Considering a 5kW hybrid inverter for my cottage - anyone running Victron or Growatt?

I've been through this exact decision myself when I set up my narrowboat system, though I went smaller initially at 3kW. The jump to 5kW is interesting because it's where you start needing proper consideration of your incoming AC supply and installation costs.

I ended up with a Victron MultiPlus after months of deliberation. The build quality is genuinely impressive — German engineering that's built to last, which matters when you're off-grid and can't just ring up your sparky for a replacement. The monitoring through VRM is brilliant too; I can check my battery state from anywhere. Yes, it's pricier, but I've had zero issues in three years.

That said, I've got mates running Growatt on their cottage setups and they're getting on fine. Cheaper upfront, decent performance, though the customer support seems a bit more hit-and-miss depending on your installer. The Growatt SPH series seems to be what most people go for in that power range.

Real question though — what's your use case? Are you looking at this as a grid-tie with battery backup, or genuinely off-grid? And what's your battery capacity? A 5kW inverter makes different sense depending on whether you're backing up a 10kWh system or pushing 30kWh.

Also worth checking whether your cottage electrician is familiar with hybrid installations. Makes a difference to installation complexity and cost. Some areas are absolutely rammed with Victron experience, others less so.

What's drawing you toward 5kW specifically?

Cheers for the detail @HalfAJob. The 5kW sweet spot is where things get properly serious — you're past the "nice to have" phase and into "actually powers the kettle without everything dimming."

I'm running a Victron MultiPlus II 3kW in my static caravan setup and honestly, the build quality is chef's kiss, but blimey the price. That said, I've heard decent things about Growatt's newer hybrid units for the budget-conscious crowd — seems like you're getting 85% of the Victron experience at 60% of the cost.

Real talk though: what's your actual peak demand? Because most people dramatically overestimate it. My garden office + EV trickle charge + kettle never actually hits 5kW simultaneously, yet here I am with the capability.

Size your batteries first, inverter second. Don't do what I did initially.

The 5kW bracket is where you'll genuinely notice the difference between decent and rubbish equipment. I've got a Victron Multiplus II 5000 in my setup and it's been rock solid for three years now—the firmware updates alone keep it relevant.

That said, Growatt's hybrid inverters are considerably cheaper and perform adequately for most scenarios. The trade-off is support and longevity; Victron's documentation is exceptional if things go sideways.

Key consideration: your battery chemistry matters more at this capacity. If you're running LiFePO4, you'll want MPPT controllers that communicate properly with your pack—Victron's BMS integration is seamless here. Growatt requires more manual configuration.

What's your battery situation looking like? That'll genuinely determine whether the extra cost justifies itself.

Got a Victron MultiPlus 5000 in my van conversion and honestly can't fault it. The build quality's just different — yeah it's pricier upfront but the efficiency and reliability means you're not constantly faffing with it.

That said, if budget's tight, Growatt's not rubbish. Know a few people running them without major dramas. Just make sure you've got proper battery-side protection sorted regardless of which you pick.

The real question is your battery capacity and what you're actually running. 5kW sounds good but if you've only got 10kWh usable, you'll be throttling the inverter half the time anyway. What's your battery setup looking like?

ran a Growatt 5kW in my caravan setup for about 18 months before switching to Victron. Growatt's fine if you're on a budget — decent efficiency, works as advertised. but the interface is clunky and support's patchy if things go wrong.

Victron's worth the extra quid. Better integration with batteries, firmware updates actually improve things rather than breaking them, and the monitoring app doesn't feel like it was designed in 2010. The MultiPlus handles input voltage fluctuations better too, which matters if you're relying on solar + genset combo.

Only real downside is Victron pricing. But resale value's solid if you ever upgrade.

what's your battery setup looking like? that'll probably influence which way to lean more than the inverter itself tbh

The real question is whether you've got the battery bank to back it up — I learned that the hard way with my garden office setup. A 5kW inverter on a measly 10kWh battery is like having a Ferrari with a petrol cap the size of a thimble.

Victron's the safe bet if you're not watching every penny, but honestly the Growatt lads aren't wrong either. The difference is more about monitoring and support than raw performance. Victron's got better integration if you're planning to expand later (charge controllers, MPPT, the whole ecosystem thing).

What's your battery situation looking like? That'll actually determine whether 5kW is overkill or sensible.

Cheers for the responses lads. Worth adding that the warranty support is quite different between the two – Victron's got proper UK distributors and you'll get faster turnaround if something goes wrong, whereas Growatt can be a bit hit-or-miss depending on where you buy from.

That said, @ZFS_OffGrid's point about budget is fair. If you're tight on cash, a Growatt will do the job, but factor in potential support headaches down the line.

What's your battery setup looking like? @VoltBarry's spot on – a 5kW inverter is only as good as what's feeding it. If you're running LiFePO4 or quality lead acid, either will work fine. But if your battery bank's undersized, you'll hit limitations regardless of which inverter you choose.

What's the main load you're planning – heating, workshop tools, or just general off-grid living?