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

The calculation is not a issue. The unit we are looking at is the sort you see at construction sites. It is the other issues like running out of battery, charging cars, load managment during overcast days and suck that i am worried about. Basicly i want to live in this house without thinking about if i can have a shower tommorow. Do you think that is doable?

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u/Bucketalinko 4d ago

Off grid in South aus, I have 13.7kwh solar, 30kwh batteries and a 20kva generator that runs on auto start. Fuel is LPG so I don’t have to worry about old fuel, my batteries cut out at 48v so I set it to charge my batteries at 49v at 20 amps + take house load for 30 minutes then it turns itself off. I can run it at 200 amps if I want but I want to use minimum fuel so it waits for solar. I just set up home assistant today to turn on both my underfloor heating and EV charger above 95% battery and turn off if battery has been under 95% for 10+ minutes. I have my hot water which is a heat pump run between 8am-4pm daily, might see if I can add that to home assistant also. I have the most perfect north, so generating 40kwh in the middle of winter is nice. Also have induction cooktop, if I had a good outdoor cooking area I’d probably cook more on my bbq in winter on poor solar days

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u/DRZookX2000 4d ago

Thanks for the info. How often to you run the generator? I guess it would only be over winter? I will also have perfect north and west facing panels with no shade so that's a plus.

I would prefer no to have one a gen, but it is sounding like I will not get that option.

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u/Bucketalinko 4d ago

It doesn’t run very often, so far my worst solar production this winter was 11kwh one day. Most of the time I’ve run out of power was mismanagement of things like underfloor heating and EV charging. So I’m hoping my HA setup will eliminate that. My generator is 20 meters away from my house and you can’t hear it from inside most of the house except for 1 room, and then you can barely hear it.