10FT MC4 to 8mm Adapter Cable for Jackery | Universal Solar Panel Connector and DC8020/7909 Compatible with BLUETTI, Yeti, Anker, Jackery Portable Power Station for Camping, RV, Emergency Use

No, they arent proprietary its just a barrel connector as far as im aware. Most modern panels use an MC4 plug for their output, you just buy a converter, shouldnt cost more than like 15-20 bucks. example - https://a.co/d/02br2PIa You can calculate the draw you need based on what you plan to use. Your home wifi/router combo is probably 10-15 watts/hour, a laptop is maybe 60 watts/hour, charging a phone like 50 watts/hour. If you have a 1000 watt unit, assume 90 percent of that is usable... you have around 900 watt hours to play with. That means you can run a laptop and router for maybe 9-10 hours and also charge a phone. Not too bad.