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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