1. Power Systems DC Disconnects & Junction Boxes

2. Functions Overcurrent protection Solar Charge Controller PV Disconnect Solar Charge Controller Battery Disconnect Shunt location for system monitoring Junction for conductors DC Load center Mounting Location for Charge Controller

3. Ananda Power Center 1990

4. Heliotrope Solpan 30

5. Trace or Xantrex DC250

6. OutBack Power Systems Flexware PSDC Integration Hardware

7. MidNite Solar E-Panel

10. MidNite Mini-DC Disconnect

11. Magnum E-Panels

12. Xantrex XW System http://www.xantrex.com/support/xwsizing/disclaimer.aspx

13. Components

14. Circuit Breakers DC rated circuit breakers for source circuits & Inverter/battery Ground-Fault Detection & Interruption System

15. Tri Metric Meter

18. Sizing Inverter Cables & Breakers Identify Maximum AC Inverter output wattage Identify Inverter efficiency Determine Maximum DC watts by dividing Max AC Inverter power rating by Inverter efficiency to get maximum DC wattage Divide maximum DC wattage by lowest voltage the inverter will operate at to get maximum amerage Divide maximum amperage by.80 to avoid exposing conductors to anymore than 80% of rated ampacity Select conductor with ampacity greater than amps calculated Select breaker with ampacity less than maximum ampacity of conductor selected and greater than maximum calculated amps

19. Inverter Efficiency (Exeltech)

20. Exeltech Inverter Specs

21. Example for 12 Volt – 1100 Watt Exeltech 1100 watts/.85 (efficiency) = 1294 DC watts 1294 DC watts / 10.4 volts (cut-off voltage) = 124 amps 124 amps/.80 = 155 amps 2/0 THW in conduit has ampacity of 175 amps Need DC rated breaker between 155 & 175 amps 2/0 & 175 amp breaker