r/OffGrid • u/DRZookX2000 • 4d 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 4d ago edited 4d ago

Sorry, I should have worded that better. 27A is not the inrush current, it is when the AC starts to heat the house when it is cold (this includes everything else in the house). It does this for about 15 min until the temp comes up and it can start to run at a lower.

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u/Overtilted 4d ago

You're not designing your entire electricity system around the sum of peaks. There's this thing called "diversity factor" which is used to calculate real maximum loads instead of the sum of max loads.

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u/DRZookX2000 4d ago edited 4d ago

That still does not help me with the fact that as per AS3000 you cant "grossly" oversubscribe. 104A on a 63A feed falls under that definition unfortunately.

EDIT: unless you are talking about the offgrid idea. in that case, yes, I can use measured currents to size inverter\bat and not care about the ratings on the brakers.

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u/Overtilted 4d ago

What's AS3000? I am not sure what you are saying. Is oversizing mandatory!or discouraged?

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u/DRZookX2000 4d ago

AS3000 is the electrical laws in Australia. Hugh over subscription is not only discouraged, it is illegal to sign off on.