Posted by GSL94705 on December 11, 2005, 11:36 pm
I have had two Installers tell me two different things and am not sure
which is correct.
I want to put PV panels on a south and a western facing roof (25 deg
slope which is close to ideal.)
One installer said I would need a Sharp JH-3500U Inverter which is
really three separate inverters packaged as one. So each face of the
roof is optimized independently. She said that with other inverters,
all the strings must be in the same orientation.
A second installer said that I could use another inverter (a PV Powered
2000). He said this inverter optimizes the total power, but both
strings will be operating with the same parameters. He said since
voltage changes very little with light exposure, the loss is relatively
small.
The PV Powered inverter is cheaper, more efficient and has a 10 yr. vs
(5yr) guarantee.
I can't tell from the respective web sites who is correct?
Does someone know?
Thanks
Posted by Solar Guppy on December 12, 2005, 11:11 am
We have discussed this at
www.solar-guppy.com/forum
>I have had two Installers tell me two different things and am not sure
> which is correct.
> I want to put PV panels on a south and a western facing roof (25 deg
> slope which is close to ideal.)
> One installer said I would need a Sharp JH-3500U Inverter which is
> really three separate inverters packaged as one. So each face of the
> roof is optimized independently. She said that with other inverters,
> all the strings must be in the same orientation.
> A second installer said that I could use another inverter (a PV Powered
> 2000). He said this inverter optimizes the total power, but both
> strings will be operating with the same parameters. He said since
> voltage changes very little with light exposure, the loss is relatively
> small.
> The PV Powered inverter is cheaper, more efficient and has a 10 yr. vs
> (5yr) guarantee.
> I can't tell from the respective web sites who is correct?
> Does someone know?
> Thanks
>
Posted by GSL94705 on December 12, 2005, 4:06 pm
I've spent about 45 minutes looking and didn't find the discussion.
Can you be more specific.
Nice forum though.
Posted by Solar Guppy on December 12, 2005, 4:47 pm
http://www.solar-guppy.com/forum/viewtopic.php?tf&highlight=string
> I've spent about 45 minutes looking and didn't find the discussion.
> Can you be more specific.
> Nice forum though.
>
Posted by sddasf on December 15, 2005, 10:41 pm
GSL94705 wrote:
> I have had two Installers tell me two different things and am not sure
> which is correct.
>
> I want to put PV panels on a south and a western facing roof (25 deg
> slope which is close to ideal.)
>
> One installer said I would need a Sharp JH-3500U Inverter which is
> really three separate inverters packaged as one. So each face of the
> roof is optimized independently. She said that with other inverters,
> all the strings must be in the same orientation.
>
> A second installer said that I could use another inverter (a PV Powered
> 2000). He said this inverter optimizes the total power, but both
> strings will be operating with the same parameters. He said since
> voltage changes very little with light exposure, the loss is relatively
> small.
>
> The PV Powered inverter is cheaper, more efficient and has a 10 yr. vs
> (5yr) guarantee.
>
> I can't tell from the respective web sites who is correct?
>
> Does someone know?
>
> Thanks
>
What you want to look at is the AC rated watts out of the system. We use
PV pwered inverters for a several reasons. First, they carry the 10
warranty. Second, they are field serviceable since they have daughter
boards that can be easily replaced. They are also made in the good ol
USA. Finally, the PVP inverters have are passively cooled which keeps
things nice and clean on the inside. Having installed hundreds of
Fronius and Sunny Boy inverters, the PVP inverters are a smarter wat to go.
John
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> which is correct.
> I want to put PV panels on a south and a western facing roof (25 deg
> slope which is close to ideal.)
> One installer said I would need a Sharp JH-3500U Inverter which is
> really three separate inverters packaged as one. So each face of the
> roof is optimized independently. She said that with other inverters,
> all the strings must be in the same orientation.
> A second installer said that I could use another inverter (a PV Powered
> 2000). He said this inverter optimizes the total power, but both
> strings will be operating with the same parameters. He said since
> voltage changes very little with light exposure, the loss is relatively
> small.
> The PV Powered inverter is cheaper, more efficient and has a 10 yr. vs
> (5yr) guarantee.
> I can't tell from the respective web sites who is correct?
> Does someone know?
> Thanks
>