| What it does | Independent calculator to check if a home battery pays for itself in your situation
| Free Coast FIRE calculator to estimate your retirement savings milestone
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| Stage | Not given
| Startup
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| Founded | Not given
| 2026
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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
| - Calculate invested assets needed today for Coast FIRE milestone
- Interactive calculator with real-time updates as you edit inputs
- Compare multiple contribution scenarios with projected retirement assets
- Explore return assumptions with sensitivity analysis
- Five related FIRE calculators: Coast, Barista, Fat, Lean, and FIRE Number
- Customize metro area budget or enter your own annual spending
- Transparent formulas and documented verification checks
- All calculations performed in browser with no data uploads
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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
| - Free with no account required and calculations run entirely in your browser
- Transparent assumptions with linked original research and sources
- Deterministic scenarios and educational model focused on inspection and understanding
- Multiple complementary calculators for different retirement planning questions
- Public correction process and documented model updates
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 16 ● no change since last check | 6 ● no change since last check |
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| Trust Flow (Majestic) | 18 | 10 |
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| Citation Flow (Majestic) | 24 | 20 |
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| Referring domains (Majestic) | 18 | 12 |
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