Fx80 charge setting

Discussion about the FM100, FM80, and FM60 Charge Controllers

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Jim20
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Posts: 38
Joined: Sat Feb 24, 2018 8:03 am
My RE system: Outback: Off Grid
1 - Outback radian GS8048A
1 - EcoGen 15k
36 - SolarTech Quantum 295W = 10620w
16 - Trojan SPRE 06 415 batteries in 2 48V banks
1 - MATE3s
2 - FM80-150VDC
1 - Flexnet DC
1 - EnviroStor 119SKE Indirect Solar water heater controlled with a
Crydom D2425 relay that shuts power off at night from FM80.
1 - House air exchanger with a Crydom D2425 relay that shuts power off at night from FM80.
1 - Central Boiler CL 5036
Location: Groton, NH

Fx80 charge setting

Post by Jim20 » Fri Nov 23, 2018 2:20 pm

I think my settings are off.

In my FX80 battery charge settings it has current limit. Is this limit the incoming limit from the panels which should be 80 or is this the limit that is charging your batteries?

I set this to my c20 rate of 49 and my system will not bring in any more amps than 49 and takes a long time to charge the batteries. I think this needs to be changed back to 80. If so where do I put the C20 so that I do not over charge the batteries?
Living Off Grid is Awesome!

James Bilodeau
PO box 157
Hebron NH 03241
jbilodeau3160@gmail.com

petertearai
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Re: Fx80 charge setting

Post by petertearai » Fri Nov 23, 2018 2:37 pm

the limit is the amps out to batterys .
I think you can increase the amps a little
2220 pv. fm80. 12 times 2 volt exc shoto lead carbon 450 AH 24 volts. victron battery monitor. outback fxr 2000 watt inverter

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Re: Fx80 charge setting

Post by SandyP » Fri Nov 23, 2018 6:24 pm

Jim20 wrote:...If so where do I put the C20 so that I do not over charge the batteries?
You have the correct setting in your FM80 (ie 49amps) as specified by the Trojan to limit the maximum charge received when solar charging. Note, if you use a generator via your inverter to charge your batteries you will also need to limit the maximum battery charge amps from using the inverter charger.

Note: The Trojan spec sheet for your batteries says "*If charging time is limited contact Trojan Technical Support for assistance"

petertearai
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Re: Fx80 charge setting

Post by petertearai » Fri Nov 23, 2018 6:39 pm

yes 13% is the max so theoretically 49 amps , but most systems will have an existing load , This of course will vary...... but you can add this to your 49 amps .
2220 pv. fm80. 12 times 2 volt exc shoto lead carbon 450 AH 24 volts. victron battery monitor. outback fxr 2000 watt inverter

petertearai
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Location: NewZealand North Island

Re: Fx80 charge setting

Post by petertearai » Fri Nov 23, 2018 6:44 pm

also if you think your not getting a full charge , maybe need to extend the absorb time .
Check your settings for absorb voltage and float . What is the SG you get to at end of day? , do you regularly get to floating ?
2220 pv. fm80. 12 times 2 volt exc shoto lead carbon 450 AH 24 volts. victron battery monitor. outback fxr 2000 watt inverter

Jim20
Forum Whiz
Posts: 38
Joined: Sat Feb 24, 2018 8:03 am
My RE system: Outback: Off Grid
1 - Outback radian GS8048A
1 - EcoGen 15k
36 - SolarTech Quantum 295W = 10620w
16 - Trojan SPRE 06 415 batteries in 2 48V banks
1 - MATE3s
2 - FM80-150VDC
1 - Flexnet DC
1 - EnviroStor 119SKE Indirect Solar water heater controlled with a
Crydom D2425 relay that shuts power off at night from FM80.
1 - House air exchanger with a Crydom D2425 relay that shuts power off at night from FM80.
1 - Central Boiler CL 5036
Location: Groton, NH

Re: Fx80 charge setting

Post by Jim20 » Fri Nov 23, 2018 7:01 pm

petertearai wrote:yes 13% is the max so theoretically 49 amps , but most systems will have an existing load , This of course will vary...... but you can add this to your 49 amps .
Ok so if my existing load is 4 amps, I can go with say 52 to be safe. That will help I think.
Living Off Grid is Awesome!

James Bilodeau
PO box 157
Hebron NH 03241
jbilodeau3160@gmail.com

Jim20
Forum Whiz
Posts: 38
Joined: Sat Feb 24, 2018 8:03 am
My RE system: Outback: Off Grid
1 - Outback radian GS8048A
1 - EcoGen 15k
36 - SolarTech Quantum 295W = 10620w
16 - Trojan SPRE 06 415 batteries in 2 48V banks
1 - MATE3s
2 - FM80-150VDC
1 - Flexnet DC
1 - EnviroStor 119SKE Indirect Solar water heater controlled with a
Crydom D2425 relay that shuts power off at night from FM80.
1 - House air exchanger with a Crydom D2425 relay that shuts power off at night from FM80.
1 - Central Boiler CL 5036
Location: Groton, NH

Re: Fx80 charge setting

Post by Jim20 » Fri Nov 23, 2018 7:09 pm

petertearai wrote:also if you think your not getting a full charge , maybe need to extend the absorb time .
Check your settings for absorb voltage and float . What is the SG you get to at end of day? , do you regularly get to floating ?
My SG is high 1.270 ish, absorb and float is ok. Yes I get to float usually within 3-3.5 hrs.

Here is how things went down today. We had full sun so we started laundry and the dishwasher thinking I would have enough to run it all and charge the batteries. I had 5300w but it would not keep up with it due to the limit of my 49 AAC setting.
Living Off Grid is Awesome!

James Bilodeau
PO box 157
Hebron NH 03241
jbilodeau3160@gmail.com

Jim20
Forum Whiz
Posts: 38
Joined: Sat Feb 24, 2018 8:03 am
My RE system: Outback: Off Grid
1 - Outback radian GS8048A
1 - EcoGen 15k
36 - SolarTech Quantum 295W = 10620w
16 - Trojan SPRE 06 415 batteries in 2 48V banks
1 - MATE3s
2 - FM80-150VDC
1 - Flexnet DC
1 - EnviroStor 119SKE Indirect Solar water heater controlled with a
Crydom D2425 relay that shuts power off at night from FM80.
1 - House air exchanger with a Crydom D2425 relay that shuts power off at night from FM80.
1 - Central Boiler CL 5036
Location: Groton, NH

Re: Fx80 charge setting

Post by Jim20 » Fri Nov 23, 2018 7:14 pm

SandyP wrote:
Jim20 wrote:...If so where do I put the C20 so that I do not over charge the batteries?
You have the correct setting in your FM80 (ie 49amps) as specified by the Trojan to limit the maximum charge received when solar charging. Note, if you use a generator via your inverter to charge your batteries you will also need to limit the maximum battery charge amps from using the inverter charger.

Note: The Trojan spec sheet for your batteries says "*If charging time is limited contact Trojan Technical Support for assistance"
Yes, the generator is set the same. My limit with the system is 54.6. my mpp is 9.1 for 6 sets.
Living Off Grid is Awesome!

James Bilodeau
PO box 157
Hebron NH 03241
jbilodeau3160@gmail.com

petertearai
Forum Guru
Posts: 397
Joined: Fri Aug 06, 2010 4:35 pm
My RE system: 2220 watt pv, fm80, outback fxr 2000 watt inverter. Shoto 12 times 2 volt exc400 lead carbon batterys 24 volt system victron battery moniter. optics RE
Location: NewZealand North Island

Re: Fx80 charge setting

Post by petertearai » Fri Nov 23, 2018 7:18 pm

yep add that 4 amps . Look at the northern Arizona solar forum , some say up to 20% ok .. Of course that is not what manufacture recommends . However if you have an RTS it looks like a little more than 13% may be ok
2220 pv. fm80. 12 times 2 volt exc shoto lead carbon 450 AH 24 volts. victron battery monitor. outback fxr 2000 watt inverter

Jim20
Forum Whiz
Posts: 38
Joined: Sat Feb 24, 2018 8:03 am
My RE system: Outback: Off Grid
1 - Outback radian GS8048A
1 - EcoGen 15k
36 - SolarTech Quantum 295W = 10620w
16 - Trojan SPRE 06 415 batteries in 2 48V banks
1 - MATE3s
2 - FM80-150VDC
1 - Flexnet DC
1 - EnviroStor 119SKE Indirect Solar water heater controlled with a
Crydom D2425 relay that shuts power off at night from FM80.
1 - House air exchanger with a Crydom D2425 relay that shuts power off at night from FM80.
1 - Central Boiler CL 5036
Location: Groton, NH

Re: Fx80 charge setting

Post by Jim20 » Fri Nov 23, 2018 7:19 pm

petertearai wrote:yep add that 4 amps . Look at the northern Arizona solar forum , some say up to 20% ok .. Of course that is not what manufacture recommends . However if you have an RTS it looks like a little more than 13% may be ok
Thank you. That will help.
Living Off Grid is Awesome!

James Bilodeau
PO box 157
Hebron NH 03241
jbilodeau3160@gmail.com

Jim20
Forum Whiz
Posts: 38
Joined: Sat Feb 24, 2018 8:03 am
My RE system: Outback: Off Grid
1 - Outback radian GS8048A
1 - EcoGen 15k
36 - SolarTech Quantum 295W = 10620w
16 - Trojan SPRE 06 415 batteries in 2 48V banks
1 - MATE3s
2 - FM80-150VDC
1 - Flexnet DC
1 - EnviroStor 119SKE Indirect Solar water heater controlled with a
Crydom D2425 relay that shuts power off at night from FM80.
1 - House air exchanger with a Crydom D2425 relay that shuts power off at night from FM80.
1 - Central Boiler CL 5036
Location: Groton, NH

Re: Fx80 charge setting

Post by Jim20 » Fri Nov 23, 2018 7:46 pm

petertearai wrote:also if you think your not getting a full charge , maybe need to extend the absorb time .
Check your settings for absorb voltage and float . What is the SG you get to at end of day? , do you regularly get to floating ?
I have my absorb time at 2 hrs. Trojan says Max is 4 hrs. Is less better for the batteries or should I move it up to 3-3.5 hrs?
Living Off Grid is Awesome!

James Bilodeau
PO box 157
Hebron NH 03241
jbilodeau3160@gmail.com

petertearai
Forum Guru
Posts: 397
Joined: Fri Aug 06, 2010 4:35 pm
My RE system: 2220 watt pv, fm80, outback fxr 2000 watt inverter. Shoto 12 times 2 volt exc400 lead carbon batterys 24 volt system victron battery moniter. optics RE
Location: NewZealand North Island

Re: Fx80 charge setting

Post by petertearai » Fri Nov 23, 2018 10:41 pm

absorb time is not an exact science . Idealy absorb should stop once the charging amps at the end of the absorb time has been the same low value for 15 minutes or so .
Or the SG has reached what the battery specs say is 100% charged SG .
So it takes a bit of looking at .
2220 pv. fm80. 12 times 2 volt exc shoto lead carbon 450 AH 24 volts. victron battery monitor. outback fxr 2000 watt inverter

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Kurt Lundquist
Alpha Energy Engineering
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Re: Fx80 charge setting

Post by Kurt Lundquist » Tue Nov 27, 2018 7:54 am

I would bump Absorb up to 4 hours. I would also call Trojan and ask what the concern would be if the batteries occasionally had a ~150-160A bulk charge. You have two banks in parallel so the 49A output is a total of 98 amps. Usually, when you hit batteries with a high charge current the voltage quickly rises to Absorb which starts to self-regulate the charge rate. PV typically provides a gradual charge rate anyway as you typically have a few hours in the morning before the array is producing anywhere close to max power. My guess is Trojan will tell you to watch the water consumption. The higher charge rate will mean the battery bank needs to spend more time in Absorb to achieve a full charge.

If you get in touch with Trojan let us know what they say.

-Kurt
Kurt Lundquist
Renewable Energy Project Engineer
http://alphaenergy.us/

Jim20
Forum Whiz
Posts: 38
Joined: Sat Feb 24, 2018 8:03 am
My RE system: Outback: Off Grid
1 - Outback radian GS8048A
1 - EcoGen 15k
36 - SolarTech Quantum 295W = 10620w
16 - Trojan SPRE 06 415 batteries in 2 48V banks
1 - MATE3s
2 - FM80-150VDC
1 - Flexnet DC
1 - EnviroStor 119SKE Indirect Solar water heater controlled with a
Crydom D2425 relay that shuts power off at night from FM80.
1 - House air exchanger with a Crydom D2425 relay that shuts power off at night from FM80.
1 - Central Boiler CL 5036
Location: Groton, NH

Re: Fx80 charge setting

Post by Jim20 » Tue Nov 27, 2018 12:41 pm

Kurt Lundquist wrote:I would bump Absorb up to 4 hours. I would also call Trojan and ask what the concern would be if the batteries occasionally had a ~150-160A bulk charge. You have two banks in parallel so the 49A output is a total of 98 amps. Usually, when you hit batteries with a high charge current the voltage quickly rises to Absorb which starts to self-regulate the charge rate. PV typically provides a gradual charge rate anyway as you typically have a few hours in the morning before the array is producing anywhere close to max power. My guess is Trojan will tell you to watch the water consumption. The higher charge rate will mean the battery bank needs to spend more time in Absorb to achieve a full charge.

If you get in touch with Trojan let us know what they say.

-Kurt
Interesting. I will give them a call. Thx.
Living Off Grid is Awesome!

James Bilodeau
PO box 157
Hebron NH 03241
jbilodeau3160@gmail.com

Jim20
Forum Whiz
Posts: 38
Joined: Sat Feb 24, 2018 8:03 am
My RE system: Outback: Off Grid
1 - Outback radian GS8048A
1 - EcoGen 15k
36 - SolarTech Quantum 295W = 10620w
16 - Trojan SPRE 06 415 batteries in 2 48V banks
1 - MATE3s
2 - FM80-150VDC
1 - Flexnet DC
1 - EnviroStor 119SKE Indirect Solar water heater controlled with a
Crydom D2425 relay that shuts power off at night from FM80.
1 - House air exchanger with a Crydom D2425 relay that shuts power off at night from FM80.
1 - Central Boiler CL 5036
Location: Groton, NH

Re: Fx80 charge setting

Post by Jim20 » Thu Nov 29, 2018 7:12 am

Kurt,

James from trojan tech support said that you can charge the batteries up to 150 amps. That is 20% of the battery bank capacity as long as the batteries do not get over 100 deg. 754ah.

The two charge controllers can be set to 50 or max at 60 to get my batteries charged. My system maxes out at 58amps so i set it at 60.

Yes, always keep an eye on water consumption.
Living Off Grid is Awesome!

James Bilodeau
PO box 157
Hebron NH 03241
jbilodeau3160@gmail.com

User avatar
Kurt Lundquist
Alpha Energy Engineering
Posts: 1447
Joined: Tue May 31, 2011 7:23 am
My RE system: VFX3524, Mate3, 200Ah 24V AGM Battery Bank
Location: Arlington, WA

Re: Fx80 charge setting

Post by Kurt Lundquist » Thu Nov 29, 2018 8:36 am

Thanks for letting us know Jim! Did he say that it is 150A per battery string or did he say 75A per string and you can go to 150A because you have 2 strings?
Jim20 wrote:The two charge controllers can be set to 50 or max at 60 to get my batteries charged. My system maxes out at 58amps so i set it at 60.
If the charge controllers are FM80 you can set them up to 80A. 75A per controller would put you at 150A. If you typically have 500+ watts of load during the day I wouldn't bother limiting the controllers. From your profile, it looks like you have loads that turn on in the day so they will likely suck up any extra amps beyond what the battery bank can handle. Keep an eye on the FLEXnet DC amps to the battery and the battery temp in the inverter menu (37┬░C is ~100┬░F). If you do not see battery temp in the inverter menu you need to install the OutBack RTS battery temp sensor. I bet you will find that limiting the controllers isn't necessary.

At 5310W your PV arrays are a bit oversized for the FM80. To maintain the controller warranties your 36 module array should be split into 3 arrays of 12 modules each with a 3rd FM80 in the mix. 5310W/48V = 110Amps. OutBack recommends 4.0kW max PV for an FM80 with a 48V battery bank. As an alternative, you could just swap the FM80s with FM100 controllers. Since you are off-grid at the very least I would get a spare FM80 to have as a backup. Your PV array is powerful enough to smoke a controller if you get edge of cloud effect on a cold day.

-Kurt
Kurt Lundquist
Renewable Energy Project Engineer
http://alphaenergy.us/

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