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8 panels in parallel. So it would remain 12 volts but 22 amps. Given the difference in efficiency is only like 3 % at that point. (Closer to 12 the better)
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Once your panel voltage is over 2x the battery voltage, the charge controller is working harder and has more loss, downconverting 70V to 12 for charging.
MPPT is good for the long runs from panels to controller and being able to use small wires for the high voltage.
You need to study the manual for your charge controller to see what voltages it requires to have good MPPT action for charging 12v batteries. If the solar voltage is too low, the MPPT cannot work well and you loose power.Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-ListerComment
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