Equipment Sizing Tools

Here are some links which contain calculators which can be used to size equipment such as motors, cables, batteries, etc 
Excellent website containing tools for calculating sizes of batteries, cables and other equipment. Site also contains Technical Guides and Reference Data 
Online Electric Motor Calculator 
Voltage Drop and Cable Size Calculator for ELV Solar Power Systems 
Wire Gauge Size Conversions AWG to Metric - Diameter and Cross Sectional Area
Typical Power Consumption Values for domestic appliances 
Online tool for cable and circuit breaker calculation (LV)
Details of Voltage and Frequency used in different countries around the world.  Contains details on plugs and sockets in each country