Does the laptop not have a built in charger? Thus you will have nothing to do there, other than wait and something like 19.5 V to play with once charged?
and charge both the netbook's battery and the additional 12V battery (likely lipo) simultaneously.
oh! I thought you were using a seperate supply for the motorsQuoteand charge both the netbook's battery and the additional 12V battery (likely lipo) simultaneously.I'm making something similar ATM (no laptop), but using a solar panel to charge a 12V gel battery. Power requirements should be within daily charge capability, but I will be adding a sun-bathing routine if the bat gets low. I'll put the panel at optimum angle and allow the unit to rotate toward the sun. Bit dark for testing at the moment So waiting for the spring. Continuous activity is not necessary as this is an exercise in navigation rather doing any useful work. For that I will probably aim to set up a self serve "fuelling point" as the area available will not allow a high enough current density from a PV panel.Good luck
Are you using anything like a solar charger shield? Can those use an arbitrary external power source instead of a solar panel to recharge the battery?
Quote from: Cerin on Jan 17, 2013, 06:18 amAre you using anything like a solar charger shield? Can those use an arbitrary external power source instead of a solar panel to recharge the battery?That shield is designed specifically for a single cell lithium battery. Can't change the output voltage.To charge a lead acid battery a ready made solution would be called an "on board battery charger" (example). In real world use they are designed to stay permanently attached to a car/boat and then plugged in to a wall socket to maintain the battery.For a non-ready-made solution I'd look at something like a UC3906. Lots of examples from Mr. Google on this.
Thanks, but I was referring to the *input* source, not the output. e.g. charging the single lithium from a wall supply instead of a solar panel. If it expects a certain voltage/amperage from the solar panel, what would be the problem in getting that instead from a wall adapter?