The out and back nature of electrical circuits has already been included. These are one-way distances, measured from point A to point B. All distances are in FEETĭo not use any wire sizes that might fall into the red zone - this would exceed the amperage rating of the wire and it may overheat and burn. Make sure the insulation is rated for 600 volts, and that there is no damage to the wire or insulation. HOWEVER - you will have to be more careful about selecting and installing the wiring - high voltage DC is not something you want to do a 2nd rate wiring job on. Generally in these systems loss in wire is nothing to worry about. Some of the newer grid tie systems inverters, such as the Sunny Boy, use up to 600 volts DC. Wire can get expensive, and it may not be worth the money to get that last 1% if you have to go to a much larger wire size. Using a heavier wire than indicated, however, will result in even higher efficiencies and we do sometimes invest in the next larger gauge. Use the charts below to determine the correct wire gauge, based on the amount. This method ensures that wire losses are kept to an acceptable level without spending too much money on extra-heavy cable. At the top of the column find the gauge of wire (#6) that should be used. The resistance of the wires is often measured and given as length-specific resistance, normally in the unit of ohms per kilometer or ohms per 1000 feet. R: the resistance of the wires, measured in ohms. where: I: the current through the wire, measured in amperes. In the far left column find the next number higher than 9 (which is 10) and follow that line across the table until you find a distance figure greater than 88. Ohms Law is a very basic law for calculating voltage drop: V drop I·R. These distances include the NEC requirement for current oversizing of 25%.Įxample: For a pump drawing 9 amperes at 24 volts, located 88 feet from the battery bank: look at the center table for 24 volts. For 240 volt 5% loss, double the 120-volt distances. For distances at 48 volts, double the 24-volt distances for a 5 percent loss figure. For a 10% loss multiply the distance by 2. Five percent is normally acceptable in low voltage systems, but if you want a 2% figure, divide the given distances by 2.5. This is a five percent table which means at these amperage ratings at the listed distances, 5% of the power would be lost to resistance. Includes 12, 24, and 120-volt charts and a metric to AWG size conversion table. What Gauge AWG Wire to Use for Solar Electric Systems
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