Can you run a whole house off a single 5kW solar array or am I dreaming?

Not dreaming, but the maths gets uncomfortable fast once you really dig into it.

I've got a 5kW array feeding my shepherd's hut setup, and I'll be honest—it powers the essentials brilliantly during summer. Heating water, running the fridge, lights, all sorted. Come November though, you're looking at maybe 1-1.5kW on a good day. That's where the battery bank becomes your actual lifeline rather than just a nice-to-have.

The real issue isn't the array size, it's your consumption patterns and seasonal variation. A modern house pulls far more than most people realise—not just the big stuff, but all those things running in the background. My Victron setup logs everything obsessively, and that visibility was eye-opening.

Here's what I reckon works:

• 5kW array handles a modest, deliberately-designed setup (shepherd's hut, smallholding cottage, that sort of scale)
• You need serious battery storage—I'm talking 15-20kWh minimum if you want winter security
• Consumption discipline is non-negotiable (heat pumps are out, resistive heating too, grey water systems instead of hose culture)
• A backup plan for genuinely grim weather (generator, grid tie, whatever suits your situation)

I've seen folks pull it off with smaller arrays by being ruthlessly selective about what they run and when. Others with 10kW systems still run short because they've not scaled their behaviour to match their generation.

What's your setup looking like? Are you off-grid or tied to anything? That changes the conversation entirely.

The maths is indeed brutal. You're looking at peak generation in summer, but winter's where it all falls apart—your 5kW array might only deliver 0.5-1kW equivalent on a grey December afternoon.

What's your battery capacity and usage pattern? That's the real constraint most people underestimate. I ran similar calcs for my van conversion (smaller scale, admittedly) and realised you need roughly 10-15kWh of usable storage to bridge winter shortfalls, plus a backup generator.

The question isn't really "can 5kW do it" but rather "can 5kW + sufficient battery + realistic consumption habits do it." Whole-house demand typically peaks at kettle-boiling moments—that's where you'll hit the wall unless you're running exceptionally efficient appliances.

What's your actual annual usage figure? That'd help determine if you're genuinely dreaming or just need better load management.