Home » FAQs » What size cable for 200w solar panel?

When looking for the right cables to use with your 200W solar panel, it’s important to consider a few different factors. In this article, we’ll take a deep dive into cable sizing, discussing everything from wire gauge to voltage drop and more.

Wire Gauge

One of the first things to consider when selecting a cable for your solar panel is wire gauge. Wire gauge refers to the thickness of the wire itself, with lower numbers indicating thicker wires.

In general, you’ll want to use a thicker wire with higher wattage solar panels. This is because thicker wires are better able to handle the increased current that comes with higher power outputs.

For a 200W solar panel, we recommend using a wire with a gauge of at least 12 AWG. This should be sufficient to handle the current without experiencing excessive voltage drop or other issues.

Voltage Drop

Another factor to consider when selecting a cable for your solar panel is voltage drop. Voltage drop refers to the amount of voltage that is lost as electricity flows through a wire.

As electricity travels through a wire, some of it is lost as heat due to resistance in the wire itself. Thicker wires have less resistance, which means that they experience less voltage drop.

To calculate voltage drop, you can use the following formula:

Vd = (2 x L x I x R) / 1000

Where Vd is the voltage drop in volts, L is the length of the wire in feet, I is the current in amperes, and R is the resistance of the wire in ohms per thousand feet.

Using this formula, you can determine the amount of voltage drop that will occur over a given distance of wire at a certain current level. For example, if you’re using a 12 AWG wire to connect a 200W solar panel that produces 10 amps of current over a distance of 50 feet, the voltage drop would be:

Vd = (2 x 50 x 10 x 1.588) / 1000 Vd = 15.88 volts

In general, you’ll want to keep voltage drop below 3% for the most efficient energy transfer. If your voltage drop is too high, it can lead to decreased efficiency and potentially even damage to your solar panel or other components.

Temperature Rating

Another important consideration when selecting a cable for your solar panel is temperature rating. Solar panels can generate a significant amount of heat, especially in direct sunlight, so it’s important to choose a cable that can withstand these temperatures without degrading or melting.

In general, we recommend using cables with a temperature rating of at least 90°C for solar panel installations. This should provide enough margin to handle the heat generated by your solar panel without experiencing any issues.

Connector Type

Finally, it’s important to consider the type of connector that you’ll be using with your solar panel. Most solar panels use MC4 connectors, which are designed specifically for use with solar panels and inverters.

When selecting your cable, make sure that it comes with the appropriate connector for your solar panel. You may also want to consider purchasing a pre-made cable assembly, which will come with the appropriate connectors already attached.


When selecting a cable for your 200W solar panel, there are several factors to consider, including wire gauge, voltage drop, temperature rating, and connector type. By taking these factors into account, you can ensure that your solar panel is connected safely and efficiently, allowing you to maximize the amount of energy that you’re able to generate.

Published On: 2023年5月31日Categories: ,