FM80 goes silent; MX60 still charging

Discussion about the FM Extreme, FM60 and FM80 Charge Controllers

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FM80 goes silent; MX60 still charging

Postby Mike Curran on Tue Feb 13, 2018 9:21 am

We'll we finally got a couple of clear, cold sunny days, but for some reason my FM80 is going into "silent" mode mid-morning while my MX60 continues to pull in watts. When I see this I force bulk the FM80 but I shouldn't have to be doing this. Both CC's are in grid tie mode and I have charge coordination enabled. Any ideas why this is happening? Here are the Mate3 Global Charge settings:
Screenshot_20180213-110419.jpg

Thanks in advance!
Edit: I think I know the cause: I'm getting a "high AC input warning" and that seems to be knocking the FM80 off of grid-tie mode. Don't know why it's not affecting the MX60, tho'. Thoughts?

The other thing that I've changed (and just now changed back) is the Mate3 auto reboot interval. I had disabled it before this started happening. I've re-enabled, but don't really think that's related to this issue.
Mike Curran
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My RE system: Outback:
- 8 (2x4) Evergreen 180's into one MX60
- 6 (2×3) ALEO S79-300's into one FM80
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC
- 12 Surrette/Rolls 2V x 1766Ah
- Hub10.3, Mate3, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar:
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied.

Re: FM80 goes silent; MX60 still charging

Postby Mike Curran on Wed Feb 14, 2018 9:50 am

Re-enabling auto reboot did not fix. FM80 still goes silent while MX60 keeps on keeping on. No ideas?
Mike Curran
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Posts: 470
Joined: Sat Aug 28, 2004 6:28 pm
Location: Chagrin Falls, Ohio
My RE system: Outback:
- 8 (2x4) Evergreen 180's into one MX60
- 6 (2×3) ALEO S79-300's into one FM80
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC
- 12 Surrette/Rolls 2V x 1766Ah
- Hub10.3, Mate3, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar:
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied.

Re: FM80 goes silent; MX60 still charging

Postby gtarolli on Wed Feb 14, 2018 3:45 pm

If you batteries are charged and you are past Absorb mode and into Float mode, one charge controller is often enough to maintain the float voltage and so the other goes silent. Mine does this every day. So check and see what your current charging mode is, e.g. Bulk, Absorb, Float, EQ, Silent ... if one is in Float and one is Silent that is just fine. If a large load comes along the one that is Silent should eventually come out of that mode if the other charge controller alone cannot supply the load. You can also check your event log and see if/when the charge controllers change modes
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Re: FM80 goes silent; MX60 still charging

Postby Mike Curran on Wed Feb 14, 2018 4:30 pm

Thanks for your reply. Your explanation makes sense, but my system is grid-tied. So as long as the sun is shining and my batteries have been "topped off" for the day (which they were) then both charge controllers should keep pushing watts to the grid.

I thought maybe getting the high AC input voltage warning disabled my grid-tie, but if that were the case seems like both CC's should've gone silent, not just the FM80. And the MX60 was still selling to the grid, not just maintaining float voltage.

Another puzzle is that I have charge coordination enabled so they should be working in sync.
Mike Curran
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Posts: 470
Joined: Sat Aug 28, 2004 6:28 pm
Location: Chagrin Falls, Ohio
My RE system: Outback:
- 8 (2x4) Evergreen 180's into one MX60
- 6 (2×3) ALEO S79-300's into one FM80
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC
- 12 Surrette/Rolls 2V x 1766Ah
- Hub10.3, Mate3, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar:
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied.

Re: FM80 goes silent; MX60 still charging

Postby gtarolli on Wed Feb 14, 2018 4:39 pm

Oops, I forgot I am off-grid and you are in grid-tie mode. I also have charge coordination enabled and I still have one controller go silent when one is in Float mode. I wonder if perhaps this happens even in your system BEFORE you start selling to the grid, i.e. I am not 100% sure how the system works but I would suspect all the PV output would go to the batteries until they are charged, at which time one controller might go Silent and if there is a delay before you start selling to the grid, then perhaps it isn't smart enough to kick the Silent controller out of that mode? Is there a delay or something before the system switches from charging batteries to selling to the grid?
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- 21 (7x3) SolarWorld 300w (6300w)
- 5 SimpliPhi 3.4 kWh LI batteries (335ah)
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Re: FM80 goes silent; MX60 still charging

Postby Mike Curran on Wed Feb 14, 2018 5:19 pm

Here's a couple screen shots from my Tigo system showing that my FM80 was putting out before dropping off one minute later.
20180214_190134.jpg

Screenshot_20180214-190741.jpg

I end up having to manually put both charge controllers into bulk mode and then all's fine for the rest of the day.
Mike Curran
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Posts: 470
Joined: Sat Aug 28, 2004 6:28 pm
Location: Chagrin Falls, Ohio
My RE system: Outback:
- 8 (2x4) Evergreen 180's into one MX60
- 6 (2×3) ALEO S79-300's into one FM80
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC
- 12 Surrette/Rolls 2V x 1766Ah
- Hub10.3, Mate3, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar:
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied.

Re: FM80 goes silent; MX60 still charging

Postby gtarolli on Wed Feb 14, 2018 5:38 pm

It would be useful to post your Event History log for the day - as that logs the mode changes, e.g. Bulk to Absorb , Absorb to Not Charging etc. It might shed some light on the matter.
gtarolli
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- 1 GS8048A, Mate3, FlexNetDC, Hub10.3
- 2 FLEXmax 80
- 21 (7x3) SolarWorld 300w (6300w)
- 5 SimpliPhi 3.4 kWh LI batteries (335ah)
- 1 Honda 3000 generator + one spare

Re: FM80 goes silent; MX60 still charging

Postby Mike Curran on Wed Feb 14, 2018 8:08 pm

Here's the log for the time frame where everything happened. Note the latest event (topmost item, 11:26) it's where I manually forced the bulk cycle. The earliest event (10:36) is when charge parameters were met, allowing grid-tie selling to begin. I think the 2 gateway device events were my Mate3 auto-rebooting.
Screenshot_20180214-215356.jpg
Mike Curran
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Posts: 470
Joined: Sat Aug 28, 2004 6:28 pm
Location: Chagrin Falls, Ohio
My RE system: Outback:
- 8 (2x4) Evergreen 180's into one MX60
- 6 (2×3) ALEO S79-300's into one FM80
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC
- 12 Surrette/Rolls 2V x 1766Ah
- Hub10.3, Mate3, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar:
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied.

Re: FM80 goes silent; MX60 still charging

Postby gtarolli on Wed Feb 14, 2018 10:28 pm

I notice you never went into Absorb mode? What are your Absorb and Float voltages set to (in each charge controller)? And your Absorb time?
Also what is your sell voltage set to? There's also a reconnection delay timer. I am wondering if perhaps the selling doesn't begin until after your are in Float mode? If that is the case perhaps changing things so selling begins before Float mode begins (e.g. setting the Absorb time to be longer than the reconnection delay so that selling begins during the Absorb cycle) will help because if you are selling before entering Float mode then maybe the FM80 won't go silent.
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- 1 GS8048A, Mate3, FlexNetDC, Hub10.3
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- 21 (7x3) SolarWorld 300w (6300w)
- 5 SimpliPhi 3.4 kWh LI batteries (335ah)
- 1 Honda 3000 generator + one spare

Re: FM80 goes silent; MX60 still charging

Postby Mike Curran on Thu Feb 15, 2018 7:23 am

gtarolli wrote:I notice you never went into Absorb mode? What are your Absorb and Float voltages set to (in each charge controller)? And your Absorb time?
Also what is your sell voltage set to? There's also a reconnection delay timer. I am wondering if perhaps the selling doesn't begin until after your are in Float mode? If that is the case perhaps changing things so selling begins before Float mode begins (e.g. setting the Absorb time to be longer than the reconnection delay so that selling begins during the Absorb cycle) will help because if you are selling before entering Float mode then maybe the FM80 won't go silent.

Sorry, here's the earlier portion of the log showing bulk/absorb starting at 8:09:
Screenshot_20180215-090555.jpg

Being grid-tied and floating most all the time, my system doesn't do a normal prolonged daily absorb cycle like yours probably does. Instead, it does a daily cycle up to absorb voltage (29.4V) for 5 minutes (I set this), once this happens the system is permitted to sell (26.8V). This is a function of the FNDC called "auto grid-tie control". Also after this happens, the grid-tie mode function of my 2 charge controllers raises the float voltage (normally 26.4V) to equal absorb voltage to force my system up to the sell voltage.
Screenshot_20180215-092136.jpg
Mike Curran
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Posts: 470
Joined: Sat Aug 28, 2004 6:28 pm
Location: Chagrin Falls, Ohio
My RE system: Outback:
- 8 (2x4) Evergreen 180's into one MX60
- 6 (2×3) ALEO S79-300's into one FM80
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC
- 12 Surrette/Rolls 2V x 1766Ah
- Hub10.3, Mate3, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar:
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied.

Re: FM80 goes silent; MX60 still charging

Postby Mike Curran on Thu Feb 15, 2018 7:43 am

gtarolli wrote:I notice you never went into Absorb mode? What are your Absorb and Float voltages set to (in each charge controller)? And your Absorb time?
Also what is your sell voltage set to? There's also a reconnection delay timer. I am wondering if perhaps the selling doesn't begin until after your are in Float mode? If that is the case perhaps changing things so selling begins before Float mode begins (e.g. setting the Absorb time to be longer than the reconnection delay so that selling begins during the Absorb cycle) will help because if you are selling before entering Float mode then maybe the FM80 won't go silent.

Sorry, here's the earlier portion of the log showing bulk/absorb starting at 8:09:
Screenshot_20180215-090555.jpg

Being grid-tied and floating most all the time, my system doesn't do a normal prolonged daily absorb cycle like yours probably does. Instead, it does a daily cycle up to absorb voltage (29.4V) for 5 minutes (I set this), once this happens the system is permitted to sell (26.8V). This is a function of the FNDC called "auto grid-tie control". Also after this happens, the grid-tie mode function of my 2 charge controllers raises the float voltage (normally 26.4V) to equal absorb voltage to force my system up to the sell voltage, as described here:
Screenshot_20180215-092136.jpg

This is where I think the issue lies. Note it says "The charge controller’s Float voltage returns to normal any time the inverter enters PassThru or Silent modes." Well, this is happening when I get the high AC input voltage warning (normal for my area this time of year, btw). What I don't understand is why only one of the 2 CC's goes to float (in this case silent). Maybe they're both in Float but the MX is leading while the FM80 goes silent??? If you think this makes sense then maybe it's the answer...

Thanks for bearing with me - Mike
Mike Curran
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Posts: 470
Joined: Sat Aug 28, 2004 6:28 pm
Location: Chagrin Falls, Ohio
My RE system: Outback:
- 8 (2x4) Evergreen 180's into one MX60
- 6 (2×3) ALEO S79-300's into one FM80
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC
- 12 Surrette/Rolls 2V x 1766Ah
- Hub10.3, Mate3, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar:
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied.

Re: FM80 goes silent; MX60 still charging

Postby gtarolli on Thu Feb 15, 2018 9:18 am

Oh crud, I typed a really long reply and it seems to have disappeared. I will wait a day ... maybe they (admins) need to approve it since they started the anti-spam policy.
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- 21 (7x3) SolarWorld 300w (6300w)
- 5 SimpliPhi 3.4 kWh LI batteries (335ah)
- 1 Honda 3000 generator + one spare

Re: FM80 goes silent; MX60 still charging

Postby David LeBow on Thu Feb 15, 2018 9:32 am

"There are no posts waiting for approval."

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Re: FM80 goes silent; MX60 still charging

Postby Mike Curran on Thu Feb 15, 2018 11:06 am

gtarolli wrote:Oh crud, I typed a really long reply and it seems to have disappeared. I will wait a day ... maybe they (admins) need to approve it since they started the anti-spam policy.

I HATE when that happens! :sad:
Mike Curran
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Posts: 470
Joined: Sat Aug 28, 2004 6:28 pm
Location: Chagrin Falls, Ohio
My RE system: Outback:
- 8 (2x4) Evergreen 180's into one MX60
- 6 (2×3) ALEO S79-300's into one FM80
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC
- 12 Surrette/Rolls 2V x 1766Ah
- Hub10.3, Mate3, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar:
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied.

Re: FM80 goes silent; MX60 still charging

Postby gtarolli on Thu Feb 15, 2018 4:09 pm

Too many tabs open in Chrome - I must have closed the one I was typing in ...

I'll try to recreate my reply ...

My ignorance of grid-tie mode shows ... One quick question first - what triggers the auto-grid tie mode - is it the FLEXnet DC charge parameters? If so,
how are these set and does this get triggered before/after you are in Absorb or Float modes?

I can think of a few experiments and things to check. I think the issue is either the AC warning resetting the float voltage , or the float voltage being lower than the sell voltage. Or a combo of the two. In either case , if the FM80 controller goes into float mode after the auto-grid tie mode is enabled (which raises the float voltage to the absorb voltage) and float voltage is 26.4 which is lower than the sell voltage of 26.8, then one controller might go Silent and get "stuck" in Float mode.

The manual recommends setting the inverter float,absorb, etc voltages lower than the charge controllers to make it easier to sell. So I would check all those first. And if you never want the inverter to charge your batteries, perhaps disable the inverter's charger?

You can use the Misc. menu on the charge controllers to verify the current Target voltage (page 45 of the FM80 manual) and shed light on the behavior.
The Misc #2 screen shows PCB, Target, BTMP, CFB. The Target voltage is what the controller is shooting for. This will be the voltage for the current mode (Absorb, Float, EQ), with temp. compensation factored in, and I suppose any adjustments for the auto-grid tie mode. I would verify what the target voltage is after you first enter float mode (26.4?), and also after grid-tie mode is enabled (absorb voltage of 29.4) and then again after you get the AC high voltage input warning (it should return to 26.4). Make sure this matches what you would expect the system to be shooting for. This might shed much light on the underlying issue.

One issue might be that many mode changes occur at about the same time, e.g. grid-tie mode is enabled and then Bulk mode switches to not charging and then switches to Float mode, all this occurs within one minute in your log. It could be that the switch to Float mode sets the float voltage 26.4, throwing away the higher (absorb) setting that the auto grid-tie mode institutes. Or if the default reconnection delay of 5 minutes delays the selling of power, the controllers might reach their float voltages and then one goes Silent and gets stuck there. So .... one experiment would be to set the Absorb time (5 mins?) to be about 5 minutes longer than the reconnection delay (e.g. increase it to 10 minutes). This should guarantee you don't enter Float mode until AFTER the inverters start selling. And then if the Target voltage for the charge controllers is the absorb voltage (29.4) and you
are selling, then they should never reach their target voltage, so you might stay in Absorb mode (or Float mode) forever, which is what I think you want (with the inverters selling enough power to keep the voltage at the lower sell voltage so as to not overcharge your batteries).

But...another issue could be that if you get the AC high input warning and you are in float mode then the float voltages are reset to 26.4. Since the current battery voltage is probably the sell voltage which is higher than the float voltage, one CC will probably go silent and could get stuck there
if the other can maintain the float voltage. You can check the target voltages after you get the AC high warning and see if both are 26.4. If so, I could easily believe one is in Float mode and one is Silent. And the one in Float mode won't even be generating max watts I be. So it seems like the float voltage should be higher than the sell voltage, e.g. 27.0 or 27.2, or you can lower the sell voltage to a little below the float voltage (or a combination of adjusting both) depending on what seems to be best. That way when the inverter is selling, the actual voltage should be less than the float voltage and both charge controllers should be in Float mode generating max power since the inverter will sell the excess power to keep the voltage low. Note that the float voltage might have to be .2 or .4 volts higher than the sell voltage to "kick" a controller out of Silent mode into Float mode after the AC warning goes away (which I assume it does).

As a last resort you could adjust the inverter tolerance to eliminate the AC high voltage input warning. This could be dangerous though ...

Sorry for the long rambling reply ... hopefully something I mentioned will work or explains the behavior.
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Re: FM80 goes silent; MX60 still charging

Postby Mike Curran on Sat Feb 17, 2018 4:19 pm

Thanks, and sorry for the delayed response. My septic pump failed (after 35 years in service) and I had other priorities.

I will take a look at your suggestions, I think raising float above sell and increasing my absorb time to 10 minutes both sound promising.

Thanks again. - Mike

Edit 2/20/18: I raised the float setpoint on both charge controllers to 0.2V higher than the sell voltage, increased absorb time to 10 minutes, and finally, I disabled "auto charge termination control" on the Mate3. Apparently one or a combo of these worked because today both chargers stayed in bulk, trying to sell all day long. Hoorah!
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Joined: Sat Aug 28, 2004 6:28 pm
Location: Chagrin Falls, Ohio
My RE system: Outback:
- 8 (2x4) Evergreen 180's into one MX60
- 6 (2×3) ALEO S79-300's into one FM80
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC
- 12 Surrette/Rolls 2V x 1766Ah
- Hub10.3, Mate3, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar:
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied.

Re: FM80 goes silent; MX60 still charging

Postby Mike Curran on Sat Feb 24, 2018 10:26 am

I was watching Outback's webinar on their new Flexmax100 charge controller the other night and saw them touting its separate voltage sensing circuit. Apparently the older charge controllers (like mine) sense battery voltage through the same wires that supply charge current to the battery, and if one CC is supplying a significantly higher current than the other, the voltage drop makes it sense a different battery voltage than the other CC. Combine this effect with one CC's voltage calibration being slightly off compared to the other, and you get the exact problem I observed: one CC will go silent while the other continues to charge.

In the webinar OB acknowledges this as a potential problem when there are multiple charge controllers in a system and introduced this new feature with their FM100's to address it. I'm (a little) surprised no one from OB chimed in to answer my original question, seeing as how they are aware of this problem, but I guess they can't address every post that appears on here. And maybe sometimes the right hand doesn't know what the left is doing... :-k
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Joined: Sat Aug 28, 2004 6:28 pm
Location: Chagrin Falls, Ohio
My RE system: Outback:
- 8 (2x4) Evergreen 180's into one MX60
- 6 (2×3) ALEO S79-300's into one FM80
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC
- 12 Surrette/Rolls 2V x 1766Ah
- Hub10.3, Mate3, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar:
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied.

Re: FM80 goes silent; MX60 still charging

Postby gtarolli on Sat Feb 24, 2018 10:42 am

I am not convinced that is the real problem here. Although I have 2 FX80, one has 12 panels, the other 9. And so the charge current is very different for them. As I said, it is normal for one to go Silent once you are in float mode if the other can supply the loads. However, when you are selling, the inverter that is selling should add a large enough load to keep both CCs running near their max capacity given the sun. Similarly, in my off-grid system, if I turn on the microwave, or the sun is going down, the silent CC wakes up (or it should) and starts helping out.
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- 21 (7x3) SolarWorld 300w (6300w)
- 5 SimpliPhi 3.4 kWh LI batteries (335ah)
- 1 Honda 3000 generator + one spare

Re: FM80 goes silent; MX60 still charging

Postby Mike Curran on Sat Feb 24, 2018 10:54 am

Well, it seems I've corrected the problem by
1) recalibrating the battery voltage on each CC;
2) Disabling charge termination control;
3) raising float voltage setpoint to 0.2V above sell on both CC's;
4) increasing absorb time for charge parameters met/okay to sell from 5 minutes to 10.

Don't know which of these corrected the problem but it's working okay now.

Btw, here's a link to the webinar. The discussion of the FM100's new voltage sensing circuit, and the rationale behind it, starts at 21:10 into the presentation. https://youtu.be/dyQWLNNLHuY
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Posts: 470
Joined: Sat Aug 28, 2004 6:28 pm
Location: Chagrin Falls, Ohio
My RE system: Outback:
- 8 (2x4) Evergreen 180's into one MX60
- 6 (2×3) ALEO S79-300's into one FM80
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC
- 12 Surrette/Rolls 2V x 1766Ah
- Hub10.3, Mate3, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar:
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied.

Re: FM80 goes silent; MX60 still charging

Postby gtarolli on Sat Feb 24, 2018 11:10 am

Thanks for the link and very glad you solved your problem. Calibration is always good. You could undo each of your changes to see what solved the problem. I think a combination of setting the float volts higher than sell and the longer absorb time are the keys. Do you ever exit absorb mode - or does the selling keep the voltage lower than the absorb volts?
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- 1 GS8048A, Mate3, FlexNetDC, Hub10.3
- 2 FLEXmax 80
- 21 (7x3) SolarWorld 300w (6300w)
- 5 SimpliPhi 3.4 kWh LI batteries (335ah)
- 1 Honda 3000 generator + one spare

Re: FM80 goes silent; MX60 still charging

Postby Mike Curran on Sat Feb 24, 2018 11:16 am

gtarolli wrote:Thanks for the link and very glad you solved your problem. Calibration is always good. You could undo each of your changes to see what solved the problem. I think a combination of setting the float volts higher than sell and the longer absorb time are the keys. Do you ever exit absorb mode - or does the selling keep the voltage lower than the absorb volts?

So far both CC's are still in bulk at the end of the day. Haven't had a really sunny day since these changes were made but expect Monday's forecast sunshine will settle this one way or another.

Thanks for your help!!!
Mike Curran
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Posts: 470
Joined: Sat Aug 28, 2004 6:28 pm
Location: Chagrin Falls, Ohio
My RE system: Outback:
- 8 (2x4) Evergreen 180's into one MX60
- 6 (2×3) ALEO S79-300's into one FM80
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC
- 12 Surrette/Rolls 2V x 1766Ah
- Hub10.3, Mate3, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar:
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied.

Re: FM80 goes silent; MX60 still charging

Postby gtarolli on Sat Feb 24, 2018 11:24 am

So you are probably selling a lot more than in the past. Let us know after a sunny day. If you never exit Bulk mode, then you need to figure out if your batteries need an absorb cycle or not. If they do need one , then you should figure out how to trick the system into achieving one, e.g. you could set the sell voltage equal to your batteries absorb volts and then raise the absorb setting a little higher. That should keep the system in absorb mode forever once you get there, which might be too long. Much depends on the conditions required for selling to begin, and I can't remember them ...
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Joined: Thu Dec 21, 2017 11:39 am
Location: Wainiha, Kauai, HI
My RE system: Outback: off-grid
- 1 GS8048A, Mate3, FlexNetDC, Hub10.3
- 2 FLEXmax 80
- 21 (7x3) SolarWorld 300w (6300w)
- 5 SimpliPhi 3.4 kWh LI batteries (335ah)
- 1 Honda 3000 generator + one spare

Re: FM80 goes silent; MX60 still charging

Postby Mike Curran on Sat Feb 24, 2018 2:13 pm

Since I'm grid-tied I'm almost always in float during the daytime (except for a short absorb cycle described below) and I regularly check specific gravity on a pilot cell of my battery. It's always close to being 100% SOC.

Well, they do go into a short absorb cycle each day until charge parameters are met, then sell voltage "kicks in" and battery voltage is pulled down to sell voltage.

Here's a photo from Optics showing the prolonged bulk voltage climb today (quite cloudy) until around 1300, when battery reached 29.5 absorb setpoint for 10 minutes. This occurs every day, my system won't sell until this short cycle is completed.
Screenshot_20180224-160435.jpg
The short rise in voltage at 0500 was due to a refloat cycle fed by grid power. In the lower right corner you can see the max and min voltages for the 1300 hour. I cut off the solar data on the left, fyi it was 1.3kwh at this snapshot point (around 1600).
Mike Curran
Forum Guru
 
Posts: 470
Joined: Sat Aug 28, 2004 6:28 pm
Location: Chagrin Falls, Ohio
My RE system: Outback:
- 8 (2x4) Evergreen 180's into one MX60
- 6 (2×3) ALEO S79-300's into one FM80
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC
- 12 Surrette/Rolls 2V x 1766Ah
- Hub10.3, Mate3, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar:
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied.

Re: FM80 goes silent; MX60 still charging

Postby gtarolli on Sat Feb 24, 2018 2:55 pm

Looks like things are working as you would expect.

I am curious about the spikes in "to load", where do those kWh come from as things seem to don't add up for that hour. For the day, you have 1.3kwh from solar, 6.1 from grid, that adds up to 7.4 but you sent 9.9 to loads and a net of .7 to the batteries for a total 10.6. Strange that the difference is around 3 kWh? Have you invented a free energy machine ? :-)
gtarolli
Forum Whiz
 
Posts: 48
Joined: Thu Dec 21, 2017 11:39 am
Location: Wainiha, Kauai, HI
My RE system: Outback: off-grid
- 1 GS8048A, Mate3, FlexNetDC, Hub10.3
- 2 FLEXmax 80
- 21 (7x3) SolarWorld 300w (6300w)
- 5 SimpliPhi 3.4 kWh LI batteries (335ah)
- 1 Honda 3000 generator + one spare

Re: FM80 goes silent; MX60 still charging

Postby Mike Curran on Sat Feb 24, 2018 8:30 pm

gtarolli wrote:Looks like things are working as you would expect.

I am curious about the spikes in "to load", where do those kWh come from as things seem to don't add up for that hour. For the day, you have 1.3kwh from solar, 6.1 from grid, that adds up to 7.4 but you sent 9.9 to loads and a net of .7 to the batteries for a total 10.6. Strange that the difference is around 3 kWh? Have you invented a free energy machine ? :-)

I can only guess but I'd say the spikes are either my septic/sump pump and/or my well pump, plus the fridge. There's also a thermostat-controlled hydronic circ pump that cycles on and off. The 0500 spike was a refloat cycle.

Can't explain why those energy numbers don't balance out, some days they make sense, others not so much.
Mike Curran
Forum Guru
 
Posts: 470
Joined: Sat Aug 28, 2004 6:28 pm
Location: Chagrin Falls, Ohio
My RE system: Outback:
- 8 (2x4) Evergreen 180's into one MX60
- 6 (2×3) ALEO S79-300's into one FM80
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC
- 12 Surrette/Rolls 2V x 1766Ah
- Hub10.3, Mate3, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar:
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied.


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