| What it does | Independent calculator to check if a home battery pays for itself in your situation
| Free Coast FIRE calculator to track your progress toward financial independence
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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
| Freemium
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| Pricing | Not given
| Free plan with 90-day trial: up to 20 accounts, 3 months snapshot history, multi-currency support, advanced charts, data export. Premium Monthly: $6/month with unlimited accounts and unlimited snapshot history. Premium Yearly: $59.99/year with all features unlocked.
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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
| - Coast FIRE calculator
- FIRE number calculator
- Progress tracking over time
- What-if scenario testing
- Multi-currency support
- Advanced charts and analytics
- Data export in JSON and CSV
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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
| - Organizes multiple real account types to match actual portfolio structure
- No signup required to run calculator; optional account for saving progress
- Immediate what-if analysis without reentering data
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| Community votes | 0 | 0 |
| DR (Domain Rating by Ahrefs) | 17 ▲ +2 (up) since last check | 9 ● no change since last check |
| Trust Flow (Majestic) | 18 | 0 |
| Citation Flow (Majestic) | 24 | 18 |
| Referring domains (Majestic) | 18 | 10 |