Start with the load, make the assumptions visible.
These calculators are meant to help you frame a system before choosing hardware. They are not code-compliance certificates or substitutes for equipment-specific design.
Solar & Battery Troubleshooter
Organize existing controller, BMS, inverter and overnight-energy observations without live testing or speculative fault diagnoses.
Battery Runtime Calculator
Estimate usable battery energy and runtime from voltage, capacity, depth of discharge, load and inverter losses.
Solar & Battery Sizing Calculator
Turn a daily energy budget into a planning estimate for solar array size, battery capacity and inverter demand.
Build My Off-Grid System
Choose illustrative appliances, edit daily energy and availability, compare solar balance versus optional reserve recovery, and keep a private planning project.
Winter Solar Survival Simulator
Explore synthetic winter daylight, hourly appliance demand and battery storage through 3, 7 or 14 days. See first unmet demand and why power caps matter.
DC Voltage Drop Calculator
Check DC voltage drop and find a wire gauge using stranded copper or aluminum, metres or feet, and separate preliminary reference screens.
Inverter Idle Power Calculator
Estimate daily and monthly battery energy lost to inverter standby consumption, and compare normal idle operation with supported ECO or search modes.
Transparent enough to check by hand.
Each tool exposes the inputs and assumptions that drive the result. Where a value is only a planning multiplier or typical default, the page says so.
Read our calculation methodology →