| What it does | Independent calculator to check if a home battery pays for itself in your situation
| Measure rooms and plan DIY flooring projects with feet, inches and metric units
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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
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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
| - Calculate area in feet, inches, decimal feet, meters and centimeters
- Support for rectangular, L-shaped, circular and triangular rooms
- Add up to 20 rooms together
- Automatic unit conversion between feet, inches and metric
- Flooring calculator for waste allowance and whole-box rounding
- Handles closets, alcoves and cutouts
- View formulas and assumptions
- No account required
- Fractional inches support
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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
| - Correctly handles feet and inches together without requiring manual conversion
- Includes measuring diagram for L-shaped rooms
- Explains the difference between measured area, waste allowance and whole-box rounding
- Calculations stay private in your browser with no account needed
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 17 ▲ +2 (up) since last check | 14 ● no change since last check |
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| Trust Flow (Majestic) | 18 | 7 |
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| Citation Flow (Majestic) | 24 | 16 |
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| Referring domains (Majestic) | 18 | 23 |
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Square Footage Calculator