Solar Guppy - All Things Solar Forum

It is currently Thu Dec 01, 2022 12:20 am GMT EstGMT

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 6 posts ] 
Author Message
 Post subject: Xantrex XW 6048 - Grid Support Mode Question
PostPosted: Thu Nov 05, 2009 9:38 pm GMT EthGMT 
Offline
Fish Eggs
Fish Eggs

Joined: Mon Aug 17, 2009 11:54 am GMT EthGMT
Posts: 6
I have my Xantrex unit set in grid support mode.
A few quick questions ....

Case 1
My SCC is actively harvesting and pulling in at least 600w.
I have my grid support volts set to 51.2, and my batteries are at 52 volts.
The inverter is now using battery power to augment any sub-panel usage above 600w, correct?

Case 2
My SCC is actively harvesting and pulling in 100w.
I have my grid support volts set to 51.2, and my batteries are at 51 volts.
The inverter is now using AC1 to augment any sub-panel usage above 100w, correct?

Case 3
My SCC has now shut down after a normal day and I am not harvesting.
I have my grid support volts set to 51.2, and my batteries are at 51 volts.
The inverter is now using AC1 to augment any sub-panel usage?

Thank you for your assistance. I am still getting used to my new system.

David


Top
 Profile  
 
 Post subject: Re: Xantrex XW 6048 - Grid Support Mode Question
PostPosted: Sun Nov 08, 2009 9:10 pm GMT EthGMT 
Offline
Fish Eggs
Fish Eggs

Joined: Mon Nov 02, 2009 9:52 pm GMT EndGMT
Posts: 1
Essentially correct, but you need to raise the grid support voltage or else you'll harm your batteries.

It takes a bit of experimentation to get the correct grid support voltage. The best starting point is approximately the manufacturer's recommended "Float" voltage. You'll have to monitor the system's performance over a few clear sunny days, paying careful attention to how early in the day the voltage rises back to the grid support voltage. A few times disconnecting the AC input circuit breaker to verify that the batteries are maintaining capacity is also helping.

If the batteries immediately rise to the grid support voltage, lower it by a single step, then see how the system behaves the next time. As soon as it takes a little longer than before to reach the grid support voltage, increase the value by .1 volts.

What you're doing is minimizing the amount of power that's wasted on keeping the batteries charged, while maximizing the available capacity.


Top
 Profile  
 
 Post subject: Re: Xantrex XW 6048 - Grid Support Mode Question
PostPosted: Thu Nov 12, 2009 9:01 am GMT EthGMT 
Offline
Fish Eggs
Fish Eggs

Joined: Mon Aug 17, 2009 11:54 am GMT EthGMT
Posts: 6
Thanks. I'll give it a whirl.


Top
 Profile  
 
 Post subject: Re: Xantrex XW 6048 - Grid Support Mode Question
PostPosted: Thu Jan 14, 2010 10:02 am GMT EthGMT 
Offline
Fish Eggs
Fish Eggs

Joined: Mon Aug 17, 2009 11:54 am GMT EthGMT
Posts: 6
Now a while later ....

I now have the following set:
Grid Support at 52.8
MPPT Recharge at 52.2
6048 Recharge at 49.9 (Just as a backup to recharge after an outage)

The only oddity I see now is that when I am getting full power from my array (700w +) my Bogart/Trimetric meter is showing the amps level fluctuating quite a bit on a 20 second or so inverval at times. It will sometimes cycle from a varying level of neg 3-7 amps to pos 3-7 amps. As near as I can tell, the MPPT charger is staying in bulk charge mode, pv voltage, pv watts, and system load are all constant at the time this happens. (Battery bank is also in a fully charged state)

I have Concorde sunXtender batteries and the float is supposed to be 52.8-53.5v.


Top
 Profile  
 
 Post subject: Re: Xantrex XW 6048 - Grid Support Mode Question
PostPosted: Thu Jan 14, 2010 3:36 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
At lower sell power levels and the current firmware the XW-6048 will ramp-up and down the sell wattage, the net is the same as if it was a constant rate. There should be new firm for the XW to minimize the will sell hunting, not sure exactly when it will be released


Top
 Profile  
 
 Post subject: Re: Xantrex XW 6048 - Grid Support Mode Question
PostPosted: Thu Jan 14, 2010 6:59 pm GMT EthGMT 
Offline
Fish Eggs
Fish Eggs

Joined: Mon Aug 17, 2009 11:54 am GMT EthGMT
Posts: 6
Thanks. It makes sense now.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users 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