You are planning on putting the solar panels on a van. To calculate the energy it can supply the battery with, divide the Watts by the Voltage of the Solar Panel. For the wire size, use a wire size calculator like this one:  http://nooutage.com/vdrop.htm. Use our electrical conversion calculators to calculate electrical properties given other known values. If you already have the panels, then be sure you test them for shading before making decisions about parallel or series. I have a solar panel rated at 250 watts connected to a deep cycle 100 amp hr battery. On my RV I have two 325watt panels. Convert the amps to watts with our electrical conversion calculator, plus learn the formulas for DC, single-phase AC, and three-phase AC circuits. Many home systems run panels in series up to 600 volts, so shading cannot be much of a factor for home installations. Started 2 hours ago, By Even the Boulder 90watt panel lists 9 -18 hours charging time. Define your peak instantaneous power output, measured in watts: Determine which appliances you’ll be running at the same time; add their power draws, in watts. 120 Watts / 18v = 6.6 Amps Please note that Solar Panels are not 12v, I repeat Solar Panels are not 12v.   You cannot paste images directly. Given this, to find amps given power and voltage use the following formula: Thus, the current I in amps is equal to the power P in watts divided by the voltage V in volts. I have heard about panels with diodes, but have not seen diodes mentioned in the panels specs I have looked at in the past. Not that I have looked at very many panels. It is possible to find the amperage from kilowatts if you know the voltage of the circuit using Watt’s law. The same goes for the 2 to 4 feet of the heavier cable (#2 to 4/0) to go from the controller to the batteries or battery to inverter. The Coleman 40W Crystalline Solar Panel is the ideal choice for generating power in remote locations or as part of a back-up power system. Depending on the brand, its efficiency, and the equipment that’s included, prices can … Converting watts to amps for a single-phase AC circuit with power factor uses a slightly different formula. Ive seen people use 4 Gauge in similar current applications since THE BIGGER THE WIRE THE LESS VOLTAGE DROP. My concerns are amps through the wire and what gauge wire to use. I cant say. This state-of-the-art 400 watt solar panel with Pure Black™ technology optimizes power, performance and aesthetics. Started September 28. . Download Manual Share Features. If we look at Go Power's 100-Watt Retreat Solar Panel as an example, we can see that its power output is 5.43 amps per hour. Wire them in series and you loose both panels. Just for a comparison in say January in South Central Florida subject to the suns intensity and angle of course, my flat rooftop mounted 1080 watts of solar might ??? A 100W solar panel, like the Renogy 100W (I own two of these) generates about 6 amps per hour (6-80 watts) during the peak sun hours of the day. Convert amps to kilowatts for AC and DC circuits with our amps to kw calculator, along with the formulas and examples on how to do the conversion. If we assume 6 usable hours of sunlight per day, that's 32.58 amp-hours per day, which is pretty close to our ballpark figure of 30 amp-hours per day. Interesting read on solar panels and shading, especially the part about bypass diodes. Started September 29, By Depending on the intensity and the hours of direct sunlight received through the day, the panel generates between 20- and 30-amp hours (Ah) throughout the day. Clear editor. I was wondering about the fuses available. × Any one who works out the Amps of a solar panels using 12v as the voltage calculation does not understand solar or has been misinformed. × Two runs of 10 gauge wire, lot easier to run than 6 or 4 gauge I would need if I was running in parallel. From the roof to the mppt is going to be 8 gauge. At a full charge, a 100 watt light bulb ( incandescent) lasts less than 2 hours before the inverter shuts down. Solar Power: Solar panels are sold in varying sizes, but a 100 watt panel is a commonly found size – particularly for RVs. Amps to Kilowatts (kW) Electrical Conversion Calculator, Capacitance to Charge Electrical Conversion Calculator. Everything thing is 12volt in the van also. Average solar module watt per our and as per standard condition we take 5 hour 150w 4 no. A 400watt panel is about 6 feet by 4 feet. For example, find the amperage of 1200 watts at 120 volts, current = power ÷ voltage Caution with cutting off the MC4 connector on the solar panel. Also, can mc4 connectors be attached to 2 and 4 gauge? A switch has just as much of a chance of voltage drop as a fuse. Solar installers consider the following factors to calculate the number of panels needed: Local sunshine: How much energy a solar panel produces depends on the sunlight received. So if you have a 100Ah RV battery, you can charge 50% of it in a little over 8 hours (50Ah/6A=8.33). Hi Guys here is the new video from my channel "How to check amperes and voltages of solar panels || 300 Watts Solar Panel." A 200 watt 54 cell panel produces 7.4 amps. ALL SUBJECT TO any max input voltage range of your charge controller, although many MPPT have a wide input voltage range maybe even as high as 100 volts or more. 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