I have a question about having a Times Series Chart widget displaying real time data from Kepware tags. Is this possible to do without using a refresher widget?
You can accomplish this by adding a Time Selector widget. Then in the widget Properties, you can select the interval to be displayed. For example, if you wish to see the last hour of data, enter 1 and make sure the IntervalType is "Hours." Then set the refresh interval (in seconds) to an appropriate value. This would allow the update to occur without intervention from your users. You can also hide the widget by deselecting the Visible indicator at the bottom of the Properties panel.
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Try getting the data for your trend with the "getProperties" service - which you can set to auto-update (checkbox down in the bottom right when the service is selected). This should push property updates to the Mashup on DataChange, so you should be able to display the data as it is changing and arriving from KepWare.