I've plugged the ATV to charge when the battery was about 5%, it was with a 6kW constant input 24h a day for 4 days in a row, and it charged only 25%. If we do the math, it will take about 16 days to charge the ATV with this power. It's simply impossible to travel or explore using any vehicle. I left the Mars Truck charging in a medium solar pannel with more than 40kw input, and it charged less than 5% in one day. This is really annoying, waiting for the next release to see how this will be managed. I'm 5000m away from my base, and it's impossible to get back to charge the vehicles every day.
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