Field reference
Size it, install it, explain it.
Eight calculators, three install procedures, cross-brand fault codes, and the component knowledge to defend every number. Works with no signal.
Most used
String Sizing (Voc Temp Correction)
Max & min modules per string for record low / hot day
Battery Bank Sizing
Days of autonomy → usable kWh and Ah
Voltage Drop & Wire Size
Smallest conductor that holds your drop target
Conductor & OCPD Sizing
PV source, battery, and inverter output circuits
All 8 calculators →
From Taddy Digest
This app is the field companion to the solar videos on my channel. Watch the builds, the teardowns, and the real installs — then bring the numbers here.
Partner dealcode as of Oct 16, 2026
$50 off at Signature Solar
EG4 inverters, batteries, solar panels, complete kits, and EG4 mini splits. Tap Shop and the code is copied for you — paste it at checkout.
How to use it →