| What it does | Independent calculator to check if a home battery pays for itself in your situation
| Find the month you can stop saving for retirement
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| Stage | Not given
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| Founded | Not given
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| Based in | NL
| CA
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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
| - Shows the exact month you can stop saving
- Runs 1,000 simulated markets to show odds of success
- What-if scenarios for savings, returns, and fees
- Accounts for investment fees and contribution raises
- Share links to compare plans with others
- No sign-up required
- Calculations run in browser, data not stored
- Shows formulas and assumptions transparently
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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
| - Answers when you can stop saving, not just how much you need
- No sign-up, no data stored, free to use
- Shows odds of success with Monte Carlo simulations
- Plain language explanations without financial jargon or hype
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 17 ▲ +2 (up) since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 18 | 0 |
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| Citation Flow (Majestic) | 24 | 16 |
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| Referring domains (Majestic) | 18 | 2 |
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Eerlijk over Thuisbatterijen
Coast FIRE Planner