Charging N800 from the powermonkey battery charged from elctrical outlet works but the solar panel does not seem to work all that well. I charge the powermonkey battery using solar panel keeping it in direct sun for about 4 hours and indirect sun for another 6 hours. At this point powermonkey battery shows 4 bars. 2 minutes after I connect it to N800, it goes down to 2 bars and another 3 minutes later, powermonkey battery is dead. I did try to condition the powermonkey battery by fully charging it from electrical outlet and discharging it about 4 times but that did not help with charging the battery from solar panel. I am hoping it will improve after a few more charge/discharge cycles and actually get some decent charge from solar panel.

I've been doing some tests, and it seems I have found the problem. Basically, the charger for the n810 has an output of 890 mA. On the oposite side, the powermonkey explorer has a max output of 700 mA thus making the charging of the n810 not appropiate under some circumstances. If your n810's batery is empty, it will not detect the powermonkey is providing power, and it will fail. If you just charge a little bit the n810 from another source, start it, and then plug your powermonkey, it will just charge ok.