Many buyers of solar chargers (esp. moi) are surprised to encounter the reality: we don't stay in a sunny place long enough to obtain a meaningful charge. We move, shadows are cast, clouds pass, valuables are stashed & secured. We don't sit still (save for our ill-lit cubicle caves), we worry about theft, weather happens.<p>One hour use per two hours charging is fair given the technology. Short of extreme scenarios, are you seriously going to leave your laptop out in the open, most likely unattended, for 2+ hours? or all day?