What the bundle is
The bundle pairs a solar installation with a Tesla Powerwall 3 home battery, installed by BOXT, which describes itself as a Tesla Energy Premium Installer. It is sold on monthly finance. For the other ways to buy a Powerwall through BOXT, see our Boxt Tesla Powerwall guide.
What to check in the terms
- Total cost. Add the deposit to all the monthly payments. The headline monthly figure is not the whole cost.
- Interest, term and final payment. Check the interest rate, how long the agreement runs, and whether anything is due at the end.
- Eligibility. Check whether the headline price is limited to particular customers.
- Ownership. Check when the equipment becomes yours.
- The solar price on its own. Ask for the solar part to be priced separately so you can judge it.
How solar performs once a battery is already there
This is the part that gets glossed over in most coverage of bundled solar and battery offers. The marginal value of solar on top of a battery on a smart tariff is much smaller than the value of solar on its own. Solar generation displaces electricity you would otherwise import. On a flat tariff, displacing a kWh of import saves your full unit rate. On Octopus Go with a battery, displacing a kWh of overnight import only saves the 9.4p per kWh you were going to pay overnight anyway, against a 35.3p to 39.3p day rate (checked 15 October 2026).
So stacking solar on top of a battery adds less than the same panels would add on their own. How much depends on your roof, your usage and your export tariff. Our battery vs solar panels comparison works the same arithmetic through in more detail.
How it compares with a battery-only option
For most homes that just want the time-of-use savings, the comparison that matters is bundle vs battery-only. Habo Energy's 5 kWh EcoFlow STREAM is a fixed, all-in price from £2,499 with an electrician hardwire (G98 / BS 7671), and saves up to about £450 to £530 a year on Octopus Go in the best case (see how we worked it out). Compare that with the total cost of your bundle quote and what the bundle would save you. A larger battery shifts more only if your household uses that much electricity outside the cheap window.
Who the bundle genuinely suits
Stronger fit: households with a south or south-west facing roof and little shading, a stable address for the length of the finance term, and a clear preference for a single turnkey supplier and a fixed monthly payment. Households still on a flat tariff and not yet ready to move to Octopus Go.
Weaker fit: flat owners and tenants with no roof access (the flat battery guide covers what does work). Households whose roof is shaded, north-facing or too small. Anyone who is already on Octopus Go, Cosy or Intelligent Octopus Go and just wants the battery savings. If you want other ways to pay, see our home battery finance guide.
The bottom line
A bundle on monthly finance can solve a real cash-flow problem, but it does not change the underlying economics. On a smart tariff the battery is doing most of the work, and solar layered on top adds less. Add up the total cost of any quote, ask for the solar priced separately, and compare it with a battery-only install. A 5 kWh battery saves up to about £450 to £530 a year on Octopus Go in the best case, regardless of how it is paid for.
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Skip the bundle, keep the savings
Habo Energy installs a 5 kWh EcoFlow STREAM home battery from £2,499, electrician-wired for use on Octopus Go and other UK smart tariffs. Different size to a Powerwall: best case up to about £450 to £530 a year on Octopus Go, payback about 4.7 to 5.5 years (see how we worked it out).
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