[RE-wrenches] MPPT over amp

[Matt Partymiller]

Bill,

To answer your first question, you can wait 45 minutes on hold before SMA
hangs up on you.  If you are waiting for a call back, good luck.

I have asked your MPPT question of SMA and they told me there was some
tolerance if we went over mppt amp rating (two strings pushes it in many
instances).  They have also confirmed that we can put 100% of inverter
POWER rating on a single MPPT without any clipping (leaving the other MPPT
empty).  I did not get into the MPPT ampacity clipping question as we have
not exceeded that value by anything significant (and I would say 0.4 A is
not significant).  We have installed multiple projects that are just over
the individual MPPT amp rating without needing to change any function of
the inverter.

The SMA inverters still operate well even if their technical support does
not.  My only complaint is sporadic, non-reproducible arc-fault events.

Matt


Matthew Partymiller
Solar Energy Solutions LLC
(877) 312-7456
matt at solar-energy-solutions.com
On Fri, June 3, 2016 11:24 am, frenergy wrote:
> Hey Folks,
>
>
> I'm afraid getting through to SMA service has gone the path
> of many others....how long can you wait and wait and.....  My question: the
> SB7000TL-US-22 is rated for up to 18 amps per MPPT input.  What
> happens at 18.4 amps?  Does it just clip some power and continue operating
> accepting the full rating of 18 amps? Is there a manual reset necessary?
>
> Thanks,
>
>
> 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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