Domestic DTU 16 can I run on 220 @ 60htz....

Nigelpickin

Nigelpickin

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www.cornishcottageholidays.co.uk
Hi

Just getting my shore supply converted to accept USA power.
Probably going to use 2 x live wires and bring 30amp 220 into the boat but of course, this will be at 60htz.

Chargers, washing machine, dishwasher, hob all run 50/60 - even the Dometic raw water pumps are rated 50 or 60 thx but the domestic blowers specifically state 50htz.

Will this run the blowers too hard and cause overheat/trip or is it just a label for the EU market....?

I really need the aircon as it’s bloooming warm over here :)

Help please before I make boat go bang!

Many thanks :)
 
Nigelpickin said:
Hi

Just getting my shore supply converted to accept USA power.
Probably going to use 2 x live wires and bring 30amp 220 into the boat but of course, this will be at 60htz.

Chargers, washing machine, dishwasher, hob all run 50/60 - even the Dometic raw water pumps are rated 50 or 60 thx but the domestic blowers specifically state 50htz.

Will this run the blowers too hard and cause overheat/trip or is it just a label for the EU market....?

I really need the aircon as it’s bloooming warm over here :)

Help please before I make boat go bang!

Many thanks :)
Click to expand...

Can you run the blowers (only) off your inverter?
 
jimmy_the_builder said:
Can you run the blowers (only) off your inverter?
Click to expand...

Worth an ask, I think that would call for an upgrade to the inverter, and some new batteries.....

The electrician is calling Dometic to get to see if the blowers will take the 60htz.

Lucky fuel is cheap here as I'm going to run out of money soon....

:)

When are you next Stateside Jimmy?
 
Most induction motors rated for 230v single phase 50 hz will work just fine on a lower voltage, down to ~210v. As frequency increase in a motor so does the ideal voltage, but they have a fair range of tolerance.

In the US they provide a 3 phase 220v phase to phase (UK is 400VAC phase to phase 240v phase to neutral), so any two phases will provide a 220v single phase (please don't ask me to explain why two phases makes a single phase supply). Ideally at 60 hz the voltage to the motor should be higher, but as the same single phase motor will run just fine at 220v 50 hz on European supplies, it will likely be fine on 60 hz too albeit at 220v. Under voltage is less of a an issue with AC than over voltage.

The motors certainly won't go bang so if you can get to the fan casings just check after a few minutes running they are not getting overly warm, but I am sure they will be just fine.
 
Remember that when bringing two phases at 110volt which gives you 220 volt ,that on your on board circuit board ,you are only have circuit breakers protecting one of the phases which means the other phase has no circuit protection ,so take your lights even when they are switched off ,,there will still be 110 volts at light fitting which can kill . Also not sure if your rcd will perform correctly ,,
 
seastoke said:
Remember that when bringing two phases at 110volt which gives you 220 volt ,that on your on board circuit board ,you are only have circuit breakers protecting one of the phases which means the other phase has no circuit protection ,so take your lights even when they are switched off ,,there will still be 110 volts at light fitting which can kill . Also not sure if your rcd will perform correctly ,,
Click to expand...
I think what Seastoke is saying is that you have no neutral, but instead two live cables, albeit at 110v each (actually 127 v). The RCD should work because it is a balance device based upon current in = current out +-30ma, so that should not change, but be careful that you have no false neutrals, or you could cause a phase to ground short circuit. If you have a Neutral reversed indicator this will likely illuminate.
 
seastoke said:
Remember that when bringing two phases at 110volt which gives you 220 volt ,that on your on board circuit board ,you are only have circuit breakers protecting one of the phases which means the other phase has no circuit protection ,so take your lights even when they are switched off ,,there will still be 110 volts at light fitting which can kill . Also not sure if your rcd will perform correctly ,,
Click to expand...

Understood, thanks for the info....
 
Would a transformer be safer than in effect a hot neutral?

I would also assume 3 phase 120v will not be on every dockside?

Re the inverter running the fans the fan draw ( not the ac) will be very low.
 
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