Solar Guppy - All Things Solar Forum

It is currently Thu Mar 28, 2024 7:45 pm GMT EthGMT

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 3 posts ] 
Author Message
 Post subject: ST25000UPG Inverter Production has dropped significantly
PostPosted: Thu Sep 17, 2009 12:47 pm GMT EthGMT 
Offline
Minnow
Minnow

Joined: Sat Feb 26, 2005 10:50 pm GMT EthGMT
Posts: 13
Hello,

I have a old ST 2500 Watt Inverter (XSTXR2500UPG) that has performed admirably the last 5 years. Lately its production has dropped by about 50% which seems to be due to multiple AC Voltage Faults and the associated 5 minute restarts throughout the day. When I have been able to catch it during one of its "faults", the message "AC NOT PRESENT" is on the LCD. When I measure the voltage and frequency on the Inverter side of the AC Breaker, everything is in spec as best I can measure, so I am very skeptical that is an actual voltage fault. Some time later the fault will clear and the Inverter will function as normal with the production very good.

Has anybody had a similar problem? Is there any chance of a loose connection somewhere inside the ST that I could check? I have not ruled out replacing the unit but for this site, the low voltage strings of the ST are actually ideal. I have 32 BP 75 Watt 12 Volt modules wired as 8 strings of 4 modules. There is significant shade from different sources throughout the day which may shut down a few strings at a time but the others keep producing. If I were to replace the ST with a GT2.8, I would have to wire is as 2 strings of 16 modules. Some shade with that configuration could take out 50% of the power output easily and I would not be much better off than where I am now.

Any info would be appreciated.


Top
 Profile  
 
 Post subject: Re: ST25000UPG Inverter Production has dropped significantly
PostPosted: Thu Sep 17, 2009 2:21 pm GMT EthGMT 
Offline
Red Cobra Delta Guppy
Red Cobra Delta Guppy
User avatar

Joined: Sun Jun 02, 2002 1:01 am GMT EndGMT
Posts: 1159
Location: Lakeland Florida
Id check all the connections to the breakers and the wires connections that go into the main board, the lugs can loosen over time and could cause intermittent issues


Top
 Profile  
 
 Post subject: Re: ST25000UPG Inverter Production has dropped significantly
PostPosted: Thu Sep 17, 2009 3:59 pm GMT EthGMT 
Offline
Minnow
Minnow

Joined: Sat Feb 26, 2005 10:50 pm GMT EthGMT
Posts: 13
Hi Solar-Guppy,

Thanks for the quick reply. I did check all connections up to the Main Board. I even bypassed the Breaker in the unit and disconnected the surge arrestor just to be safe. I measured good voltage on the terminal block on the Main Board right behind the Comm Board.

Have you ever seen this sympton in all your testing of the ST Inverters? Thanks for your help.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: Google [Bot] and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
cron
Powered by phpBB © 2000 - 2020 phpBB Group

phpBB SEO

© SGT 2002 - 2020 Solar Guppy