55 with a British (mostly European) power system built in 1990. In this time period RCDs (Residual Current
Devices) which trip out at 30ma of imbalance between the neutral and hot were either required or soon to be required. The RCD will trip both the neutral and hot line. Unfortunately the circuit breaker panel is single
pole. So, if the neutral is not close to ground and the boat has shore power applied there is voltage on the neutral bus for the whole boat and specifically that piece of equipment
At some time in the boat's history
in the US neutral was connected to one leg of 240 split phase and hot was connected to the other leg of split phase. An autotransformer was connected between the two legs to provide 120V power and a complicated switching arrangement installed to connect various things to another.
Now enter a 208V dock
in the US, the output of the 120V circuit now drops to 104 which resulted in various issues (not any permanent 120v equipment
As for the European equipment on board:
Air Conditioners: Fans run faster but with less force due to lower voltage
Condenser tends to ice up (may be low refrigerant but it
is both systems so unlikely)
(Gruenart): The compressor
is running faster but may be lugging
a bit, seems happier on 50hz (Generator)
Charger: on 208V the output is significantly less (1997 charger)
Microwave: Works great on 230V 50hz, barely heats water on 208V 60hz
Machine: Motor lugs on 60hz
Rebuilt system this winter as follows:
Input breaker allows selection of one of the following inputs from 240 50A:
Line 1-Neutral (120V)
Line 2-Neutral (120V)
Line 1 - Line 2 (208/230/240V)
This output runs as two lines and a ground to a Victron Automatic Input Adjusting 3.6kva isolation transformer jumpered on the output for 230V
If up to 32A of 120V is applied output is 16A ot 240V
If up to 16A of 240V is applied output is 16A at 240V
If up to 16A of 230V is applied output is 16A at 230V
If up to 16A of 208V is applied output is 16A at 208V
The output of the Isolation transformer runs into two devices:
100A @ 28V Victron Skylla-i Battery
charger (180V - 260V capable)
8KVA Victron Quattro 230V with 200A @ 28V charger
Priority Input: Westerbeke
6kva @ 230V/50hz
Secondary Input: Output of shore power (208V/230V/240V 50/60hz)
Always On Output: Ships 230V Bus 1
Only On when Generator
or Shore available: Ships 230V Bus 2
There is a low voltage control switch in the nav station which enables EITHER the Skylla-I battery charger OR the 8KVA Quattro shore power input
Quattro Inverter is programmed for 230V 50hz, but will accept 200v-250v 50/60hz power. However, this is programmable input limits so I can restrict it to a specific frequency or voltage range.
Thus, if I need to be running 230V 50hz specific equipment and the total load is under about 6kva I can run that off the inverter. If the loads are larger and need 50hz, turning on the generator (which the Quattro will phase match with and support) provides 5kva additional long term so about 11kva of 230V 50hz power so long as the average draw does not exceed the 5kva from the generator as the batteries are being charged when the loads are low but pulled from during peak demand. In addition, in this mode the shore power can feed the battery charger and provide almost 3kva of DC power for a long term average load of as much as 8kva without depleting the batteries.
If 60hz power is acceptable for the equipment being run then the isolation transformer feeds the inverter directly providing 3.6kva of average power which the inverter can supplement to an additional 8kva surge (almost 12kva) and motor starting of almost twice that.
I am planning on a frequency sensing relay on one of the circuits to allow for equipment which REALLY does not like 60hz power but at the moment nothing will be damaged by 60hz.
How is the system working, at this point very well. Finished the primary feed wiring
two weeks ago. The Skylla-I charger is very quick to respond to load changes. When the inverter starts pulling power (as much as 100A) the charger reacts quickly enough that it does not come out of "Storage" mode which is a slightly lower form of "float" mode. (Charger has the traditional "bulk", "Absorption", "Float", and the additional "Storage" modes) and the voltage stays within a tenth of a volt of where it was with no load so long as the charger can keep up.
I am replumbing the raw water
system at the moment and so should have the fridge compressor
and air conditioners up this weekend.
Overall, this system seems to be working well, if anyone has questions about the system I am happy to discuss.
Originally Posted by botanybay
Having much the same problem in reverse (50 hz 230v boat in us marina as a live aboard) I have chased many of these options.
My air conditioner and fridge compressors are rated for 50/60 hz operation but sound happier on 50hz.
I found references
that the 230v wabesto air conditioners are rated for 50/60 operation. There are many more options in 230/240 volt equipment which is multi frequency.
Washer/Dryers and microwaves are notoriously frequency sensitive.
I went with the following
3.6 kva isolation transformer auto input and programmes for 230/240 output.
100 amp 24v charger (skylla-i from victron)
8kva inverter/charger (quattro from victron)
I mostly run into the battery charger and make power from dc