Can you actually run a kettle off solar panels or is that just wishful thinking?

Right, so I'm genuinely puzzled about this one. I've got a 5kW array feeding into a Victron Multiplus II setup in my shepherds hut, and I'm constantly being asked by visitors whether I can actually kettle on demand without draining everything.

The thing is, I can — but only under specific conditions, and that's where I suspect most people get unstuck. A standard 2.5kW kettle needs that power immediately, which means you need:

1. Enough instantaneous DC-to-AC inverter capacity (my Multiplus can handle 5kW, so no worries)
2. Either direct solar input at that moment, or enough battery capacity to absorb the draw without voltage sag
3. Realistically, a battery bank sized for it

My setup works because I'm running 10kWh usable lithium, and I only really kettle during peak sun hours when the array's genuinely producing. Even then, if I'm running other loads simultaneously (immersion heater, power tools), it's a juggling act.

What I don't do is try it on cloudy days or near sunset. That's where the "wishful thinking" comes in — people seem to expect their panels to magically produce 2.5kW on a grey Tuesday afternoon.

Has anyone here successfully run kettle duty on a smaller system? I'm curious whether you're compensating with timing, or if you've oversized your inverter significantly. What's your actual setup?

@JYT_Solar - You absolutely can, but it's all about timing and battery state of charge. A kettle's a beast though – typically 2-3kW, so you'd need solid sun and a decent battery bank behind it.

The realistic answer for most folk: yes during peak midday hours with a healthy battery or direct sun, but you'll want to avoid it when your bank's depleted or it's overcast. The Victron will handle the load management brilliantly, but you might find your inverter throttles it a bit if you're pushing the limits.

Worth noting – if you're regularly running kettles, you're eating battery capacity that you might need later. Most off-gridders I know tend to batch their power-hungry tasks around solar peak hours. Not wishful thinking, just practical energy management.

What's your battery capacity looking like?

The kettle question gets asked constantly because it's genuinely the worst load for solar systems – pure resistive, draws 3-5kW instantly, completely indifferent to your available power.

That said, @JYT_Solar with a 5kW array has legitimate options. Direct solar kettle use only works in proper sunlight with zero cloud cover and a decent-sized array pointing dead south. The moment you hit partial shade, you're pulling from battery, which defeats the purpose if you're trying to stay grid-independent.

Your Multiplus II can handle it if your battery bank's properly sized (4-6kWh minimum for comfortable kettle use without draining to dangerous levels). I've got a 4.8kWh LiFePO4 setup in my hut and I'll use the kettle midday during summer, but I'm not pretending it's efficient.

Real solution? Thermal storage. Got a simple immersion heater circuit that dumps excess solar into a 200L tank when you're producing surplus. Kettle takes 5 minutes; the tank takes 3 hours but stores the heat.

Kettles are the heroin of off-grid systems – everyone wants one hit and doesn't care about the consequences. I've got a 3kW array and even I look guilty when mine fires up at midday. The Multiplus II will handle it fine if you've got decent battery state of charge, but you're basically watching your battery % plummet like a stone down a well. Much easier to just accept that kettles are a summer-only luxury and embrace the thermos life like the rest of us grumpy sods. Winter? Might as well ask the sun to do your tax returns.

Mate, the real answer is "yes, but..." I run one off mine without drama because I've got decent battery state of charge and I'm timing it for peak sun. The trick is not doing it at 6am when your batteries are knackered.

That said, @WattEd's spot on – kettles are efficiency killers. I've started using a smaller travel kettle instead, which genuinely makes a difference. Also switched to a slow cooker for most things, which draws way less and doesn't spike your inverter.

The visitors asking probably don't realise they're asking you to briefly pull 3kW from a system designed for steady 500W loads. Totally fair question but slightly mad expectation!

What's your battery capacity looking like? That's usually where the kettle dreams go to die.

The reason everyone asks is because kettles are the canary in the coal mine for an off-grid system. They'll expose every weakness – undersized inverter, dodgy wiring, flat batteries – and do it loudly.

Here's what I've learned in my motorhome: yes, you can run one, but the conditions matter more than the kettle itself. You need:

• Batteries above 80% state of charge (kettles hate voltage sag)
• Inverter rated for the inrush current (a 3kW kettle can pull 4kW+ on startup)
• Decent cable sizing – voltage drop is your enemy here

@LK_Solar's got it right. I can kettle all day in summer when batteries are topped up. In winter? I'm using the camping stove and not looking back.

The real question isn't "can I run a kettle?" – it's "what's the cost to my system reliability?" For most people, that cost isn't worth it.

Yeah, the kettle question is basically the off-grid litmus test, innit.

I can run mine fine when the sun's proper out and batteries are decent, but here's the thing—it's not really about can you, it's about should you. A kettle's pulling 2-3kW for maybe 5 minutes, which tanks your battery state of charge faster than you'd think, especially in winter.

My workaround's been a Fogstar thermal store paired with immersion heating during peak solar hours. Takes longer to heat but spreads the load out. Visitors are always disappointed when I hand them the camping kettle instead of my desktop one, but at least my system doesn't spend all afternoon sulking at 30% charge.

@JYT_Solar with your 5kW array, you've got the capacity—just depends how aggressive you want to be with your battery. What's your battery bank looking like?

@LiFePO4Nerd nailed it with the canary thing. My cabin setup runs a 3kW kettle no bother — but it's the combination that gets people. Kettle plus toaster plus someone plugging in a laptop? That's when the Multiplus starts having opinions 😅

Worth checking your inverter's surge rating as much as the continuous wattage. Had a mate who couldn't figure out why his kept tripping until we realised he had a cheap pure sine wave unit that hated the initial spike.

5kW array you'll be fine honestly, just watch the battery SoC like @LK_Solar says.