new 4Kwp system - components debate (Sunpower, SolarWorld or PhonoSolar??)

[tump]

FYI, this system is being installed in a hot climate so using a module that has a good temp coefficient is important. Sunpower modules work well in high temps. If your "intergrator" is a Sunpower dealer then you should be able to get a "Smart Pack" price which includes everything nessesary for the install, if it is a roof mount. ( I mean everything, although I am not sure about delivery out of the USA)
Sunpower no longer uses Xantrex/Schnider inverters. SMA has ALWAYS been a partner w/ Sunpower, SMA is your only choice for a quality product & support AND they are field settable for either + or - ground. When your order comes from a SP dealer then the inverter is already set for positive ground.

[noammo]

Thanks tump, you are right about the temp coefficient, but do you know or understand these details regarding the two other alternatives?
The problem with the Sunpower modules is that I can't use transformerless inverters with them, and the TL inverters are known to be much more efficient.. and more modern technologically!
BTW, the prices I quoted include all the system including mounts etc.
hmm.. I still can't decide...

[Mike90250]

When the Xantrex GT 5000 (w/transformer) is 96% efficient, just HOW MUCH MORE can you go? (avaib w +Gnd)