| What it does | Independent calculator to check if a home battery pays for itself in your situation
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| Based in | NL
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| Pricing model | Free
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| Pricing | Not given
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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
| - Bra size calculation in five sizing systems: US, UK, EU, FR and AU
- Support for inches and centimetres
- Fabric yardage calculator for various projects
- Pregnancy due date calculator using Naegele's rule
- All calculations run privately in browser with no data storage
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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 26 calculators completely free with no sign-up or limits
- Calculations verified with automated tests before every release
- Fully private with no measurements sent to servers or stored
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| Community votes | 0 | 0 |
| DR (Domain Rating by Ahrefs) | 17 ▲ +2 (up) since last check | 3 ● no change since last check |
| Trust Flow (Majestic) | 18 | 0 |
| Citation Flow (Majestic) | 24 | 0 |
| Referring domains (Majestic) | 18 | 0 |