Two questions: 1. Can it support sumpump? And 2. Will it kick off automatically or does it need to be manually connected?

The size of the generator needed is dictated by the power requirements of all of the items you want to run. We recommend working with an authorized Generac dealer to determine the generator size that would best suit your needs. If you need assistance finding a local dealer, we recommend using our dealer locator found here: http://www.generac.com/dealer-locator . Model #7000 can be installed to manage any home standby unit and will also be able to be used with a whole house back up generator during an outage. Generac model #7000 you are able to prioritize loads power items that are most important during an outage through customizable load priority selection. Lock-out feature smart management modules feature a lock-out system, which permits blocking of specific loads only when using generator power, allowing for the important loads to be powered more often.