| What it does | Independent calculator to check if a home battery pays for itself in your situation
| Free grading calculator and printable chart for teachers
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| Stage | Not given
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| Founded | Not given
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| Based in | NL
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| Pricing model | Free
| 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
| - Three grading scales (standard, strict, lenient)
- Printable grading charts
- Half-point deductions
- GPA points column
- CSV export for spreadsheets
- Up to 200 questions
- Offline functionality
- No data collection
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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
| - Instant calculation with no manual math required
- Privacy-first design with no student data storage
- Built specifically for teachers' workflow
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 15 ▼ −1 (down) since last check | 1 ● no change since last check |
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| Trust Flow (Majestic) | 18 | 1 |
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| Citation Flow (Majestic) | 24 | 20 |
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| Referring domains (Majestic) | 18 | 4 |
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Eerlijk over Thuisbatterijen
EZGrader