8048A with GSLC, FLEXnet DVand FM100’s - use battery sense?

Dual Input, 120/240, stainless steel form factor design for unsurpassed surge capability

8048A with GSLC, FLEXnet DVand FM100’s - use battery sense?

Postby clarkef on Wed Dec 05, 2018 9:19 pm

Just installed my GSLC 120/240PV which has the built in FLEXNet DC. I’m using multiple FM100 charge controllers.

My question relates to the use of the battery sense inputs in the FM100’s. Supposedly they are networked so what one FM100 senses the others copy. Today for the first time with everything running I noticed the FM100’s were showing a different voltage for the battery bank - about .3v higher than the FLEXNet DC battery reading (which is identical to my fluke at the batteries and at the buss bars in the GSLC. Before the Radian / GSLC, I did have twisted pair hooked up to the battery sense which made a noticeable improvement in battery voltage accuracy.

Shouldn’t the FM100’s take the FLEXNet DC voltages? If not, why not? What’s the sense of having a master DC monitoring system if the charge controllers don’t use it?
clarkef
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My RE system: Radian 8048A w/PV GSLC
FM100 CC x3
10KW of 72 cell panels (5S3P x2)
2000AH of Li-Ion modules @48v pending with BMS
Midnite Combiners, SPDs

Re: 8048A with GSLC, FLEXnet DVand FM100’s - use battery sen

Postby Gwendoly Espe on Thu Dec 06, 2018 4:21 am

Hello,

I didn't quite follow after
" (which is identical..."
Is the .3V higher that the FM100 is reading identical to the fluke or the FNDC reading is identical to the fluke meter? Either way I hope the following information helps answer your question.


In the manual it shows the priority for the system display voltage:

IMPORTANT:
The MATE3s system display shows the overall system voltage as measured at the battery
terminals of various devices. (See Figure 26 on page 35.) This voltage is used for generator
starting and other functions.
* If no other devices are present, it will show the reading of the FLEXmax 100. Unless:
* If OutBack inverters are present, the inverter voltage replaces the FLEXmax 100 as the
system voltage reading. Unless:
* If the FLEXmax 100 Battery Sense terminals are in use, this reading replaces the inverter
or the regular charge controller readings as the system voltage. Unless:
* The FLEXnet DC Battery Monitor is the highest priority and will replace the Battery Sense
reading as the system voltage.
The Battery Sense reading is still shown on the Charge Controller screen. (See Figure 27 on
page 36.) This reading is still used to adjust the FLEXmax 100 charging.


It also shares some benefits of the battery sense.
The Battery Sense function has several advantages apart from accurate battery readings.
* The more accurate charging may increase battery life.
* A single set of readings can be used by multiple FLEXmax 100 controllers.
* Conflict between controllers due to differing readings is eliminated.
* The need for calibration is eliminated. If Battery Sense is not in use, the user can calibrate the battery meter
at the charge controller’s main terminals. See page 50 and the system display literature for more information.
(If Battery Sense is in use, calibration changes are not needed and will have no effect.)



Mark goes into Batt Sense in this YouTube Video starting at 21:11
Gwendoly Espe
Applications Engineer


Alpha Technologies Inc. / OutBack Power Technologies
3767 Alpha Way Bellingham WA 98226 USA
http://www.alpha.com
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Gwendoly Espe
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Re: 8048A with GSLC, FLEXnet DVand FM100’s - use battery sen

Postby clarkef on Thu Dec 06, 2018 7:11 am

Gwendoly Espe wrote:Is the .3V higher that the FM100 is reading identical to the fluke or the FNDC reading is identical to the fluke meter? ]


Its .3V higher than the FLEXNet battery voltage / measured fluke battery voltage.

Sounds like I need to hook up one of the FM100’s either to the lugs in the GSLC or direct to the battery.

They are networked Gwendoly correct? Just hook up the primary and the others will get that reading over the hub?
clarkef
Forum Whiz
 
Posts: 33
Joined: Wed Oct 31, 2018 9:43 am
My RE system: Radian 8048A w/PV GSLC
FM100 CC x3
10KW of 72 cell panels (5S3P x2)
2000AH of Li-Ion modules @48v pending with BMS
Midnite Combiners, SPDs

Re: 8048A with GSLC, FLEXnet DVand FM100’s - use battery sen

Postby Gwendoly Espe on Thu Dec 06, 2018 8:35 am

* A single set of readings can be used by multiple FLEXmax 100 controllers.


Yes, the system will share the information to the other FM100s through a HUB.
Gwendoly Espe
Applications Engineer


Alpha Technologies Inc. / OutBack Power Technologies
3767 Alpha Way Bellingham WA 98226 USA
http://www.alpha.com
User avatar
Gwendoly Espe
Applications Engineering
 
Posts: 123
Joined: Wed Feb 22, 2017 11:04 am

Re: 8048A with GSLC, FLEXnet DVand FM100’s - use battery sen

Postby clarkef on Thu Dec 06, 2018 12:13 pm

Gwendoly Espe wrote:
* A single set of readings can be used by multiple FLEXmax 100 controllers.


Yes, the system will share the information to the other FM100s through a HUB.


Thank you.
clarkef
Forum Whiz
 
Posts: 33
Joined: Wed Oct 31, 2018 9:43 am
My RE system: Radian 8048A w/PV GSLC
FM100 CC x3
10KW of 72 cell panels (5S3P x2)
2000AH of Li-Ion modules @48v pending with BMS
Midnite Combiners, SPDs


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