Solar panel wire size calculator

Panel Voltage: The output voltage of your solar panels. First, you need to determine the amps of your system and then use a wire size chart or calculator to find the appropriate gauge wire. I recommend a 20A or 30A fuse. Follow this to the left until you see the one way length of wire you need in feet. Enter the voltage running through the cable (V), the current running through the cable (A), the total length of cable needed (m) and also the maximum permissible percentage voltage loss (%V), typically 2. It uses the power (watts) of your solar panel and planned cable length. Nov 29, 2022 · The lowest fuse we can use is: 10A*1. 8 awg = 40a max. Y-BRANCH CONNECTORS. 28 Feet) 3 Meters (9. Standard operating conditions are assumed. com Mar 26, 2024 · Step 4: Calculate Solar Wire Size for Section 1. The higher your daily energy usage, the more solar panels and batteries you’ll require. Use a charge controller for the battery, if any. Solar array wattage = 100W × 4 panels. Now that you have applied the two NEC safety factors to your solar array’s maximum amps, you can determine the solar wire size you need for Section 1. 1 kWh = 1,000 Wh. Calculate the Maximum String Size. A large number of tools are present on the internet which Sep 5, 2022 · How Should I Wire My Solar Panels? If you need to calculate wire length against amperage, use this equation: The output of 7 amps derived from 15. 2. 6 m How To Use The Cable Size Calculator1 - Enter percentage cable loss acceptable [normally approx 2 or 3%]. If you know it, enter the Open Circuit Voltage (Voc) of your panels. The main issue is the wire size needed for the (usually) fairly long run to the Solar Panels. AC/DC - 12/24/36/48/120V/ and any other custom system voltage. This calculator will help you understand the factors involved in sizing wires for a solar regulator charging system. Resistance and Amps (current) determine the loss (voltage drop) This is a major reason for MPPT controllers, not because they can harvest 20% more in cold weather, but you can run a 100V string of panels at 8 amps and use skinny wire, instead of 20V panels at 40A (fat wires Jan 10, 2024 · Click the orange button at the top of the screen to download the Excel sheet (safe: no macros / VBA code). 7A. Having said that, if you take a 2,000 square foot home, the average solar panels cost equates to somewhere between $15,000 and $40,000. If you know it, enter the Short Circuit Current (Isc) of your panels. Renogy Super Solar Calculator is a sizing tool to help users quickly define their daily energy consumption, virtually build up their own solar system, conveniently place the orders, and even easily share with others. It does not account for your choice of MPPT configuration. If the total cost of your solar system is $10,000 the 26% solar tax credit would amount to $2,600. It is a well-known solar power wire that is used for connecting cabling in photovoltaic Step 1 – Calculate the following: Step 2 – Determine appropriate wire size from the chart below. Sometimes other sizing measurement units are used like AWG (American Wire gauge). 40. The primary factor determining your off-grid system size is your Daily Energy Consumption, measured in Watt-hours (Wh) or kilowatt-hours (kWh). 8amps * 0. my house is in the woods, so I have to put the panels 200 feet from the house (and consequently from the charge controller and batteries) I have 6 300 watt renesola panels. The highest fuse size we can use is 40A because the maximum current for a 10AWG wire at 90° insulation temperature is 40Amps. 20. However, typically used sizes range from 10 AWG (American Wire Gauge) for smaller systems, to 2 AWG for larger systems. Solar panels are sold in all kinds of sizes, but a 100-watt panel is a commonly found size, especially for RVs. First, we must calculate the maximum amount of current going through the wire. Required # of solar panels. 6 Watts. 99. Multiply your panel’s wattage by the number of panels in your array to get your solar array’s wattage. Physical size of solar panels. Let’s say you’re using 4 solar panels: Solar array wattage = Solar panel wattage × Number of panels. I need help with choosing wire size, combiner box, breakers, etc for my system. Nov 1, 2023 · The wires attached to solar panels tend to be 10AWG / 6mm². Lower is better. Do not allow the strings you are connecting to the inverter to exceed the inverter’s maximum input voltage or maximum current, or to fall below its minimum/start voltage. 7m2 for every panel installed. Type in the voltage of your solar panel. 6 Amps. Battery Amp Hours (Ah): 100. These solar panel calculators will help you with sizing your renewable energy solar panel system, including figuring out the number of solar panels and what size battery you need for your system. If you need advice, please contact your nearest dealer. We need to choose a fuse that is between 15. Take your inverter’s maximum DC input voltage. For extremely long runs, some might consider 10% acceptable vs. 17A x (5m x 0. Jun 15, 2023 · Parallel Amps = A1 + A2. The solar panels generate electricity which has to be transferred elsewhere - this is where solar cables come in. When extending wires, never connect them to a smaller wire size. You need volts, amperage, and distance to start this calculation. oynot Series Wired Solar Array Wire Size. #1. I'll be upgrading these batteries in the near future. It’s that easy. Jan 28, 2019 · DC Wire Size Calculator: http://www. com/free-diagrams/ Quality 105°C welding cable: https://amzn. How to Use an Amp Wire Gauge Calculator. See feature comparison table against other wire size calculators below. A 5 kW solar system may produce enough energy to power your home, but you may not have enough roof space for a system of that size. The more powerful the solar system (i. Adjusted Voc = 40V + 4. Apr 18, 2021 · This video will teach you what size of wire you need to wire your solar panels to your charge controller in your DIY camper electrical system. Divide voltage by current to obtain the resistance. We now have to use a voltage drop calculator to figure out which wire we need. Enter the total watts in your solar array. Nov 24, 2022 · Wiring solar panels in series requires connecting the positive terminal of a module to the negative of the next one, increasing the voltage. 3 = 0. Nov 1, 2023 · Select the battery voltage – 12v or 24v. 737V = 13. The following categories of wires exist: 1. It includes your inverter, solar panels, solar charge controller and battery bank too. Calculates the minimum cable size needed for a specific length to avoid voltage losses. Dec 1, 2019 · This free voltage drop calculator estimates the voltage drop of an electrical circuit based on the wire size, distance, and anticipated load current. This calculator makes sizing recommendations based on the average amount of sunlight received during Aug 7, 2023 · Step 1: Load Sizing. I left the distance and the loss the same. Off Grid Solar System Sizing Calculator. I am installing an off grid solar array with a battery bank. The Wire Size Calculator below will calculate the proper wire size for a circuit based on circuit amps, preferred (or available) wire insulation, conductor type and installation specifications. 56=15. When it comes time to file your taxes, this $2,600 credit would be deducted from the amount you owe, which would effectively reduce your tax liability. In the example, we’ll use 5m of 0. Alternatively, you can just use the formula: solar array output = electricity consumption / (365 × solar hours in a day) where the electricity consumption is yearly and expressed in kWh (our energy conversion calculator can help if your electric meter uses other units). Enter the number of solar panels in the array. 4 x 28a SLA/AGM batteries. 5623 = 9. Now, you would need to use a Jun 3, 2022 · The farther the distance, the bigger the size of the solar cable to use. JFMAMJJASOND0. Compare your calculated VDI with VDI in the chart to determine the closest wire size. If you want to know more about matching a solar module to a Victron MPPT Apr 9, 2023 · Use our solar panel size calculator to find out the ideal solar panel size to charge your lead acid or lithium battery of any capacity and voltage. 1. Step 2: make sure the ampacity of the wire is still sufficient even at the maximum ambient temperature. Solar Panel PV Wire. Jun 2, 2024 · They make finding the right wire for your solar array simple. For 48V panels, wire in parallel Nov 18, 2023 · To size the wires from the solar panels to the combiner, we’ll need to: Step 1: make sure the ampacity of the wire is not less than 1. Let’s say the length of the wires is 30ft to the charge controller. Calculate The AWG Wire Size For Different Parts Of Your PV System. 41 panels. Wire Circular mils = √3 x 2 x ρ x I x L / (%Allowable Voltage drop of source voltage) Where; ρ = Specific resistance or resistivity of Conductor. AS/NZS 3008 deals with an extensive variety of installation rules that allow PV system designers DC cable sizing calculator . It can also tell you whether a particular rating of cable would be sufficient for the task. Formula: Wire Amp Rating ≥ Number of solar panels in parallel × Short Circuit Current (Isc) Amps*1. Spreadsheet is here: (Right click Save Target as)http://www. 017) / 13. 84 Feet) 5 Meters (16. I have the bulk of the equipment which is: 1. The cable length may affect the wire size you need, so you don’t lose too much voltage. Ensure the minimum and maximum voltage are within the inverter range. Nov 24, 2022 · Two 100W solar panels in series. Features. 2A * 1. 5-foot maximum length with the same amp. Fill the yellow fields and press "calculate" buttons. D = Distance in Feet (One way) i. 25*1. Cables consist of conducting wires with a protective, insulating covering which must be resistant to moisture, sunlight, heat, chemicals and abrasion. Cables . A series wired solar array gets the voltage of each panel added together while the array amperage remains the same as a single panel. Battery Type: Lithium (LiFePO4) Battery Depth of Discharge (DOD): 100%. MINIMUM Recommended Cable Size (cross section area of two core cable) for:12V Renewable Energy Systems: Keeping Voltage Loss under 5%. However, the wattage output (W) of the panels Apr 29, 2024 · The thickness of the copper wire in solar panel wires, which connect the solar cells, impacts charge flow. For example, using the example above with a 600V inverter: 600V ÷ 44. Here is how you go thinking about this: Before solar panels, you paid $1,319 for 10,000 kWh of electricity. 36v) that was recommended so my calculations would say that 320w solar panel over 12m with 6B&S wire is ok. Always use at least a 10AWG / 6mm² wire. For example, I want to run a 10 amp load wire 50' with 5% losses or less at 12 volt. 5 - 4 - 6 - 10 - 16 - 25 - 35 - 50 mm 2. Then look straight up to the wire size at the top. Connectors . Single-phase voltages are usually 115V or 120V, while three-phase voltages are typically 208V, 230V or 480V. Allow oversizing above 130%. $19. If the distance between the solar panel array and the charge controller is 13ft, 10 gauge wires would be the right Solar DC Cable Size Calculator. We’ve included a section below to answer some questions you may have. With this calculator, users will be able to learn more about solar (power consumption, power storage, power generation, etc. Using the below charts, find the current in amps on the left. The size of DC cabling you use with your solar panel array or wind turbine system is very important. Repeat steps 1 and 2 for the rest of the string. When unsure, a 12 AWG cable is usually a safe bet. Calculate your cable MM by using the form below. See full list on solvoltaics. high amp rating), the thicker the cables needed. Use this calculator to calculate the required wire gauge size. Here is the formula that you can use to determine the decrease in electrical potential for solar PV cables. 62V = 44. Dec 24, 2021 · Dec 24, 2021. Mar 8, 2023 · When choosing the right solar wire size for a 200w solar panel, there are several factors to consider. Chosen solar panel power (WP) Total PV array power (Wh) for a day with worst sun hours. This also boosts voltage, but less than before. 4 - Enter length of cable run required [power source to load]. 5623 (safety factor) = 6. 774V or 6. 7V to 80V and the amperage from 18. For that reason, we’ve created this tool. Mar 26, 2023 · Take a solar energy system with 10,000 watts of output power and a 150-foot cable run between the panels and the inverter as an example. Inverters . 21 Feet) 20 Meters (65. By accurately measuring your total energy usage and the peak hours of sunlight in your area, you can calculate the size of solar Jun 18, 2022 · to get the size of the solar panel ; Types Of Solar Panels. May 11, 2020 · Voltage has nothing to do with the wire size (resistance) calculation. co. Once you have the max Voc of one panel, all you have to do is divide your inverter maximum voltage by this value, and then round down to the nearest whole number. 62V = 22. 8 Feet) 15 Meters (49. In comparison, the 12 gauge wire can be 7 feet long if the panel has an amperage of 10. Enter your panels watts and length and click the Calculate button to display your cable MM result. This helps match the mppt range. Save electricity : this free online calculator gives the AC and DC Power, Voltage Drop, wire energy losses, resistive heating, for three phase and single phase wiring. A 16 AWG wire is smaller than a 12 AWG wire, which is way smaller than a 4 AWG wire. 5mm2 cable with a resistance of 0. Easy! Oct 10, 2023 · Calculate the amperage by dividing the wattage by the voltage of the panel; common voltage range for residential solar panels is 20 to 40 volts, like 12v, 24v, and 36v. A charge controller is recommended as well. 3. Therefore, the total inverter size I need is (1800W * 20% + 1800W) = 2160W, which is equal to 2. First, take the average kWh power usage per day that you calculated in step 1, and divide it by the average sun-hours per day you calculated in step 2. Vd = 2 x L x I x R / 1000. To do this, follow the next steps: Connect the female MC4 plug (negative) to the male MC4 plug (positive). uk/cable-sizing-DC-cables. 70m x 1. This solar panel wiring size calculator lets you to work out the gauge of wire to safely take the solar DC power from a set of Solar Panels. 56 ×— 9. About 40 amps is the maximum current that could be handled by this setup. Calculate your required solar system size in watts. To find out what size solar panel you need, you’d simply plug the following into the calculator: Battery Voltage (V): 12. The altE Off Grid Solar System Sizing Calculator helps you correctly size the battery bank, Watts of solar power, and charge controller you will need for an off grid solar panel system in your location. Imax = Isc * 1. 8 x Wire Factor). As an example, for a 12V system with 10A of current and 100ft of wires with 90°C rated It is a useful number to use however, because the nameplate ratings of solar panels are given based on 1kW/m². 50. Voltage - Enter the voltage at the source of the circuit. Power (Watts) = 33. 5%, then hit 'calculate'. Mar 8, 2024 · For 12V panels, wire four in series for 48V input. 3% is considered an acceptable wiring loss in most cases. 5 feet is not enough room for most solar panel cables. For example, 50ah, 100ah, 200ah, 120ah. Panel Ampage (A): Maximum ampage produced by your solar The formula to calculate the size of solar panels you need is: Size of solar panel in watts = Total energy usage in a day / Peak hours of sunlight. solar-wind. The factor of \sqrt 3 3 is needed to convert between the system's phase current and line current. Most residential use solar PV panels are 12 volts. Dec 27, 2022 · This solar calculator is meant for camper vans, RV motorhomes, and small off-grid solar systems. You might have noticed I used 1. They will be wired 3 in series and 2 in parallel. This tool provides quick calculation means for sizing solar cables. Sep 20, 2023 · 2. Maximum Watts from Solar Panel/Array. Using a solar panel cost calculator is an excellent way to figure out specific numbers for your circumstances. custom maximum allowable voltage drop. Determine the required cable length. 1319/kWh) Jan 23, 2011 · Simple spreadsheet to help you optimize your solar PV system using the properly sized wires. To calculate the wire size, use this formula: 10 + log2 (Voltage x Current x Length / 0. This boosts voltage, lowers current, and increases sensitivity. The last step is to calculate the solar panel requirement at the site. Apr 22, 2024 · Step 1: Determine your Daily Energy Consumption. I = Load Current. Characteristics . 5 days ago · The calculator is designed to accept the total line voltage and current of the combined three cables. Let’s say you’ve just purchased a 200-watt 12v solar panel. It’s simple and straightforward to use. The calculation would be: voltage drop = IR = 4. It is important to get the wattage of each item you are planning to run along with how long you plan on running them for. . It needs to be no smaller than 46. LightCatcher Solar provides free solar wire sizing calculator for your solar system design needs. 3 - Enter max amps to be carried by the cable [amps = watts / voltage]. City: kWh Forecasted daily yield. Surge/Lightning Protection . The goal is to help you find the correct size solar panel, charge controller, inverter, and battery bank for your DIY build. Your solar panel kit comes with the appropriate wire size which are determined by amp capacity. ), retrieve your customized items list and wiring diagram. So, you will likely need to select the 10 or 12-gauge wire instead. This RV solar calculator will help you correctly size your entire camper solar system. Look at the solar panel specs to find this number. Your monthly electric consumption plays a big part in determining your solar array size calculation, so to get the most out of altE's solar panel and 🎁 7 Free Solar Diagrams: https://cleversolarpower. 56 ×— Isc, [let’s say the Isc of the 250W solar panel is 9. iI it’s a 12A system, the wire has to be 12A the absolute minimum. Now I Easy to use solar sizing calculator for entry level solar systems. In this case, Wire Amp Rating ≥ 3 × 10A*1. 6A. 282v This is also less than the 2% voltage drop (0. To calculate the voltage drop, you’ll need to consider several factors, including wire length, current, and wire gauge. Van Scans and 3D Models: 10% OFF Scans (code "FarOutRide") and 5% OFF 3D Models (code "FarOutModel"). Solar panel computation. To grasp this concept, imagine water flowing through a hose. This formula is the backbone of all solar panel size calculations. Add the length of the wire run from Nov 17, 2023 · Moreover, remember that utilizing the wrong cable size can result in considerable power losses and decreased system performance, which is why following the recommendations in the solar cable size selection guide, is essential. between batteries and to inverter, 50, 35 or 25 mm 2. I will need #6 AWG wire. 4. This means that your net investment after the credit would be $7,400 ($10,000 - $2,600). The mathematical calculation is complex. 6 days ago · This is when our solar panel calculator steps in. 5 - Click "Calculate" - results are Aug 31, 2016 · Wire Size after DC combiner box. Fuses & Holders . We also include links to solar wiring diagrams so you can fully connect your own system. Each home consumes a different amount of electricity based on various factors. 45%. html Designing a new battery bank for 24V system that will use 12 2V L16's. Wire Size Calculator. And you want to know what Key Assumptions and Disclaimer: The Enphase System Estimator is a tool to get a preliminary estimate of the size and savings of your solar and battery system. For instance, if your inverter’s max input is 1000V: String size = 1000V / 44. 5A] The minimum fuse rating required for your 250W solar panel is fuse size = 1. This solar DC wire size calculator helps select the correct wire size for the Solar panels to Solar inverter or Solar charge controller or Solar UPS system. (Average price of $0. BlueSun 24 Volt 370 Watt Solar Panel BlueSun 24 Volt 370 Watt Calculate the maximum panels per string for your inverter. 60. Based on our calculations, the 1200W Series-Parallel system will require the largest 10 AWG cables. A drop voltage less than 1% is suitable and in any case it must not exceed 3%. the three pair cable length runs for all wire sections to the regulator shown below. Voltage drop is crucial when selecting wire size for your solar panel system. The wire gauge size needed for a 1200W system would be 10 AWG minimum. Similarly, the 10 gauge wire has an impressive 9. Choose a solar wire size calculator online by using a browser. Solar Cable Sizing with AS/NZS 3008 . 5 to estimate amps needed for a 400W panel. At best, this can seriously impact efficiency through wasted energy and at worst, it can cause a fire and other damage to your system. Renogy Rover 40a MMPT charge controller. 62V. the running voltage of your system. Feb 12, 2024 · In this second test, the solar panels received more sunlight, although it still wasn’t optimal: At 21 Volts, our parallel-connected solar panels were producing only 1. Mar 17, 2023 · Unfortunately, 4. Solar array wattage = 400W. The standard size, 10 AWG, is a good starting point for solar panel wiring sizing. You will multiply the watts by the hours to get Watt-Hours. Wider diameter hoses allow for easier water flow, similar to how shorter wires offer less In the 1200W Series-Parallel wire calculator, I rounded up the output voltage from 79. Total daily load (Wh/day) { {totalDailyPowerACDC}} Worst sun hours a day (Hours) Total System efficiency must be between 0. spending $1000s on thick wire. Disclaimer: Forecast only shows raw solar module yield. 6A to 19. Input monthly electricity cost, electricity consumption or input detailed electricity usage. 6 awg = 50a max. 88A. 1 and 1. 56 as a safety factor. Step 2: Calculating Voltage Drop. For better protection underground, outside or in harsh conditions conduit or armored cable must be used. 16kWh. 25. 4 x 250w panels (photo with specs below) 2. When designing solar energy panel systems in Australia, calculating the PV cable size with the AS/NZS 3008 Standard is a valuable skill. Remember: Section 1 represents the wires that connect the solar panels to the solar charge controller. Using this solar cable size calculator: S＝ρ×L/R, where S is cross-section area, ρ AWG (American Wire Gauge) The size of the wire is measured in AWG (American Wire Gauge) and is a standardized wire gauge measuring system. Blog Post: http Nov 27, 2021 · The basic for awg / amps for home wiring (e. Manufacturer: blog . Apr 5, 2023 · Common wire sizes used for solar PV installations are: 2. Data Loggers . Ampacity rating of wire size must be at least 125% of the continuous current passing through it. 4 Feet) 10 Meters (32. ) and Feb 21, 2023 · The formula for calculating inverter size is to multiply the load requirement by 20% and then add it to the total load. 7. The biggest distinction in terms of size is between solar cable 4mm and solar cable 6mm. You will also need the solar savings estimator to figure out after how many years the initial investment in solar panels will pay back (for the 3rd solar payback calculator). Watts and Volts. Use our wire size calculator to save money on wiring, and manage your voltage drop more efficiently. to/3SzyuK4Copper 75°C speaker wire: https://a Jun 27, 2015 · If I did get the 6B&s 12m wire if I added another 160w panel later (320w total) I calculate the voltage drop of both these panels as being: Vd=(12 * 17. The final estimate will be provided by your installer. 61 Feet) 20 Watts. 00m, that’s around 1. The first step to sizing your system starts with what loads or devices you want your solar system to run. Simply stated, the higher the voltage, the smaller the wire size that is needed to carry the current. The formula involves multiplying your solar panel’s wattage by 1. 12awg = 20a max. Amperes - Enter the maximum current in amps that will flow through the circuit. 30. 08-31-2016, 04:08 PM. Results are displayed in green fields. Where: Vd = Voltage Drop (Volts) 2 = accounts for the total length of positive and negative DC cables (unitless) by doubling the one-way circuit length. 1 Meter (3. May 28, 2024 · The formula helps calculate the thickness of wire needed to carry the current safely. If cable of too thin a diameter is used, this can lead to heating of the wire. the rated power of your solar panels and load. Nov 17, 2023 · To determine the appropriate fuse size for a 250W solar panel, use the Isc value (provided with the panel) and can use the formula. Breakers A 10-gauge solar wire can handle up to 30 amps, a 12-gauge can handle 20 amps, and a 14-gauge can handle 15 amps. 10awg = 30a max * Panels have 10awg pigtails (30amps) but typically you don't want to go right up to 30amps say 25a max. from solar panels to charge controller to batteries 10, 6 and 4 mm 2. 6 Watts: Power (Watts) = Voltage (Volts) x Current (Amps) Power (Watts) = 21 Volts x 1. May 28, 2024 · May 28, 2024. Aug 23, 2022 · You want a solar panel that will charge your battery in 16 peak sun hours. For 24V panels, wire two in series for 48V input. 10 ft (4. This gives you the maximum number of panels you can have in a string. As a rule of thumb, the bigger the AWG number, smaller is the wire. 2 - Enter nominal system voltage [or pv array voltage for solar cables]. Bay Marine Supply: We're trying, let's see how it goes! Find your power usage, automagically size your components (battery bank, solar, etc. Let’s get started! Larger wire sizes are required in lower voltage DC systems than in standard AC systems. Power output calculator. g. ½ the total circuit length. 0371Ω/m) = 0. 10. The calculator can be used to simulate performance or used to calculate what size battery is required, how many solar panels and inverters can be used. up to 150ft of PV transmission): 14awg = 15a max. Solar panels for households typically come in the standard dimensions of 1. 25 times the maximum current. According to the American Wire Gauge (AWG) chart, the correct wire gauge for this setup is 2 AWG. This means that in the example below, there is 5 amps at 80 volts flowing through the wire from the solar panel to the charge controller. 12 AWG is the minimum recommended wire size for a 200w solar panel array. Basic rules for how to string solar panels. Modules . Use this to determine the right cables for your solar panels, be safe and save money. For copper wire, the nearest VDI = 31. Panel Ampage (A): Maximum ampage produced by your solar Detailed Instructions for using the Wire Size Calculator: Step 1 - The first step is to decide on the voltage for your system: 12, 24, or 48 volts. That panel is rated at 100 watts at peak efficiency meaning on a 78-degree cloudless day at solar noon on the equator during the equinox or whats called a perfect day. The actual sizing, BOM estimates & main panel compatibility may depend on site specific factors like roof type, electric wiring, etc This solar panel wiring size calculator lets you to work out the gauge of wire to safely take the solar DC power from a set of Solar Panels. Wire Rating, Length and Thickness. Aug 22, 2023 · The wire size from a solar panel to a charge controller depends on various factors including the distance between the two components and the system voltage. e. Before you start you will need to know. Calculating the DC wire size is vital for budgeting any electrical project, as a bigger wire size implies more expensive cables. Combiners . Values. Please enter the information regarding the PV array according to the table below. 037 Ω/m, which is typical resistance for a cable of this type. Enter the total amps your 200-watt solar panel produces. The equation for the area of a single wire is modified to: A = \frac {\sqrt 3 I \varrho L} {V} A = V 3I ϱL. 5A = 14. For more advanced considerations, use the Wire Size Calculator or the Advanced Wire Size Calculator. 6A and 40A. Calculating Wire/Cable Size formula for Three Phase Circuits. The solar cable, sometimes known as a 'PV Wire' or 'PV Cable' is the most important cable of any PV solar system. 82A. 6 Amps, which amounts to 33. Divide it by your adjusted Voc. Fuse size = 1. Excessive voltage drops can result in power losses and reduced system efficiency. Enter the information below to calculate the appropriate wire size. dx ed kx kv or pc fr gx di xn