How Long Will a 400Ah Battery Last?
A practical method to estimate runtime with real SOC limits and inverter losses.
Off-Grid Planner by Watt & Water
Off-Grid Power Guides
Practical planning guides focused on runtime, charging strategy, and realistic daily energy budgeting.
Lead vs Lithium Runtime Comparison
Where lithium gains come from and where lead can still be viable.
Solar vs Engine Charging
When each source works best and how to avoid daily SOC drift.
Narrowboat Daily Power Usage Guide
Typical load patterns and a simple way to build a realistic daily budget.
Inverter Efficiency Explained
Why AC loads consume more battery energy than their device rating suggests.