UP Voltaic OffGrid Solar Backpacks

UPDATE:I wanted to know what actually happen when I have only one or two charge lights on (not blinking); is it charging in this case? So today I rigged up someplug and I connected a power analyzer between the storage battery and the pannel. I placed the solar pannel against the window so I don't have direct sun light.in this set up, I got two non-blinking charge lights and the power analyzer reported a current of 0.0 to 0.03 Amp entering the storage battery (most of the time,there is no current at all). So this means that when the charging lights are not blinking even if they are on, there is not much charging going on.On the other in direct sun light, it is different. In this case, the lights are blinking and I can get something like 0.3 to 0.5 Amp.--------------------------------------------------------------------------PREVIOUS UPDATE---------------------------------------------------------------------I always have the storage battery (one that came with the backpack) plugged into the pannel. I found that even when I am not using the battery to charge anything,it will drain quickly when it is not being charged in the sun light. For example after being out of the sunlight for 12 hours, I lost one charge light. It wentfrom 4 charge lights to 3. I do not like the almost-to-nothing documentation that came with this product. It never explain any of this. Why is the batterydrain too quickly when I am not using it?------------------------------------------------------PREVIOUS UPDATE:----------------------------------------------------------------------------I finaly get enough summer sun light to test this backpack charging ability. This is what I found. The storage battery's charging lights will only be blinkingsequentialy (indicating that the battery is being charged) when in direct sun light. When not in direct sun light (like near a window), the charging lights are not blinking, but one or sometime two charging lights will be on. Whatdoes this means in this case? Is the battery being charged in this case? I really do not know (the documentation is not clear on this). I assumethat the battery is being charged at low capacity (at least I hope that is the case) and I also assume thatthe number of lights that are on indicate the charging capacity.Also even in direct sun light, the solar panel's output charging current is not as high as the current drawn by the cell phone so when I am charging my Nokia cellphone while walking or riding my bike in direct sun light, the storage battery will be drain. This means that my cell may not be completely charged and thestorage battery may be completely drained. This is especially true if the storage battery is not fully charged at the start of a charging session. This is disapointing because what is the point if I have to fully charged the storage battery at home before begining a trip. I would like to be able to charge my cell and still have enough excess current to charge the storage battery as well. The longer I use this backpack, the more I am disapointed with its performance.------------------------------------------PREVIOUS UPDATE----------------------------------------Well I have been using this backpack for 4 months now and it is ripped in a dozen places. I have had it repaired three timenow. I am not happy! Please do not buy this product. I am lucky I am traveling outside the US where there are many shopsthat will repaire my backpack. In the US where there is no such repair shops, this backpack would have been completely useless and I wouldhave thrown it away after a few months of use. I do not recomend buying this backpack.------------------------------------PREVIOUS UPDATE---------------------------------------------------------------------------Due to the winter I have not be able to test the solar charging feature. But the backpack fabric quality is terrible!When I ordered this backpack, I picked the charcoal pennel. But I got an email from the seller telling me that they "accidentally"shipped the silver pennel. They wanted to know if that is OK or I can wait two extra days and they will ship me the charcoal pennel.I thought it's not a big deal so I say OK, I'll take the silver one.Well when I got the backpack, it had a small wear near the pennel zipper that made it hard to zip an unzip the pennel pocket. I was nothappy but I did not want to deal with returning and reshipping so I let it go. I know, I can not say for sure that they intentionaly sent mefaulty backpack but I am saying I did get a weird feeling in this case. If my subspicion is correct, I think it is extremely unprofessional ofthem.I had not used the backpack until a month ago when I went on a 200km biking trip. On this trip the backpack fabric torned (ripped) in three places.All near the front pocket. It was not the threading that got ripped. It was the fabric near the threading area the got ripped) Fortunately, I was traveling in an Asian city where they can repair backpack. Thus I had it repaired and it seems fine.but I have to be very carefull to not load the backpack too much again.I owned two other non-solar backpacks and I regularly overloaded ( to a much higher degree than I loaded the solar backpack) them for a year now and it never ripped.It is winter time so I have not fully test the solar charging feature but where I was biking, there considerable sun light and my cell phonealmost completely drain the battery in the backpack. Thus at this point I don't have much confident in the solar charging feature but I willwait until summer time to test in full direct sunlight and I will give an update.

awesome backpack! Love it!

Backpack poorly sewn, started unraveling from few seams within weeks. Not enough current on a sunny day to charge my 4" cellphone. I would be better off with a small recharging battery, and not have wasted the money on this.