Sigenergy vs Tesla Powerwall 3
UK 2025 Quick Guide
Fast Verdict
Pick Powerwall 3 if you want a simple, high-power, all-in-one system with an integrated solar inverter, strong backup performance and a polished app. Ideal for whole-home backup on single-phase supplies.
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Pick SigenStor if you want modular capacity, flexible inverter sizing, native 3-phase support, and optional DC EV charging built into the same platform. Great for expandable or more complex homes.
vs
SigenStor
Tesla Powerwall 3
Key Differences
Power Output & Backup
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Powerwall 3: Very high single-phase power (11.04 kW), great for heavy start-up loads.
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SigenStor: Power varies by controller; offers true single- or 3-phase backup, which is rare.
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Capacity & Expansion
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Powerwall 3: Fixed 13.5 kWh units, up to 94.5 kWh total.
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SigenStor: Stackable 5–10 kWh modules and multiple stacks—easier for gradual upgrades.
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Solar Integration
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Powerwall 3: Solar + battery in one box—cleanest option for new installs.
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SigenStor: More flexible MPPT/inverter configurations for complex arrays.
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Phase Compatibility
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Powerwall 3: Single-phase only.
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SigenStor: Designed for both 1- and 3-phase UK homes.
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Ecosystem
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Tesla: Polished app, simple experience.
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Sigenergy: Integrated DC EV charger option for solar-to-EV with fewer conversions.
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Bidirectional EV Charging
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SigenStor: Built-in bidirectional DC EV charging (check car compatibility).
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Powerwall 3: Hardware capable, feature not active in the UK yet.
Which one fits your scenario?
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Intelligent hybrid battery
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Automatic home back-up
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13.5kWh of storage
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11.04kWh discharge rate
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Expandable with Tesla Expansion Pack
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10 year warranty
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Intelligent hybrid battery
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Automatic home back-up
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Modular with stackable units of 6 and 10kWh
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Modular discharge rate
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10 year battery warranty*
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5 year gateway warranty*
*subject to certain restrictions
​10 Year Warranty on Installs...
10 Years on all Parts & Labour*
25 Years for Solar Panel Performance
*excluding iBoost & car chargers & air-conditioning