Off-grid and AC output for non-critical load?

I am planning an off-grid installation where i would like to have separated output lines for critical loads (lights, refrigerator, etc) and non-critical loads (water pump, Water heater, etc).

I would like that inverter only enables non-critical loads when there is enough solar pv production and batteries are full or reached some charge level

Is this possible?

If so, what VE equipment do i need?

Thanks

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shaneyake commented · Apr 25, 2022 at 06:59 PM

Yes, this is possible.

What size inverter do you need? You will most likely want to use a Multiplus-II which has 2 outputs but can you share more details about your system? Battery size, planned Solar, AC PV if you have any, etc.

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Josep morancho shaneyake commented · Apr 26, 2022 at 08:14 AM

There would be 2kw of solar panels plus 2 x 3kw of lithium batteries. Daily consumption of critical loads are around 2kw and non-critical loads (water pump and water heater) have a power of 1'5kw each but they should not start at night or in low battery charge level.

This is an off-grid system as the house is in the middle of the mountain where AC grid does not arrive.

As far as I understand, second multiplus AC output is disconnected if there is not AC grid available but perhaps can work without grid too. How?

Thanks

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