Example #1, 54 volts@5,56 would work for either a 12 or 24 volt bank. MPPT controllers need higher voltages 150% or more than conventional PWM controllers. You can go higher, up to their limit and they still work although slightly less efficiently, (they get hotter).
Example # 2, 36 volts @8.34 amps would only work if charging a 12 volt bank. (which is what you are doing right?) . When you parallel wire the two strings here the amperage will simply add.
36 volts is the typical 24 volt battery charging voltage. Your batteries will clamp the incoming voltage to whatever they voltage they are at the time and will gradually rise as the charge. You still need higher available voltage from your array to "push" the amperage into your batteries. This allows for voltage losses in hot conditions while still being high enough to be able to equalize.
Either scenario will net you the virtually* the same amount of charging power with the MPPT controller doing the DC to DC conversion. * slightly less with higher voltage input .
Example # 2, 36 volts @8.34 amps would only work if charging a 12 volt bank. (which is what you are doing right?) . When you parallel wire the two strings here the amperage will simply add.
36 volts is the typical 24 volt battery charging voltage. Your batteries will clamp the incoming voltage to whatever they voltage they are at the time and will gradually rise as the charge. You still need higher available voltage from your array to "push" the amperage into your batteries. This allows for voltage losses in hot conditions while still being high enough to be able to equalize.
Either scenario will net you the virtually* the same amount of charging power with the MPPT controller doing the DC to DC conversion. * slightly less with higher voltage input .
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