Yes. Please read the mining guide.

https://github.com/spreadcoin-project/SpreadCoin-Wiki/wiki/Mining-Guide

Thx found what I was looking for...

I'm getting this message even if my hash rate shows mining :

No suitable long-poll found for http://

any clues ?

crazy dumping time~

Yep, he has only so many SPR to dump, this will be over soon. :-)

Thanks.  I say go for it. Even with just <100 $ you can start.
You don't need a heavy 100 Ah Battery like me. Use a much smaller one and learn how it works.

Also, with 12 Volts DC there is not really any danger of you getting hurt.That's what I like most about compact solar energy.
(but be careful with AC and higher voltages, also those large batteries are not toys).