I recently aquired a 45 Watt solar panel and am now curious about how best to use it. I am currently connecting it to a 60 amp hour battery, on which I would like to store electricity to run small lights and a laptop computer. How can I figure out if this setup will be enough for my small uses? The panels are putting out about 20 volts, so I am getting about two amps. I used to use a 6 amp charger (from an AC outlet) and it took about 14 hours to charge the battery. So now I am wondering if my 45 W panel will keep my battery charged at my use rate. I have in the past run a few small lights on my battery, and it lasts for months on a charge. I would like to run a telephone and a laptop computer. The computer has a 12 volt socket plug which connects to a port on the computer labelled 19 V DC. Any help? Do I need more panels? Can I hook two panels to one battery? If so, should I hook them in parallel or in series?