You can use this calculator to select the right size charge controller for a 200W solar panel. For my case, I selected the following parameters for the calculator: Solar Panel Watts: 200W. Battery Voltage: 12V. Voc of solar panel: 23.85V. Based on these parameters, the calculator gave me a result of a 20.8A charge controller. This kit comes with two 100W Monocrystalline Solar Panels totaling 200 Watt, one 20 Amp MPPT Charge Controller, 20' MC4 Extension Cables, and two sets of Z brackets for Mounting. Free Shipping! On Sale! Below 200W Solar kits. Premium Kits. RV/Van/Marine. Starter Kits. For instance, if you have one of our 40Amp charge controllers, we would recommend using an 40Amp fuse. The second fuse between your solar panels and charge controller is a little bit different to figure out. The size of this fuse is dependent on how many solar panels you have and how they are connected (series, parallel, or series/parallel). Allowing for a 1.5% voltage drop in the wire sizing calculator, we can see that we can use 8 AWG Wire for these wires. Try it for yourself. Here are the inputs used: For Each Panel to the MC4 Combiner. 5 Amps. 20 Volts. 20 Feet of Wire. 1.5% allowable voltage drop. From the MC4 combiner to the Charge Controller. Charge controllers are necessary to keep the batteries properly functional and long lasting. If you have a 200W solar panel then you will need a charge controller of 15 Amps approx. You can also calculate the ideal size for your integration as well. This is found by dividing the total Wattage (400) by the Voltage (20). That means that you would need a 20A charge controller. Determining the size of the charge controller needed for your solar panels needs a bit of simple math. Luckily, math won't be too difficult. 0WSx8.

what size charge controller for 200w solar panel