As your need for power grows, so can your RV solar system by adding additional modules to your existing Solar Kits or even to theWeekender ISWand Solar Elite charging system. Each Go Power! expansion kit includes a solar module, mounting hardware and expansion connections to quickly connect to the existing solar module on your RV roof. All Go Power! Solar Expansion kits are compatible with one another - 100 watts or higher. Go Power! Expansion kits featureMC4 connectors(multi-contact) for parallel wiring between our solar kits. This interlocking system allows for a simple installation that is reliable and safe.