@Sweebee right, the boxes are those:
http://www.aliexpress.com/item/Two-Style-small-plastic-box-IP67-waterproof-electronic-cases-abs-plastic-enclisure-diy-junction-box/32296423555.html
just just... for the 1W solar pannel but it fits in diagonal.
The solar pannel is from the mysensors store, comming "from australia" I don't know really where from but very fast shipping and real 1W !
Lipo are 1500mAh and 4000mAh:
http://www.ebay.com/itm/171765587681?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
BTW if you're interrested in standalone sensors, have a look at the thread that shows 2 ways:
http://forum.mysensors.org/topic/1484/solar-pannel-and-lion-or-lipo/7