How to wire a tiny house? This tool solves the biggest headache for DIY electrical work: “Do I need 30 Amp or 50 Amp service?”
It allows users to select their specific appliances (Induction cooktop? Electric tankless water heater? Mini-split?) and instantly visualizes whether a standard 30A RV plug can handle it, or if they need a 50A Split-Phase setup. It also includes a “Wire Gauge Cheat Sheet” to prevent fire hazards from undersized wires.
Tiny House Electrical Planner
30 Amp vs. 50 Amp Calculator & Wire Sizing Guide.
1. Select Appliances
Main Breaker Panel
Recommended Service
—
Select appliances to begin.
Load Usage
0%
Wire Gauge Cheat Sheet
| Circuit Type | Amps | Wire (Romex) | Use Case |
|---|---|---|---|
| Lighting / General | 15A | 14/2 (White) | LED lights, bedroom outlets, fans. |
| Kitchen / Bath | 20A | 12/2 (Yellow) | Countertop appliances, hair dryers, heaters. |
| Major Appliance | 30A | 10/2 (Orange) | RV Plug, Electric Water Heater, Dryer. |
| Main Service (50A) | 50A | 6/3 (Black) | Main power cord (4 wires: Hot, Hot, Neu, Gnd). |
The 50 Amp Myth: A “50 Amp RV Service” is actually 100 Amps total (Two 120V legs @ 50A each = 12,000 Watts). A “30 Amp RV Service” is only one leg (3,600 Watts). It is a HUGE jump in power capacity.