[RE-wrenches] MPPT on a MX60

[Steve Bell]

Hi Bill,

The original Voc of the array was probably about 91 volts, the original Vmp
of the array was probably about 68 to 70 volts. The 58 Vmp from the array
still seems somewhat low.  I would check for bad/corroded connections
causing a voltage drop while under load.

Best Regards,

Steve Bell

On Mon, Oct 2, 2017 at 8:27 AM, frenergy <frenergy at psln.com> wrote:

> Off-gridders,
>
>             Checked in on a 13 year old system and something caught my
> eye. Yes, everything is 13 years old.  First off: PVs: 14 (7 strings of 2
> PVs each), Shell 150's, batts: HUP 845 AHR, 48 volt system, MX60 CC.   So
> the MX60 was reading (mid day) ~1500 watts or ~27 amps (somewhat low for
> the array but acceptable considering age, soiling, tilt, etc.  Regardless,
> Volts "IN" were 58, batt volts were ~53.5.  This info was taken from the MX
> display.
>
>             For PVs that have an MPPT rating of 45.5 volts ( X 2 per
> string = 91V), that 58 volts seems especially low.  Normal?? Possible one
> string is pulling down the rest?  Feedback welcome.
>
> Bill
>
> Feather River Solar Electric
> Bill Battagin, Owner
> 4291 Nelson St.
> Taylorsville, CA 95983
> 530.284.7849
> CA Lic 874049
> www.frenergy.net
>
>
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