Battery Longevity, Oversizing & DoD: The Zero-Swap Guide (2026)
Empirical degradation physics, Wöhler power-law cycle models, and sizing strategies for LFP, Sodium-ion, and AGM. Learn how oversizing and DoD control eliminate battery replacements.
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🌐 Worldwide Reference Guides
Solar & Battery Benchmarks for 66 Cities
Explore regional solar yield bands, seasonal irradiance, and worked sizing examples for 66 benchmark cities worldwide. (Note: our interactive estimator calculates for any coordinates worldwide.)
Explore more tools: Global Payback Heatmap · About the Sizing Method
Escape Load Shedding With Solar: Backup Sizes (2026)
Essential-load sizing, backup size table, and staged path from small backup to bill-cut to off-grid. Free estimate.
Solar vs Generator Running Cost: Honest Fuel Math (2026)
Fuel $/kWh at $1-2/L vs solar+battery LCOE, with worked Lagos and Beirut 10 kWh/day examples. Free tool.
Battery Bank Sizing Calculator: Off-Grid Guide (2026)
Usable vs nominal, series vs parallel, voltage choice, and worked 10 kWh/day Ah math at 48V. Free simulation.
What Size Solar System for Off-Grid? Honest Guide (2026)
Reliability tiers, latitude yield bands, and PV plus battery ranges for 10 kWh per day. Free simulation.
Time-of-Use Battery Savings: Dodge Peak Prices (2026)
Peak vs off-peak arbitrage math, 2 kWh shifting example, and battery sizing table. Free tool.
Is a Home Battery Worth It? Honest Payback Math (2026)
LFP vs sodium-ion vs lead-acid lifetime cost with Honolulu and Germany examples. Free simulation.
How to Cut Your Electricity Bill With Solar: Honest Math (2026)
How much of your bill solar and battery can actually erase — worked step by step for Honolulu, Lagos, and Germany from five years of satellite weather. Free calculator included.
Off-Grid vs Grid-Tied Solar: Which Pays Back Faster in 2026?
Real payback numbers for Hawaii, Nigeria, and Germany — worked step by step from five years of satellite weather. When independence wins, when bill-cutting wins, and what the hardware truly costs.
DIY Battery Storage: The Complete Guide to LiFePO4 and Sodium-Ion Builds in 2026
Compare DIY battery storage options for LiFePO4 and sodium-ion. Learn cost, safety, and modularity benefits of building your own off-grid or backup system.