Note that a 24 VDC array can be placed much further from the battery bank than a 12 VDC array of the same size due to the lower current. A 4% to 5% loss is acceptable between batteries and lighting circuits in most cases. Do not exceed 2% drop for wire between PV modules and batteries. If a 4% loss is acceptable then the distance can be doubled. Use this table to determine the maximum distance from power source to load for 2% voltage drop. Wire Loss Tables for 12 VDC and 24 VDC Systems Note that we stock battery-to-inverter cables in #2, 2/0 and 4/0 AWG. Ode below for NEC code requirements when going transformer-less: Please click the Going Transformer-less Electrical Contractor Magazine article by Mark C. Larger cables may be necessary if the distance from the inverter to the battery is greater than 10 feet. Smaller cable sizes can be used if fuse or breaker size is reduced but this can cause problems if the inverter is running near its maximum output wattage. Use this table to decide cable size and fuse or breaker size for common inverter models. Recommended Inverter Cable and Overcurrent Protection National Electrical Code (NEC) allows rounding up cable ampacity to next size standard fuse or breaker.įor ambient temperatures above 30☌ (86☏), multiply the allowable ampacities shown at right by the correction factor listed under the insulation temperature rating below. is not responsible for its accuracy or reliability.The table below shows allowable ampacities of conductors (wires) in conduit, raceway, cable or directly buried, in an ambient temperature of 30☌ (86☏). Multiple Conductor Correction Factorsĭisclaimer: The information shown here has been assembled from sources believed to be reliable, but is not guaranteed by Cooner Wire Co. Multiply the ampacity rating from above by the correction factor listed below to determine the ampacity rating of a conductor in a multi-conductor cable. Lead Wire Current Carrying Capacity (Ampacity) AWG SIZE
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