It seems you implemented "old" admin format (index.html). With Admin3 there since 1,5years we are now require to have a slight new format Index_m.html. See also Template. And in general: Is Admin page working that way? load and save methods are missing ...
you set "supportStopInstance" in io-package but did not implement messages, please set to false
If you do not react on object or state changes, please remove the "on('state/objectchange' methods. Then also adapter.subscribeStates('*'); is not needed and should be removed.
Why oyu delete all objects and then recreate them? https://github.com/jkoeber/ioBroker.senec/blob/master/senec.js#L39 Beside it is strange it also might not work as expected because ll these methods are running asynchronous. ... Also all of them (ok, did not checked "all") are also created as instanceobjects .... or?
All created states miss "common.role" attribute. List of allowed roles see repository docs and www.iobroker.net page
you also should support compact mode ... and also therfor you need to store the "setInterval" return and implement on('unload') to clearInterval and call the callback
Hey,
I thought I also support with a short review, so thst it is faster later on to get info the Repo :-)
In general you can use https://adapter-check.iobroker.in/ to check basic stuff, there is some :-)