[RE-wrenches] Adding similar but updated modules to same inverter

[Dave Click]

I think that the 230s required positive grounding, so you can't swap out 
the inverter for a TL unit. These two circuits in parallel will be fine 
for your MPPT, you'll have essentially the same voltages but slightly 
higher current in your new second string.

DKC

On 2013/7/12 19:27, August Goers wrote:
>
> Hi Wrenches,
>
> I have a client with a small system consisting of 6 SunPower 230s and 
> a SMA SB 3000. Anyway, he wants to add another 6 modules but the 
> closest we can get from SunPower these days is a 245. The new six 
> modules would go on a second string.
>
> Do you think that the slight difference in tracking voltage and 
> current will be significant enough to justify the cost of adding or 
> swapping the inverter? Here is the info for the modules:
>
> SunPower 230 WHT
>
> Vmpp    41.0 V
>
> Impp     5.61 A
>
> Voc        48.7 V
>
> Isc           5.99 A
>
> SunPower 245NE WHT
>
> Vmpp    40.5 V
>
> Impp     6.05 A
>
> Voc        48.8 V
>
> Isc           6.43 A
>
> I imagine that the tracker in the Sunny Boy will be a little off and 
> perhaps the result will be that both strings will be running a few 
> percent lower than they are capable of?
>
> Best, August
>
> *August Goers*
>
> Luminalt Energy Corporation
>
> o: 415.641.4000
>
> m: 415.559.1525
>
>
>
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