Heat Pumps
22.10.2025
Learn how this home owner cut their bills by almost £1000/year
Our approach: analyse first, design second
When this customer first approached us, before we talked spec, we needed to understand his actual use energy. For this project we analysed historic usage patterns, existing solar performance and the available tariff options. After careful consideration the team at Pogo then sized the battery bank and inverter power to match typical day time and evening loads and the short off peak periods overnight. The system was designed to charge when electricity is cheapest and discharge when prices spike, reducing daytime grid draw and smoothing bills dramatically.
It’s all in the design – Key differences
Many all in one batteries are limited by lower charge and/or discharge rates. For instance a single Tesla Powerwall 3 has a peak Inverter output of 11kw but a charge rate of only 5kW. Given the demands in the property, our design focus was on both capacity and power, so the home can top up quickly overnight and comfortably run heavier loads without drawing from the grid. For this reason, a high power inverter with limited charge/discharge rates was not acceptable. Low voltage home batteries typically operate at around 50volts, the standard packaged cables (25sqmm) will not carry the current required to run at the inverter’s full power. This meant that the standard cabling and configuration needed an upgrade. Our assessments also showed that a small battery of 10 or 13.5kWh would not provide enough power through the day for a significant portion of the year, this meant increasing storage to more than 20kwh. The SolarImmersion was replaced and configured to follow battery storage so once the battery is at 100%, any surplus solar power is redirected to the hot water storage cylinder. To maximise financial performance the system needed to work in conjunction with the Octopus Go tariff which offers off peak electricity at 7p/unit.
6000kWh/year
18p (day vs night rate)
£1080/year
6.5 years
97.6%
8kW
8kW
Wifi with Sunsynk Connect App
LiFePO4 - Stable, Safe, Efficient
5.12kWh / unit (expandable to 20 units)
20.48kWh
18.4kWh
10 years
Why 8kW Matters
Future ready options
If the homeowner wants even more headroom later, the design allows for additional solar to be added while also keeping the pathway open for expanded storage or new loads.
Installation and compliance
Results you can expect
A strong Tesla Powerwall alternative in Derbyshire
If you’re searching for Tesla Powerwall alternatives, this setup hits the sweet spot for many larger homes:
Get in touch with Pogo Energy now to discuss your requirements.
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Store your energy. Power your home. Stay in control
With a home battery system, you can store low-cost or surplus energy to use when it suits you—like during peak rate times or a power cut. That means lower bills, less reliance on the grid, and more peace of mind. Our battery systems work automatically in the background, making the most of smart tariffs and giving you backup where it counts.
Tailored to You
Standalone or paired with solar panels and a heat pump, every system is custom-built to fit your home and how you use energy. We size it right, install it properly, and set it up to keep your home running smoothly—efficient, reliable, and future-ready.
Let’s build a battery system that works for your home and your lifestyle. Reach out now and we’ll tailor a smart, reliable setup—no pressure, just honest advice and clear savings.
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