Sungoldpower dual 8kw split phase inverters and 16kw battery for sale

Bit of an unusual listing for this forum — split phase is pretty niche over here given we're 230V single phase by default. That kit's clearly specced for the US market (120/240V split phase). Would need some serious rewiring gymnastics to make it useful in a UK setup, if it's even feasible at all.

The 16kWh battery is the more interesting bit depending on what cells are inside. If it's LFP chemistry it could be worth a look for someone with a large static installation, but Sungoldpower isn't exactly a brand I'd stake my narrowboat system on. Fogstar or a quality BYD-based pack would have me sleeping easier.

Also worth noting — 8kW inverters and 16kWh storage is a chunky setup. Are we talking a static off-grid cabin build here? Feels overkill for van or boat use, and the split phase thing just makes it awkward regardless.

Before anyone considers this, I'd want to know:

• Cell manufacturer (CATL? BYD? or mystery brand?)
• BMS specs — comms protocol, balancing behaviour
• Why it's being sold — fault history?
• Age and cycle count on the battery

The inverters being split phase makes them pretty much a write-off for UK residential use in my opinion. Someone exporting to the US or buying for a North American property might find value here, but for typical UK off-grid applications you'd be buying a headache.

Anyone else had experience running Sungoldpower kit? Curious whether the build quality holds up or if it's firmly in the budget-and-you-know-it category.

Yeah @OakSpirit, you've hit the nail on the head there. Split phase 120/240V is essentially a North American standard — you'd struggle to find a practical application for it in the UK without some serious workarounds. Even if someone wanted to repurpose one of those 8kW units as a straight 240V single phase inverter, the internal topology isn't really designed for that, and you'd likely void any warranty fiddling about with it.

Worth flagging for any newer members browsing this thread — don't confuse "240V split phase" with our standard 230V single phase. They're fundamentally different configurations. The seller might have better luck listing on an American-focused forum like diysolarforum.com where there's an actual market for this sort of setup.

What's the asking price out of curiosity? Might be attractive to someone exporting kit or running a US-spec workshop.

Pretty much a non-starter for UK use yeah. Even if you bodged something together, you'd be fighting the kit's whole design philosophy — protection circuits, neutral handling, everything's built around that 120/240V split.

The 16kWh battery side might be more flexible depending on the BMS voltage range, but without knowing the chemistry and comms protocol it's a gamble. Seen a few Sungoldpower units come up secondhand and the support/documentation for UK buyers is basically nonexistent.

If someone's after a chunky battery stack at a decent price it might be worth a look in isolation — but the inverters? Pass. Spend the extra and get a Victron Quattro or Multiplus-II setup that's actually designed for 230V single phase and has proper UK support behind it. False economy otherwise.

@MarineGaz is right that it's a design mismatch, but worth spelling out why for anyone tempted by the price.

Split phase generates two 120V legs with a 240V differential between them — the neutral sits at the midpoint. Our 230V single phase is a completely different topology: one live, one neutral, referenced to earth at the supply transformer. You can't simply "adapt" one to the other without fundamentally redesigning the output stage.

The 16kWh battery stack might be salvageable depending on the battery voltage and BMS comms protocol — if it's 48V with Pylontech-compatible CAN bus, that's potentially usable with a proper Victron Multiplus-II or similar. Worth asking the seller for the battery specs before dismissing the whole lot.

The inverters themselves though — unless you're running a North American workshop or have a very specific industrial application — I'd leave those well alone.

Good points all round. One thing worth adding — even if someone tried to use just one leg of the split phase output to get 120V, you'd then need a transformer to step that up to 230V for UK appliances, which rather defeats the purpose and adds cost, weight, and efficiency losses. And good luck getting any meaningful warranty or technical support from Sungoldpower if you're running their kit outside its intended configuration. @DevonDweller is right that understanding why matters — it's not just a voltage label difference, the whole topology of the inverter is built around that centre-tapped arrangement. Save yourself the headache and find something properly specced for single phase 230V from the outset.

@NeilPowell89 raises a good point about the single-leg workaround — I looked into something similar when sourcing backup kit for the boat, and the short answer is the inverter's protection circuitry and neutral referencing is designed around both legs being balanced. Running one leg unloaded causes all sorts of grief.

Practically speaking, for anyone tempted by the price: Victron Multiplus-II or even a decent Fogstar-compatible 48V inverter will cost more but you're buying something that actually plays nicely with UK grid standards and DNO requirements. The compliance paperwork alone makes it worthwhile if you ever want a G98/G99 notification to stack up properly.

Unless you're shipping this kit to the States or have a genuinely unusual 240V split-phase installation (rare heritage industrial stuff), give it a wide berth regardless of how attractive the price looks.