TOOL 01 // AUDIT
Daily Energy Load
Tally appliances across AC and DC circuits with realistic inverter conversion losses (85%) and 24V/48V bus conversions.
Calculate Daily Wh & AhSTANDALONE POWER ENGINEERING
Architect your off-grid solar & battery setup with zero guesswork.
Calculate true daily Watt-Hours accounting for inverter standby loss, size LiFePO4 vs AGM storage by depth of discharge, and size your solar PV array and MPPT charge controller to full NEC standards.
✓ 80% DoD LiFePO4 · ✓ MPPT Buck Conversion · ✓ 12V / 24V / 48V DC Bus
Component Sizing: PV Array Watts · MPPT Amps · LiFePO4 Ah · Inverter Continuous & Surge
Safety Standards: 125% Continuous Duty · ANL Fuse Sizing · Low-Temp LiFePO4 Cutoff
Pure Math: Runs 100% in your browser. No signup, no telemetry, instant URL sharing.
THE CALCULATION SUITE
Precision Off-Grid Tools
Single-purpose, focused tools built to solve each stage of electrical design sequentially or unified in our all-in-one architect.
TOOL 02 // STORAGE
Battery Bank Sizing
Compute nominal and usable capacity in Ah and kWh factoring in cloudy autonomy days and 80% LiFePO4 vs 50% AGM depth-of-discharge.
Size Battery Capacity
TOOL 03 // GENERATION
Solar PV Array & MPPT
Determine required array wattage, 100W/200W/400W panel quantities, and NEC-compliant MPPT charge controller current ratings.
Plan Solar Panels & MPPT
TOOL 04 // ARCHITECT
System Architect
Unified calculation coordinating load tally, battery storage, PV array, pure sine wave inverter wattage, and main DC fuse sizing.
Architect Complete SystemFIELD ENGINEERING NOTES
Off-Grid Electrical Principles
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Electrical Engineering
How to Audit Off-Grid Electrical Loads: Watt-Hours & Phantom Overhead
Why multiplying device wattage by run-hours is only the first step, and how inverter standby draw drains off-grid battery banks.
Battery Storage
LiFePO4 Lithium vs AGM Lead-Acid: Usable Capacity, Cycle Life & Cold Weather
Why a 100Ah LiFePO4 battery delivers nearly double the usable runtime of a 100Ah AGM battery while lasting 5 times longer.
Inverter & Wiring
Pure Sine Wave Inverter Sizing: Continuous Watts, Surge Multipliers & DC Amperage
How to match inverter continuous output and surge ratings to inductive motor loads while sizing safe DC cables and fuses.
Solar Generation
MPPT vs PWM Charge Controllers: Real-World Solar Harvesting & String Sizing
Why MPPT charge controllers harvest up to 30% more solar energy than PWM controllers and how to calculate array string voltages.