Kudzai

For safety reasons, especially during shipping Coslight employs a different battery switching on mechanism
1) First open the top cover of the battery, you will see the screws around the top cover
2) press the 1/0 hole with a paper clip, or anything that can fit in than hole
3) partially open the cover, take a screw driver and short the neutral terminal? with the positive (I think) (there is a black rubber clip which you have to remove in order to do that. Thats how mine were switched on by the technicians. The batteries will switch on. 

hello,what eventually happened with the batteries

@Kudzai don't know of any software for that but i've found plenty of excel type files to design solar panel, battery bank and inverter size. Can send you some via pm if you like. I know there's one excel spreadsheet under downloads here as well, can't quite remember title but i've got that one too. Also i've used the link below: https://www.altestore.com/store/calculators/off_grid_calculator/ they have a lot of good youtube videos as well.