CONSIDERED HOME ENERGY TOOLKIT

Home Battery Comparison Tool

Compare up to six home battery systems side by side. Compare the total installed cost, usable storage, power output, warranty, backup options and future expansion to find the best value for your home.

✓ Compare usable, not advertised, capacity✓ Include inverter and unavoidable extras✓ Test whether it can run your real household loads

Comparison tool v9.6 · Updated August 2026 · Release notes

Home batteries outside a solar-powered home

Independent comparison. Choose from curated presets or enter your own quote. Technical figures are taken from manufacturer information; prices are editable UK estimates because installed costs vary by property and installer. Results are mathematical comparisons, not product endorsements or electrical design advice.

1. YOUR HOME

What does the battery need to do?

Energy you want the battery to supply each day Use evening/overnight grid use, not total household consumption.kWh/day Highest power you want it to cover For example kettle + oven + background load.kW Maximum initial budget Leave at zero if you do not want a budget filter.£ Future storage target Used to compare the likely cost and complexity of expansion.usable kWh Expected full-equivalent cycles per day Used to estimate whether a cycle limit or time limit is reached first.cycles/day

2. BATTERIES

Add up to six systems

Use the installed price you would actually pay. Keep optional future expansion out of the initial cost.

Start with a real systemSelect a preset in each card, then overwrite any price or specification with the figures from your own quote.

3. RESULTS

Which battery offers the best value for your home?

Winners update automatically as figures change.

Side-by-side comparison

Sorted by overall fit. Select a column heading to sort by a specific measure.

Battery	Initial cost	Usable	£ / usable kWh	Discharge	Daily need covered	Peak load covered	Backup / EPS	Cost at target	Warranty / lifetime value	Overall fit

Cheapest capacity

Uses the complete initial system cost divided by usable capacity. This includes a required inverter and other unavoidable extras.

Best for your usage

Rewards enough usable energy and discharge power without paying heavily for capacity you are unlikely to use.

Best expanded system

Estimates how many matching expansion modules are needed to reach your future target and includes the entered expansion hardware or installation cost.

Product and warranty status matter

Available

Currently marketed, with warranty terms that can be checked before purchase.

Upcoming

Announced specifications and warranty are provisional until the UK product launches.

Administration / second-hand

The hardware can still be compared, but original manufacturer support and warranty must not be assumed.

4. NO-SOLAR SAVINGS CHECK

Could a battery reduce your bills without solar?

Estimate the value of charging cheaply off peak and using that stored electricity during more expensive hours.

Use a battery from your comparison This copies its usable capacity, installed cost and efficiency. You can still edit the figures below. Annual electricity usekWh/year Usage that can be shifted The share normally bought during expensive hours that the battery could realistically replace.% Usable battery capacitykWh Expected cycles per day One full-equivalent cycle is charging and discharging the full usable capacity.cycles/day Peak electricity ratep/kWh Off-peak charging ratep/kWh Round-trip efficiency% Installed battery cost£

Include optional grid export

This is separate from normal household savings and is not required for the battery to make sense. Export availability, permissions, tariffs and warranty conditions vary.

Energy exported from the battery Annual battery output deliberately sold back to the grid.kWh/year Battery export ratep/kWh

ESTIMATED RESULT

Electricity shifted each yearNot calculatedNot calculated

Estimated annual benefitNot calculatedHousehold shifting only

Simple paybackNot calculatedNot calculated

Approximate bill reductionNot calculatedEnergy charges only; standing charge excluded

This is a simplified tariff-arbitrage estimate for a home with no solar. It assumes the cheap-rate window is long enough to charge the battery, the battery can cover the relevant loads, and the tariff remains available. It does not include standing charges, degradation, finance costs, maintenance or the value of backup power. Optional grid export is only included when enabled above.

SUPPORT CONSIDERED

Help keep useful tools like this free

If this comparison has helped you make a better decision, these are simple ways to support the research, testing and continued development behind Considered.

Ko-fi thank youMake a one-off contribution Octopus referralView the current referral offer Subscribe on YouTubeSee testing and future updates Join the channelSupport through YouTube membership

Referral disclosure: some links may financially benefit Considered. They do not affect the calculator, its assumptions or its results.

How the overall fit score works

The score combines practical suitability, price, expansion, verified warranty value and current product status. Systems in administration or with uncertain warranty backing receive a substantial penalty even when the hardware itself remains useful.

A battery that cannot meet the entered peak load receives a visible warning because capacity alone does not determine whether it can run high-power appliances.

Where does the preset data come from?

Technical specifications are based on manufacturer product pages and datasheets, with a source link shown on each preset. Prices are deliberately labelled as editable estimates because UK quotes vary with inverter choice, gateway, backup wiring, consumer-unit work, DNO requirements and installer margin. Replace the estimate with a real quote before relying on the result.

What should be included in installed cost?

Include the battery, inverter where required, gateway or controller, VAT, normal installation, commissioning, and unavoidable electrical work. Do not include optional future expansion in the initial figure.

Release notes and version history

v9.6 — SEO fixes: the canonical URL incorrectly pointed to `www.considered.uk` while every other page on the site uses the non-www domain, which could have split ranking signal between two URLs for Google. Added the Open Graph and Twitter Card tags and structured data (JSON-LD) this page was missing entirely, so sharing a link now shows a proper preview card, and search engines can show it as a rich result. Trimmed the meta description, which at 174 characters was long enough to get cut off mid-sentence in search results. Bumped the `?v=` cache-busting suffix to 96.

v9.5 — Removed the Topics link from the header nav (Home, Tools, Brand Partnerships), the same change made across all Considered tools. Bumped the `?v=` cache-busting suffix to 95.

v9.4 — Fixed four issues found during a full review of the tool. The savings calculator's optional grid-export benefit was being calculated but never shown on the page — it now appears as its own result card when export is enabled. Saved comparisons stored in the browser were being written but never read back, so reloading the page (or returning later) silently reset everything to the six default systems instead of restoring your own edits — restoring now works as intended, and "Reset all" is properly distinct from a normal reload. The backup-capability column was misreading three upcoming presets (EcoFlow STREAM AC 5000, EcoFlow STREAM 5000, Anker SOLIX Solarbank 4) as offering "Whole-home backup" because their spec text contains that phrase inside a sentence saying they do not provide it automatically — they're now correctly shown as "EPS / dedicated circuits" only. Bumped the `?v=` cache-busting suffix to 94.

v9.3 — Fixed the fit score so an unrealistically expensive system can no longer stay "recommended" no matter how high its price goes. The value component of the score previously stopped counting against a system once its cost per usable kWh passed roughly £3,100 (worth about £42,000 on a Powerwall 3, for example) — above that point, price simply stopped affecting the ranking at all. The score now keeps responding to price with no ceiling on the penalty.

v9.2 — Fixed the "Use a battery from your comparison" dropdown in the savings calculator, which was rendering as a plain white, unstyled control instead of matching the rest of the dark theme. Restored a visible tool version number in the hero, which had gone missing from the page.

v9.1 — Header nav now matches the rest of the site (Home, Topics, Tools, Brand Partnerships); it was previously missing the Brand Partnerships link.

v9 — Compact text-free hero crop, corrected cache versions, and defensive savings-calculator initialisation.

v5.0 — Added the no-solar tariff-arbitrage savings calculator, able to copy usable capacity, efficiency and installed cost from any currently selected comparison system. Added Support Considered cards for Ko-fi, the Octopus referral link, YouTube subscription and YouTube membership.