2 panels half the size should in theory deliver the same power (voltage doubled, current halved)
I believe you didn't tell us your power and size requirements yet.
lg, couka
Well Power should be around 1.5A throught the day (which is 10 hours at least, not sure about the entire hours being with direct sunlight but if not then it's ok, we don't have many days like these)
The panel I bought is 2V 150mA and I'll probably need around 1.8A +/- for the entire day so during the summer I'll have enough and in the winter I understand I'll loose more power. I'm also aware that the specs says 1 thing and I'll get less and that is fine as well. maybe I'll adjust the power consumption to be less if I can't do anything about it.
The size shouldn't exceed 80mm X 80mm.
There is this one that I may buy that may be able to do it for me:
Small Solar panel
There is an option there for 3V 155mA with the dimensions I need but I want to make sure these will be good for me because I already bought the 2V 150mA ones and if I won't need those I've bought them for nothing and I don't want it to happen again :o 
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Again thank you for all the answers.
If the panel is not tracking the sun (that means it is not moving to face the sun), then you'll get between 1 to 7 times amp capacity per day, on average.
That value varies a lot with latitude, time of year and of course, weather conditions.
e.g. an 100mA panel will give between 100mAh per day in a high latitude winter day and 700mAh in a low latitude summer day.
Expecting 1.8Ah per day from 0.15A panel is unrealistic. It would require 12hours/day full sun, perpendicular to the panel surface, in perfect clear atmosphere
Wait so 100mA won't give me 100mA per hour in a bright sunny day? (80 is also good)
We have here between 10-14 hours of sun (winter-summer). and I'm going to place it in the best place I can.... I know I won't get the max but if I have at least 9 hours of sunlight won't I get more than 700mA?
And my panel right now is 150mA.... so won't that help as well?
Trying to understand if I made the right calculations or my entire foundations are wrong.
Thanks again.
You should look on maps or calculators for your location, preferably those that show values for high-yield and low-yield months.
This one for example calculates an average of ~2.5kwh/day for a 1kwatt panel in Aachen/Germany, Unfortunately it doesn't show monthly or seasonal yields.
Consider the fact that in 12 hours the sun travels an 0 to 180 degrees arch, the angle with a fixed panel will be sub-optimal (90degree optimal) most of this time, and any extra hours above 12 the sun will actually shine behind the panel. And there is also a fair amount of either cloudy weather or just loaded atmosphere.
blimpyway:
Consider the fact that in 12 hours the sun travels an 0 to 180 degrees arch, the angle with a fixed panel will be sub-optimal (90degree optimal) most of this time, and any extra hours above 12 the sun will actually shine behind the panel.
Not at the poles during part of the year, if the panel is horizontal and on the ground (ice?). Land of the midnight sun!