Okh, I don't think that javadch wants to imports models, but rather he wants to store additional data. [;)]

Ah yes, commendable wish [:)]. Sorry if I confused things. Just a question of wishful thinking on my part, I guess. Sat with an electrician yesterday to calculate electric requirements, wire-diameters, voltage-drop and fuses for a 12V solar system (I did make models of standard batteries and solar panels for the project). Would be interesting to see any related work. ok