If you’re shopping for a home battery in 2025, two names rise above the crowd: Sigenergy and Tesla.
Both deliver reliable storage, whole-home backup, sleek apps, and impressive smart-tariff optimisation - but they achieve those results in very different ways.
Tesla prioritises simplicity, software-driven performance, and rock-solid reliability. It’s the kind of refined, tightly integrated ecosystem that will feel instantly familiar to anyone who loves products that “just work.”
Sigenergy takes a different route, focusing on flexibility, hybrid efficiency, installer-friendly engineering, and long-term expandability. Their latest Home Pro and SPF Gateway redesigns show just how aggressively they’re aiming for the top spot in the market.
This comparison looks at Sigenergy Home Pro + SPF Gateway vs Tesla Powerwall 3, built on Heatable’s real-world installation experience - including detailed performance insights gathered during our own hands-on testing of the Powerwall 3.
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Tesla Powerwall 3: What It Actually Offers in 2025
Before comparing it with Sigenergy, it’s worth understanding what the Powerwall 3 brings to the table - because Tesla has made the PW3 far more capable and flexible than previous generations.
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A Single Unit That Adapts to Your Home
One of Tesla’s biggest advantages is that the Powerwall 3 doesn’t need separate models for different jobs.
The inverter mode is entirely software-defined, which means a single unit can deliver anything from 3.68kW to 11.04kW of discharge power.
No hybrid vs AC-coupled confusion, no multiple SKUs - just one box that can be tuned to your property and grid connection.
Charging performance is equally strong at 5kW per unit, and because the system is fully G100-compliant, it can automatically limit export whenever your DNO requires it.
If the grid tells you “maximum 3kW export,” the Powerwall will simply adjust without needing extra hardware.
Simple, Fixed Storage That Always Delivers 100% Usable Capacity
Tesla keeps storage beautifully straightforward:
13.5kWh usable per Powerwall
Always 100% accessible
Add up to three expansion packs to each Powerwall
Install up to four Powerwalls in a single home
For many UK homes, the sweet spot is one Powerwall plus one expansion pack - 27kWh usable - giving a full day or more of usable energy during outages or high-tariff periods.
Gateway Optional - But Still the Smart Choice
In late 2025, Tesla introduced the option to run a Powerwall without a gateway, using the Tesla Power Meter instead. It works - but most homeowners still opt for the gateway because that’s what unlocks:
seamless whole-home backup
automatic isolation during power cuts
real-time monitoring and load management
If you do choose a gateway, Tesla has a couple of placement rules:
The Powerwall must sit within 45m of the gateway
The gateway must be within 3m of the incoming supply
Accessories and App Integration
One of Tesla’s strongest selling points is how well everything works together.
The ecosystem is intentionally closed - but the benefit is a level of polish and automation that few competitors can match.
In the Tesla app, you can monitor:
the Tesla Wall Connector EV charger
third-party solar (including FIT systems)
generators
even a small wind turbine
The app treats the home like a complete system, constantly analysing consumption, solar export, battery state, EV charging, and grid price signals to optimise energy flow.
Cost and Value
Tesla sits firmly at the premium end of the market. Typical UK trade pricing (excluding install) looks like:
Powerwall 3: ~£6,000
Gateway: ~£1,000
Expansion pack: ~£4,700
Because installers must be Tesla-approved, installation tends to be pricier than with open-ecosystem brands.
That said, the build quality and long-term reliability are genuinely best-in-class, and that premium is reflected in customer satisfaction and system longevity.
Sigenergy vs Tesla Powerwall 3: Head-to-Head Comparison
With the basics covered, here’s how the Tesla Powerwall 3 stacks up against Sigenergy’s Home Pro + SPF Gateway, using real-world installation experience and hands-on testing.
Design & Build Quality
Tesla
Tesla’s design philosophy is unmistakable: smooth, minimal, premium.
The Powerwall 3 packs its inverter and battery into a single monolithic enclosure, hiding cable runs and wiring behind a clean, modern façade.
It looks like a high-end appliance rather than a piece of electrical gear - and that’s very intentional.
Sigenergy
Sigenergy leans into a more engineered, modular aesthetic.
The latest Home Pro redesign significantly improves weather protection, internal layout, and cable management compared to the older HomeMax.
Installers consistently comment that it now feels purpose-built for real homes rather than lab-perfect environments. Everything is laid out logically, serviceable, and safe.
Verdict:
Draw.
Tesla leads on “Apple-like” polish.
Sigenergy leads on robust, installer-focused engineering.
Power & Inverter Performance
Tesla Powerwall 3
Tesla’s biggest advantage is its software-defined inverter. A single unit can deliver anything from 3.68kW up to 11.04kW of discharge simply through configuration - no alternative models, no compromises.
Charging sits at 5kW, and full G100 compliance means export limiting works automatically without extra hardware. For UK homeowners dealing with grid constraints, this is a major win.
Sigenergy Home Pro
Sigenergy uses a high-performance hybrid inverter capable of strong surge output, excellent off-grid operation, and highly efficient PV + battery integration.
Their Smart Port and integrated bypass switch are major differentiators, giving you load control and safety features Tesla doesn’t match.
Verdict:
Tesla wins on discharge flexibility and clever grid-integration.
Sigenergy wins on hybrid capability and real-world performance in more complex systems.
Storage & Expansion
Tesla
Tesla keeps storage simple: every unit is 13.5kWh usable, and you always get 100% of it.
You can add up to three expansion packs per Powerwall and install up to four full Powerwalls in one property.
The downside is that you’re locked into fixed 13.5kWh increments - efficient, but not customisable.
Sigenergy
Sigenergy offers multiple battery sizes, allowing much more granular system design for both small and large homes.
Their modular approach is one of their defining strengths, especially for installers building bespoke systems.
Verdict:
Sigenergy wins on flexibility.
Tesla wins on simplicity.
Backup Power & Gateways
Tesla
The Powerwall 3 can now operate without a gateway by using the Tesla Power Meter, but whole-home backup still requires the gateway.
Tesla’s gateway is proven, stable, tightly integrated with the app - but it lacks the advanced load control and serviceability features Sigenergy includes as standard.
Sigenergy
The SPF Gateway is one of Sigenergy’s strongest selling points. The latest version includes:
improved weather protection
a far cleaner and safer internal layout
an integrated, hot-swappable bypass
multi-brand compatibility (SolarEdge, Growatt, etc.)
installer-friendly routing and labelling
It’s built for real-world British weather, real installer workflows, and long-term reliability.
Verdict:
Sigenergy wins comfortably.
Smart Controls & App Experience
Tesla
Tesla’s app remains the benchmark for clarity and polish. You get:
beautiful real-time visualisations
full views of PV, consumption, import, and export
deep integration with the Tesla Wall Connector
third-party monitoring via the Power Meter
fast, frequent software updates
The Powerwall’s tariff-shifting behaviour and grid-compliance automation are some of the best in the industry.
Sigenergy
Sigenergy’s app excels for hybrid setups, mixed-brand systems, and advanced load control. Engineers love the level of detail; power users appreciate the Smart Port automations.
Verdict:
Tesla for simplicity and elegance.
Sigenergy for advanced control and hybrid detail.
Cost & Value
Tesla
The Powerwall sits at the premium end of the market. Typical hardware pricing:
£6,000 for the Powerwall 3
~£1,000 for the gateway
~£4,700 for each expansion pack
Installation costs also tend to be higher due to the Tesla-approved installer requirement. Tesla wins on long-term reliability and resale value, not on cost per kWh.
Sigenergy
Sigenergy typically works out cheaper per usable kWh, especially when you factor in gateway capabilities, mixed-brand compatibility, and system customisation.
For homeowners wanting maximum value without sacrificing performance, Sigenergy stands out.
Verdict:
Sigenergy offers better value overall.
Comparison Table: Sigenergy vs Tesla Powerwall 3 (2025)
Feature | Tesla Powerwall 3 | Sigenergy Home Pro + SPF Gateway |
Usable Capacity | 13.5kWh per unit | Multiple sizes available |
Expansion | Up to 3 expansion packs | Highly modular, multi-size |
Inverter | Software-defined (3.68–11.04kW) | Dedicated hybrid inverter |
Charge Power | 5kW | Varies, excellent hybrid performance |
G100 Export Limiting | Built-in | Via gateway / inverter |
Whole-Home Backup | Yes (gateway recommended) | Yes, with advanced bypass |
Gateway Required? | Optional (meter only) | Yes, but extremely capable |
EV Charger Integration | Tesla Wall Connector | Third-party friendly |
App Controls | Industry-leading | Highly detailed, advanced |
Brand Perception | Premium, ultra-reliable | Fast-growing, flexible |
Cost | Higher | Lower per kWh |
Best For | Simplicity, brand trust, app | Flexibility, hybrid setups, installers |
Which Should You Choose?
Choosing between Sigenergy and Tesla isn’t about finding a universal winner - it’s about matching the system to the type of homeowner you are.
If you prefer something that just works, the Tesla Powerwall 3 is the clear choice.
It delivers a beautifully simple experience: premium build quality, seamless software, effortless tariff shifting, and one of the most intuitive energy apps ever made.
Everything is tightly integrated, polished, and designed to run quietly in the background. For many households, especially those wanting a low-maintenance, premium system, the appeal is undeniable.
Sigenergy, on the other hand, is built for people who want flexibility and control. The Home Pro + SPF Gateway is designed around real homes, complex systems, and future expansion.
You get advanced gateway features, the ability to work with multiple brands, more size options, and a cost-per-kWh advantage.
It’s especially compelling for larger properties, hybrid systems, or anyone who wants a fully custom energy setup that can evolve over time.
Final Verdict
There’s no outright winner - just two exceptional products aimed at different priorities.
Tesla wins on simplicity, reliability, and app experience. It sets the benchmark for homeowners who want premium battery storage without the complexity.
Sigenergy wins on engineering, flexibility, and gateway intelligence. It’s the smarter choice for hybrid systems and homes that need more customisation, more control, or more expansion.
If your goal is “battery storage, but elevated,” the Powerwall 3 delivers exactly that.
If your goal is “the most flexible hybrid battery system with room to grow,” Sigenergy is the one to beat.
Next Steps For Your Battery Journey:
When planning to install battery storage for your home, there are several important factors to consider. Make sure to refer to the following guides to help you make informed decisions:
To dive deeper into these topics, head over to our advice section, check out our YouTube channel for informative videos, or read a customer case study to see how others have benefited from their battery installation.
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