GivEnergy and SigEnergy are the two home battery storage systems we recommend most often at Energy Concerns. Both are superior to the Tesla Powerwall on most specifications — better warranties, better value, and actually available through our UK installer network. But they're different products suited to different households. Here's an honest comparison to help you decide.
The Short Answer
- Choose GivEnergy if you want the best monitoring app, a proven UK track record, and the lowest entry price.
- Choose SigEnergy if you want the highest efficiency, the longest warranty, and integrated EV charging in a single unit.
Warranty: SigEnergy Wins
SigEnergy offers a 15-year product warranty on its SigenStor battery systems — the longest residential battery warranty currently available in the UK. GivEnergy offers a 12-year warranty, which is still three years longer than Tesla Powerwall 3's 10-year warranty.
In practice, both warranties are backed by UK support teams and we've found both manufacturers to be responsive on warranty claims. SigEnergy's 15-year coverage is more meaningful when you consider that solar panels typically warrant 25 years — having your battery last for 15+ years rather than replacing it mid-system lifespan matters for whole-system economics.
Efficiency: SigEnergy Wins
SigEnergy quotes a 97.5% round-trip efficiency for its SigenStor systems. GivEnergy quotes approximately 95%. Tesla Powerwall 3 quotes 90%.
In real-world UK installations, round-trip efficiency affects your annual savings by roughly £30–£80 on a typical 9–10kWh system. It's a genuine advantage for SigEnergy, but not a decisive one for most households.
Monitoring App: GivEnergy Wins (Clearly)
The GivEnergy app is consistently rated the best residential battery monitoring app available in the UK. It provides real-time generation, consumption, battery state, grid import/export, and tariff optimisation in a genuinely intuitive interface. Users can set charging schedules for Octopus Go or Flux overnight charging directly from the app.
The SigEnergy app is good but not at GivEnergy's level. For technically-minded homeowners who want granular control and visibility over their energy system, GivEnergy is the better choice.
Capacity and Modularity: SigEnergy More Flexible
SigEnergy's SigenStor system is modular from 5kWh upward in 5kWh increments, to a maximum of 30kWh. You can start with a 10kWh system and add capacity later as your needs grow (EV adoption, heat pump installation, etc.).
GivEnergy's modular range starts at 2.6kWh and stacks to 18.4kWh. The GivEnergy 9.5kWh is our most commonly installed size and perfectly matches the average UK home's overnight electricity demand.
Integrated EV Charging: SigEnergy Wins
SigEnergy's SigenStor system includes built-in EV charging capability — the inverter can manage EV charging as part of the whole-home energy system without a separate EVSE unit. This is genuinely unique in the UK residential market and makes SigEnergy compelling for households that want a fully integrated solar + battery + EV system from a single manufacturer.
GivEnergy achieves similar integration through third-party EV charger compatibility (particularly Zappi), but requires separate hardware and a slightly more complex installation.
Cost: GivEnergy Wins
A GivEnergy 9.5kWh battery with compatible hybrid inverter is typically £4,500–£6,000 installed. A SigEnergy SigenStor 10kWh with 5kW inverter is typically £6,500–£8,500 installed. The price gap is real and meaningful — GivEnergy offers better value per kWh of storage for households that don't specifically need SigEnergy's unique features.
Which Should You Choose?
GivEnergy is our most common recommendation for UK homeowners who want proven technology, the best monitoring experience, and the best value. The 12-year warranty is more than adequate for most households, and the GivEnergy ecosystem of compatible products (EV chargers, heat pump controllers) is mature and well-supported.
SigEnergy is our recommendation for households that want the absolute best specifications — particularly those with or planning to get an EV, where the integrated charging capability creates genuine system-level advantages.
Both are significantly better than Tesla Powerwall 3 on warranty, efficiency (SigEnergy), or cost (GivEnergy) — and both are available now through Energy Concerns' installer network across the East and West Midlands.
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