GivEnergy Gen 3: An Installer's Honest Review
At ALPS Electrical, we install both Tesla Powerwall and GivEnergy across the North East. We don't have a preferred manufacturer — we recommend what suits each customer. That position means our assessment of GivEnergy Gen 3 comes without any incentive to talk it up beyond its genuine merits.
Here is what we actually think, based on our installation experience across dozens of Gen 3 systems.
What's New in Gen 3
GivEnergy's Gen 3 represents a significant step up from the Gen 2 system. The battery chemistry has moved to LFP (Lithium Iron Phosphate), which is more thermally stable, longer-lived, and performs better in cold temperatures — a practical advantage in the North East. The inverter has been improved for efficiency. Communication between components is more reliable. And critically, the 12-year battery warranty (from 10 years in Gen 2) is now among the best in the sector.
Technical Specifications
- Available capacities: 5.2kWh, 9.5kWh, 13.5kWh (2 x 9.5kWh stackable)
- Inverter output: 5kW or 6kW
- Round-trip efficiency: ~94%
- Warranty: 12 years battery, 10 years inverter
- Operating temperature: -10°C to +50°C
- Backup power: Optional EPS (Emergency Power Supply) module
Monitoring and App Experience
GivEnergy's monitoring portal is comprehensive — arguably more detailed than Tesla's offering for technically-inclined users. You can see live data for solar generation, battery state of charge, grid import/export and home consumption. The scheduling system is highly granular: set different charge/discharge profiles for different tariff periods, seasons, or days of the week. The open API is a genuine advantage for users who want to integrate their battery with home automation systems like Home Assistant.
Performance in Real Installations
Our installations consistently achieve 93–95% round-trip efficiency in real-world conditions. The system handles tariff scheduling reliably — particularly with Octopus Go, where overnight charging to 80–85% and morning discharge is a well-tested combination. Cold winter nights (which are a genuine factor in the North East) have not caused degradation issues in Gen 3 units installed since late 2023.
Installation Experience
The Gen 3 installs cleanly. The inverter and battery are separate units that mount on the wall, offering more flexibility in tight spaces than the larger Tesla unit. Commissioning takes 30–45 minutes and does not depend on manufacturer server availability — a practical advantage that occasionally causes delays during Tesla Powerwall commissioning.
Tariff Optimisation and Scheduling
GivEnergy Gen 3's scheduling system is one of the most flexible in the sector. You can configure separate charge and discharge windows for every hour of every day of the week, with different settings for weekdays versus weekends. For Octopus Go users, the standard setup is: charge to 80–85% overnight (00:30–05:30), discharge during peak hours (16:00–21:00), maintain 20% reserve overnight for morning consumption before the charge window. This profile consistently achieves 90%+ battery utilisation.
For Octopus Flux users, the scheduling becomes slightly more complex — but the GivEnergy portal handles it well. You can also use third-party automation tools like Solar Assistant or Home Assistant to optimise further, taking advantage of GivEnergy's open API. For technically-inclined users, the level of customisation available is genuinely superior to Tesla's more curated experience.
Battery-Only Installations
One underappreciated use case for GivEnergy Gen 3 is battery-only installation — no solar panels. On Octopus Go (7.5p/kWh overnight, ~24p/kWh daytime), a 9.5kWh battery charged overnight and discharged during the day saves approximately £1.50–£1.80 per full cycle. With 300+ full cycles per year, annual savings of £450–£550 are achievable. Payback on the battery alone: 8–12 years. This improves meaningfully on Octopus Intelligent Go (sometimes below 2p/kWh on smart slots) or Octopus Flux (exporting at up to 30p/kWh during peak evening periods).
EPS (Emergency Power Supply)
GivEnergy's optional EPS module provides backup power during grid outages. Unlike the Powerwall 3's whole-home islanding, GivEnergy's EPS is typically configured to power essential circuits only — typically the sockets circuit, lighting, and specific appliances — rather than the entire consumer unit. The switch-over time is approximately 20 milliseconds, sufficient to maintain most electronics and appliances. For homeowners who want backup but don't need whole-home protection, EPS adds approximately £500–£800 to the installation cost.
Long-Term Value
The 12-year battery warranty is GivEnergy's strongest financial argument. At the end of the warranty period, the battery should retain at least 70% of its original capacity — still a functional, useful system. The 10-year inverter warranty means the full system is covered for a decade. Given that the payback period is 7–10 years for most installations, a well-maintained GivEnergy system should provide 5–15 years of savings after payback with no additional capital investment required.
GivEnergy vs Tesla Powerwall 3: Our Honest Take
GivEnergy Gen 3 wins on: price, flexibility, warranty length, open API access, and scalability. Tesla Powerwall 3 wins on: whole-home backup (integrated Backup Gateway), built-in solar inverter (simplifying new installs), app experience, and the Tesla brand ecosystem. For budget-conscious homeowners who don't need whole-home backup, GivEnergy is the stronger choice. For homeowners wanting the premium experience, backup capability, or who are already in the Tesla ecosystem, Powerwall 3 justifies its higher price. Contact us to discuss which system suits your home in the North East.