Use 3% voltage drop for critical applications affecting the safety of your boat and crew, such as running lights, blowers, electronics and panel board feeds. If 7–24 conductors are bundled, reduce amperage by 50 percent. If 4–6 conductors are bundled, reduce maximum amperage by 40 percent. Conductors are not bundled: If three conductors are bundled, reduce maximum amperage by 30 percent.Wires are not run in engine spaces: Maximum current is 15 percent less in engine spaces, which are assumed to be 20☌ hotter than non-engine spaces (50☌ vs.SAE wire sizes are 6 to 12 percent smaller, carry proportionally less current, and have greater resistance AWG wire sizes, not SAE: All Ancor wire uses AWG wire sizes.Lower temperature insulation cannot handle as much current 105☌ insulation rating: All Ancor wire uses 105☌ insulation rating.This simple equation allows you to calculate the voltage drop for a circuit of any length and any current flow, if you know the resistance of the wire.įinally, note that the amp capacity (ampacity) of the wire curtails using very short lengths of wire for large current flows, as shown by the “flat tops” of the 10% chart areas. Voltage Drop = Current x Length x Ohms per foot We’ve included copper wire specifications which comply with the AWG standards at the bottom. The wire size listed in the graph at the intersection denotes the gauge of wire to use.Find the length of the circuit on the vertical axis of the chart, noting that the length is the round-trip distance from the panel or battery to the load and back.Find the current consumption of the load on the horizontal axis of the chart.Select either the 10% or 3% voltage drop chart, based on the type of load you are running.The simplest method we’ve found uses the charts below. Use the charts below to determine the correct wire gauge, based on the amount of current in the circuit and the length of the wire run.Įven the experts have to check occasionally on the correct gauge and ampacity (maximum amount of electrical current a conductor can carry) of wire for a given marine DC load. Even if amps are higher, distance run is lower.Marine grade wire is manufactured in multiple gauges for different applications. On the battery side, I should size for 70 amps (150/70 charge controller rating) and 10 feet max run to reach the batteries. Is this correct? Its only 15 amps, not starting a car. BUT, I'm a car guy.4 gauge is for starting a car! 30 feet of 4 gauge seems ridiculous. I need 4 gauge marine wire (tinned for salt water exposure) to do 30 feet. I looked on a page that said don't exceed a 2% voltage drop. The 150/70 will be mounted about 30 feet from the panels. On the boat roof, I plan to wire the panels + to + and - to - before running the two individual wires into the boat. In parallel, I assume I'll have about 15 amps max and 90 volts tops out of the panels. I will run them in parallel to make them more resistant to shading. The boat will be in the tropics and likely pretty hot inside and outside the boat. I believe I could have gotten away with the 150/60 per the Victron sizing calculator, but little over kill doesn't hurt. I purchased a Victron SmartSolar 150/70 controller. The panels are Voc: 85.6v Isc: 6.43amps each (not sure what they mean, but believe max volts and max amps while short circuited. I purchased 2 used SunPower 435watt panels for use on my small boat. I have a 12 volt boat with 6 group 31 AGM batteries (4 house/1 engine/1 thruster-generator).
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