I had 2x200 watt 12v nominal panels connected in series attached to my Victron 100/20 charge controller. The most watts they ever pulled was ~270 according to VictronConnect. I figured it was due to a very long cable (70 feet). So recently I added two more panels to get the panels up to 48 volts, and should be 800 watts. But in VictronConnect it's still showing only around 270 watts on a perfectly sunny day. In Connect, the voltage is showing that it has doubled since there were just two panels, so that looks good, but the amps is showing that it's been halved. Any ideas?