[WTA] SOLAR PV

[sayio]

hi, admin.

currently i bought

http://www.cytron.com.my/viewProduct.ph ... er%2012V5A
http://www.cytron.com.my/viewProduct.ph ... ead%20Acid
http://www.cytron.com.my/viewProduct.ph ... ar%20Panel

to make a power supply using solar PV.
thus, how i want to know, how to calculate the charging time for single unit battery with 2 unit 10W solar panel?
if my load is 10W, how long the battery can survive before the charger controller recharge?

thanks:)