In-depth technical and economic breakdowns for DIY builders, off-grid enthusiasts, and homeowners exploring modern energy storage.
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
Hawaii's DCCA warns about deceptive door-to-door solar sales: false claims about contractors going out of business and fake state free-solar programs. Know your 3-day cancellation right and verification checklist.
Lala, Lowell, and Nolo: what Hawaii's 2026 hurricane season taught us about backup power, critical-load sizing, and the HECO incentive that pays you to need the grid less.
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.
Essential-load sizing, backup size table, and staged path from small backup to bill-cut to off-grid. Free estimate.
Fuel $/kWh at $1-2/L vs solar+battery LCOE, with worked Lagos and Beirut 10 kWh/day examples. Free tool.
Usable vs nominal, series vs parallel, voltage choice, and worked 10 kWh/day Ah math at 48V. Free simulation.
Reliability tiers, latitude yield bands, and PV plus battery ranges for 10 kWh per day. Free simulation.
Peak vs off-peak arbitrage math, 2 kWh shifting example, and battery sizing table. Free tool.
LFP vs sodium-ion vs lead-acid lifetime cost with Honolulu and Germany examples. Free simulation.
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.
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.
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.