Solarland PV panels feature junction boxes that fit the power output and the requirements of the application where each module is commonly used. The smallest panels under 10W have a tiny junction box that is only 4cm x 5cm. This junction box does not include any type of screws, even the connections inside the box are made in copper screw-less terminals.
Panels from 10W to 60W feature a standard junction box. Connections are made with screw-in copper silver-plated terminals inside the box. These boxes are rated for 6 Amps and 1000 Volts and do not include any by-pass diodes.
Panels of the Series M, usually meant for Marine and other off-grid applications in harsh environments, feature the Pro-charge junction box. The down cover of this waterproof and dust-proof junction box is an IP65 approved design that includes a rubber seal. The Pro-Charge junction box has improved heat dissipation features that allows for better interior temperature and higher module performance. The Pro-Charge junction box is found in 70W panel SLP070-12M and 90W panels SLP090-12M and SLP090-24M
Click in the following link to download the Specifications for Solarland Pro-Charge Junction Box
Solarland modules over 100W are built with integrated output cables. The junction box in these modules is sealed for better resistance to any type of environment. In the back of the panel you will find two output cables with Multi-Contact Type IV (or MC4) connectors, one male and one female. The MC4 connectors allow for safe outdoor connections without the need of additional measures like enclosures, electrical tape or connection boxes. MC4 connectors provide a very easy mechanism to connect and disconnect the solar panels in installations that are not permanent where the panels need to be stored during some months of the year.
Solar panels with MC4 connectors significantly simply the installation when multiple panels are connected in series. A series of solar panels will need a separate output cable with MC4 connectors to connect the positive and negative ends of the series to the charge controller (or inverter). Individual modules will also need an output cable to be connected to the charge controller. In the case where the solar panels (or a series of solar panels) require to be connected in parallel, we highly recommend using Multi-Contact MC4 branch connectors, also known as MC4 “Y” connectors.