Is the connecting cable included? If so, how long is it and can longer ones be purchased? If it is not included, what accessory cable needs to be purchased at what cost?

Dear customer, thank you for your inquiry about Jackery products. For the product you are inquiring about, which is designed for paralleling more than two solar panels to power stations, no cable is included in the package. If you are only connecting a single solar panel, there is no need to purchase an additional cable, as all our SolarSaga solar panels, except for the 40W mini, come equipped with an integrated cable for connection to the portable power station. The standard cable length for both the SolarSaga 100W and 200W models is 3 meters (9.8 feet), which generally offers enough reach for setups in close proximity. Should you find yourself in need of a longer cable to better suit your camping or outdoor requirements, we also offer a 5-meter (16-feet) extension cable available for separate purchase. You can easily find this extension cable by searching for "Jackery DC Extension Cable for Solar Panel" on our official website, where you can also view the pricing details. This extension cable adds flexibility to your solar panel placement, allowing for optimal solar energy harnessing while keeping a convenient connection to your portable power station. If you require any further assistance or have additional questions, please do not hesitate to contact our customer service team (Customer Service: hello@jackery.com / +1-888-502-2236 Weekdays 9AM to 5PM PST). We appreciate your interest in our product and look forward to serving you. Warm regards, Jackery Support Team