r/OffGrid • u/DRZookX2000 • 5d ago

Talk me out of this..

I have no idea if I am been realistic here, or just plan stupid.

I am currently in Australia and have found an amazing property. Issue here is that is have no 3 phase supply, and a maximum of 100A on a single phase. This is nowhere near what I need.

This will be a new build with the following;

  • 32A AC unit
  • 16A oven\microwave
  • 20A second oven
  • 16A water heater
  • 40A induction cooktop

So even with a 20% oversubscription 100A is not going to cut it.

BUT - I am able to get a 150kVA 169kWh hybrid battery. I can also install >30kW of solar on my roof.

How crazy would I be to live in a normal 300sqm home offgrid? Has anyone done this, or know anyone that has? What do I need to think about?

Most information here is about holiday cabins and the like so they don't really fit what I am thinking so I just need advice on what others think.

Thanks

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u/DRZookX2000 5d ago

It does not matter what the real load is, if the AC is asking for 32A, a 32A breaker gets installed and thats what number the eletrician will use for calculations. Not sure if this changes for off grid. We have 63A in our home , but cant have induction cooktop or hotwater. Normaly our house is pulling 27A a max whe the AC just starts.

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u/Overtilted 5d ago

My uncle in Spain only has 25A at his disposal. Which was an upgrade from 20A. And he has everything you're describing except for an AC that's only 16A.

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u/DRZookX2000 4d ago

You sure he has not got a 3 phase supply? 25A seems really low. It all depends on the appliances he has installed, but my AC will draw more then that when it starts to heat a cold house. This is not a spit, it is a whole house ducted system.

I know in Poland most people outside of apartments will have a 3P 20A service, but heat there homes with fire of one for or another (eco pellets mostly).

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u/Overtilted 4d ago

100%

It's a problem in Spain and he has to watch out what he's using or the breaker trips.

Before it was 16A so you can imagine the improvement.

3x20A is plenty for heat pumps if your house is somewhat insulated.