Firstly, that
IS a heck of a battery!
("Crazy powerful"!) That's roughly 540 times more kWh/kg than a Lithium Ion, or about 150 times more than a Lithium-Thionyl Chloride at our humble TL7. There is no reason to discount these numbers, though, so I am using them.
With such a battery, a 50 g battery, would provide a 2 liters of water from a AWG at
current levels of efficiency (about 30%). If we assume that, even with the raise in tech levels, and miniaturizing the package, the efficiency would only double to 60% at TL15, that would lend 4 liters for a 50 g battery.
Now, the solar cells given are REALLY efficient. On Earth's surface, there are about 2000 W/m^2 under optimum conditions (2kW/m^2) If we assumed optimum conditions would last for 8 hours (they won't) then this would give 16kWh/m^2, at 100% efficiency. That means that the TL12 MT panels, if they are in fact producing about 80 kW, are operating at 500% efficiency, or they are in a location getting 20 times the insolation (w/w?) as the optimum of Earth's surface, and operating at 50% efficiency.
If they were giving about 80 kWh/space combat turn (15 min?), then this would be, on Earth's surface an efficiency of 16,000%. I don't know the numbers for MT, and
I'm not trying to play "gothcha," but it seems something is missing. So, to try to fix it:
If we did assume a 80% efficiency, under not ideal, but average Earth conditions, then a 1 m^2 solar panel would get about 6.4 kWh. That would be more than enough to charge the 50 g battery, that would produce 4 liters. Indeed, the solar panel could charge two of the batteries in 4 hours of decent Earth sunshine. A lot of assumptions here, but I'm using the best numbers I can find. I would certainly agree that ATV's, military, and other expeditionary vehicles typically have AWG's installed, of various capacities. But here's what I get:
The LSP AWG415 is a TL 15 unit, that costs Cr 450. It is 1 kg empty in the 1 liter configuration, will produce 1 liter of water in conditions of 40% humidity in Standard atmosphere in 4 hours, and has a storage capacity of 1 liter. The speed of production will vary inversely with humidity and atmospheric pressure. The 50 g battery, costs 10 Cr, and will power the unit for 4 liters, at which point it must be recharged. The unit contains storage for 3 batteries other than the one in use, and will automatically switch to a charged one. The accessory pack for the unit includes: cables to connect it to standrd vehicular, starship, or residential power sources; a roll-up 1 m^2 solar panel that will charge two batteries in 4 to 12 hours under most conditions of solar exposure; a 2-liter rigid, 4 liter rigid and 4 liter bladder container; a belt case for the unit with the 1 liter container installed that also stores the solar panel and an additional 8 batteries; a larger case that contains the unit and all accessories, which can be used to contain and operate it in any configuration, including filling the entire 11 liters of containers; and 12 batteries. The entire package weighs 2kg, with all the containers empty.
The AWG115L is just the 1 liter configuration, with the belt case, 6 batteries, the solar panel, and an extra 1 liter bottle with a slightly smaller, second belt case. It costs Cr 280, has the same performance as the main unit, and is a favorite with outdoor enthusiasts, military personnel, and the like.
The LSP-AWG-1 canteen holds 1 liter, incorporates the 1 liter container, for Cr 5, and has a small accessory pouch that contains a small solar still, water purification tablets, and has room for AWG415 batteries, and if left in the sun will charge 1 battery in 240 hours. It is compatible with lower technology lines of LSP's AWG, down to the LSP AWG212.
Extra 1 liter containers cost Cr 2, 2 liter container cost Cr 3, and batteries 10 Cr each, or Cr 90 for a pack of 10.