| What it does | Independent calculator to check if a home battery pays for itself in your situation
| The useful corner of the internet
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| Stage | Not given
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| Founded | Not given
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| Based in | NL
| GB
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| Pricing model | Free
| Freemium
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| Pricing | Not given
| Free: 3 public tool runs per 24 hours as guest, 10 runs with free account. Premium: £9 per month for unlimited access to all 123 public tools and 20 Premium workflows. Business Starter: £99 per month including everything in Premium plus one hosted custom business tool and one small monthly update. B
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| Key features | - Compares battery models from 23 brands on payback time and net result after 15 years
- Calculates with real hourly EPEX prices for dynamic energy contracts
- Processes the end of net metering from 1 January 2027
- Provides negative buying advice if purchase is not worthwhile
- No account or email required
- Generates 10-page PDF advice report with lowest prices from 11 shops
- Free 22-page PDF handbook about home batteries
- Analyzes consumption and solar generation hour by hour for full year
- Three scenarios: pessimistic, most likely and optimistic outcomes
- Updates prices from 11 online shops every morning automatically
| - VAT calculator
- Mortgage affordability calculator
- Word counter
- Image compressor and resizer
- Date difference calculator
- Strong password generator
- Unit converter
- CSV to JSON converter
- ROI calculator
- Meta tag generator
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| What makes it different | - Truly independent: sells no batteries, has no arrangements with installers, publishes negative buying advice
- No personal data collection: zero signup required, immediate results without email
- Built from personal need: creator did his own calculations after a misleading sales pitch
- Comprehensive research: 384 example households analyzed in 26,112 calculations
- Shows all calculation assumptions: transparent methodology with public data sources
| - All calculations run locally in the browser with no data transfer
- UK-focused defaults with editable assumptions
- Transparent methodology with visible formulas and sense-check results
- Quality checked before release including boundary values and mobile layouts
- Free public tools with optional Premium and Business plans
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 17 ▲ +2 (up) since last check | 2 ● no change since last check |
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| Trust Flow (Majestic) | 18 | 3 |
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| Citation Flow (Majestic) | 24 | 15 |
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| Referring domains (Majestic) | 18 | 3 |
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