PV Inverters module strings (Last Call) [RE-wrenches]

[Joel Davidson]

Dear Carl,
Thanks for the useful information which will be incorporated in the compiled list.
Perhaps someone from Uni-Solar or another designer using Uni-Solar would like to add
their perspective.
Best regards,
Joel Davidson

Carl Emerson wrote:

> Hullo Joel...
>
> Thanks for your efforts with the list.
>
> I want to assist in the exercise, but the point has been made that the list pretty
> much applies to a particular geographic area yet Trace is a global product.
>
> In our part of the world the roof modules from Canon Japan are very popular.
>
> I have already supplied detail for these and the matter has been overlooked.
>
> I quote my Email...
> =========================
> I notice how quick the Canon/Unisolar range has been discounted for use with the
> PV series inverters.
>
> I have done several array designs with these products.
>
> The EF2-64 'Econoflat' roof module will perform well with this inverter.
>
> The VOC max. at Zero degrees Celsius is under 600 Volts with a 27 module string.
>
> The MPPT remains within the window of 300-480 right up to a 70 degrees celsius
> module temperature.
>
> Please do not discount these products without being sure of their behavior.
>
> Please also note that the US64 has a much different MPPT curve and the
> Canon/Unisolar range cannot be assumed to fall into one spec.
>
> ========================
>
> I have been able to present this data with confidence because of personal
> experience and hard data.
>
> I am less able to present the case for the US64 or SSR range because I have no hard
> data as to how the MPPT behaves at different temperatures with these products. If
> any Wrench out there has this data I am willing to run the numbers and come up with
> a yes or no to their suitability.
>
> I am aware of the commercial separation of Canon and Unisolar however there still
> remains a lesser commercial link through a parent company.
>
> Are we clear about how the inverter will behave if the voltage window is exceeded.
> It is common for the MPPT design to simply shift the max. power point down and
> 'regulate'  if the upper limit is exceeded. This simply means a short term loss of
> potential production at the top end without harming the unit. The bottom end is
> generally not a problem as the inverter production simply drops out.
> So I think we need to understand the consequences of going beyond the window with
> this unit.
>
> My comment about the panels available next year was to indicate that the list will
> quickly be out of date unless it is under regular revision as new products appear.
> I know that there will be several new products soon.
>
> Lastly I would appreciate a copy of Johns spread sheet, I also applaud the approach
> of SMA....   Thanks John.
>
> Thanks again Joel...
>
> Carl Emerson
> Manager
> FREEPOWER LTD.  "Harnessing Natural Energy"  Auckland, NEW ZEALAND.
> Email: freepower at freepower.co.nz     Web: www.freepower.co.nz
>
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