How do I choose a power supply?

Work with your sign company where you purchase a SpellBrite sign.  They will be able to calculate the power consumption and recommend what power supply configuration you will need.  A basic rule of thumb is 7 or fewer characters will work fine on a 1 amp AC-DC power supply, 8 – 21 will work fine on a 3 amp AC-DC power supply.  More than 21 letters often require more than one power supply.   To see the power draw of every character you may download the Excel SpellBrite Current Draw and Width 2012-10-01 spreadsheet.