There's a serious misconception here too -- the maximum voltage that the
controller will handle depends on the design of THAT particular model.
SOME MPPT controllers are designed for a max voltage of 24V, others for
48, and so on. Ditto for current ratings -- the relevant spec is the max
short-circuit DC output of the panel(s). Genesun, the mfr whose MPPT
controllers I recommend, has several models for different voltage
ranges, at least as high as 24V battery voltage, and maybe high as 48V.
Last I looked, their biggest model was rated for 10A.
73, Jim K9YC
On Sun,3/19/2017 12:15 PM, Paula Keezer wrote:
I have seen some misconceptions about MPPT. The best reason to use MPPT is
so that you can put multiple solar panels in series and you will not exceed
the maximum input voltage of the controller. The controller will continue
to charge even in partial sunlight just as long as the input voltage exceeds
the battery charge voltage (in this case 14.xx volts). Since solar panels
in series ADD voltage, with two solar panels you get a 24 volts (well, more
like 32 volts in full sunlight) and when those panels are in shade, the
individual panels may drop down below 12 volts but the sum of the two will
be much higher than the required charging voltage.
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