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Multi Channel Battery Charger

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Multi-Battery (Gang)Charger

Key Specifications

AC In: IEC for 120 to 220VAC
DC In: 12VDC to 30VDC 2 Pin connect that mates with whats on the GP solar blanket.
DB9 for RS-232??
USB B connector (Its a USB device)
Two indicator lights per battery channel
- Red Led and Green Led. Use the same setup as in the laptop. Red, Green, and Yellow both are enabled.

switch batteries.

Density. Getting as many batteries as possible in as small a footprint is a goal.

Physical Safety. Its got to be stable and hold lots of heavy batteries but not be able to fall over on top of a child. Who might be trying to climb on it to get his battery.

Stackable. More vertical space is available than floor sq footage so an idea was to make them stackable. But see above point.

Heat dissipation. Each battery needs 15W worst case and most of that power will be dissipated into the batery. I expect the electronics/battery to dissipate less than 1W/battery. PSU at 300W @ 85% efficiency is 45W.

Enclosure. Metal. Except perhaps for some plastic for the battery holder. Having metal available to heatsink to should help in keeping the electronics from burning up in hot countries.