Both FM 100 Stopped Production

Discussion about the FM100, FM80, and FM60 Charge Controllers

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TerraAlta2020
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Posts: 9
Joined: Sun Jan 19, 2020 7:15 am
My RE system: 10.8 Kw Solar Panels , 8kW Radian Inverter (8048a) , two FM 100 with 6 Simpliphi 3.8kw Batteries

Both FM 100 Stopped Production

Post by TerraAlta2020 » Sat Mar 28, 2020 11:30 am

Today my PV system was working properly when it suddenly stopped producing after the generator weekly exercise process this afternoon. (Probably is a coincidence but was detected after this exercise).

Followed the troubleshooting guide but did not find anything that could guide me to a potential cause for my system.

My system key components are as follows:

1) 32 PV 340 Cells with TIGO RSD and Optimizers
2) Two FM 100
3) One 8048 grid tie inverter
4) 6 Simpliphi Batteries (3.8 kwh each)

Please advise as system is down.
Thanks!!
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Optics RE 03282020.JPG

raysun
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My RE system: Flexpower One: FX3048T, (2) FM80, MATE3s, FlexNetDC
Outback 200NC batteries (8 @ 48v)
Outback IBR3 battery enclosure
Suniva 330 watt panels (12 - 6 strings of 2 in series)
Hyundai 355 watt panels (6 - 3 strings of 2 in series)
Honda EU7000is gas fuel generator

Re: Both FM 100 Stopped Production

Post by raysun » Sat Mar 28, 2020 11:40 am

Not sure if its a contributing factor, but the PV arrays certainly bump up against the maximum amperage limits of the FM100.

By my grade school math: 16 x 340W / 50V = 108A at STC. If there is overproduction, there's additional stress.

The Tigo optimizers may add another twist to the tale.

Any events in the logs?

fcwlp
Forum Guru
Posts: 295
Joined: Wed Jan 22, 2020 9:40 am
My RE system: GS8048A, FM80 w/3,600 W PV Fixed, FM80 w/2,700W on Zomeworks tracker, Mate3, 24 Trojan 2V L16 1100AH @ C20, Grid-Tied with Kohler 14RESA LPG Generator and MEP-803 Diesel if needed
I also install and maintain grid-tied and off-grid systems, details will be given for these system if required
Location: 80 miles NE of Phoenix at 5500'

Re: Both FM 100 Stopped Production

Post by fcwlp » Sat Mar 28, 2020 7:37 pm

raysun wrote:
Sat Mar 28, 2020 11:40 am
By my grade school math: 16 x 340W / 50V = 108A at STC. If there is overproduction, there's additional stress.
Raysun the FM100 can handle more PV input, with string design tool caution is indicated starting at 6,000W, with a hard limit of not to exceed 7,000W. The datasheet sets an upper limit of 6,000W.
TerraAlta2020 wrote:
Sat Mar 28, 2020 11:30 am
Today my PV system was working properly when it suddenly stopped producing after the generator weekly exercise process this afternoon. (Probably is a coincidence but was detected after this exercise).
If I recall correctly, I had a similar behavior several years ago on my system. Check to see if the inverter is on. In OpticsRE, click on the gear symbol at the top right of the screen (next to system name) and verify if inverter is on or off. For some reason it was not automatically kicking back on my system.

I switched my generator (Kohler 14RESA) to do its own exercise cycle, which has three benefits. It is an exercise cycle that Kohler recommends, the generator tracks the exercise and does not tell you it is due, and I no longer had the issue you experienced. I probably should have done more debugging but it was not a priority.

TerraAlta2020
Forum Member
Posts: 9
Joined: Sun Jan 19, 2020 7:15 am
My RE system: 10.8 Kw Solar Panels , 8kW Radian Inverter (8048a) , two FM 100 with 6 Simpliphi 3.8kw Batteries

Re: Both FM 100 Stopped Production

Post by TerraAlta2020 » Tue Mar 31, 2020 1:59 pm

Good aftrenoon:

It is not the case as this is a 4x4 array per Flexmax therefore a max Isc of 9.59 amps x 4 = 38.36 amps.

The next day the system started procucing but somewhat limited (One Flexmax) . Actually I called Outback tech support and their argument was that my inverter was running high in temperature.
I did not agree as the room temperature for the system is ~ 85F (29.4C) . That will account only for ~400 W derating and not the amount we are experiencing (basically one of the Flexmax not producing)
We also turned off the one producing and the second one kicked in but not both at the same time therefore dwindling the production or power injected to the Energy Company. (this is grid tied system)
(In terms of inverter max derating....and By my grade school math 80 VA/degrees C X 5 degrees C= 400 VA)

Let me know if you have further ideas.
Optics RE name - Eduardo Delgado
Thanks in advance

raysun
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Posts: 2109
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower One: FX3048T, (2) FM80, MATE3s, FlexNetDC
Outback 200NC batteries (8 @ 48v)
Outback IBR3 battery enclosure
Suniva 330 watt panels (12 - 6 strings of 2 in series)
Hyundai 355 watt panels (6 - 3 strings of 2 in series)
Honda EU7000is gas fuel generator

Re: Both FM 100 Stopped Production

Post by raysun » Tue Mar 31, 2020 2:18 pm

Your profile is missing some equipment. I assume there's is a Mate3s, yes?

Is Global Charge Control enabled? What is max. amperage?

The maximum charge current for 3 simpliphi blocks is a nit over 100A

Array current is mentioned but not array voltage. The charge controllers will convert high voltage, low current input to low voltage, high current output.

TerraAlta2020
Forum Member
Posts: 9
Joined: Sun Jan 19, 2020 7:15 am
My RE system: 10.8 Kw Solar Panels , 8kW Radian Inverter (8048a) , two FM 100 with 6 Simpliphi 3.8kw Batteries

Re: Both FM 100 Stopped Production

Post by TerraAlta2020 » Tue Mar 31, 2020 2:48 pm

Good afternoon:
Yes, it does have a Mate 3S
The Global Charge Control is Disabled and max battery charge set was for 80 Amps as per Simplphi guidelines
The Voc for the array is ~188.28 Volts

Thanks in advance,
ED
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Screen Shot 2020-03-31 at 5.44.05 PM.png
Screen Shot for Mate 3S parameters

raysun
Forum Emperor
Posts: 2109
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower One: FX3048T, (2) FM80, MATE3s, FlexNetDC
Outback 200NC batteries (8 @ 48v)
Outback IBR3 battery enclosure
Suniva 330 watt panels (12 - 6 strings of 2 in series)
Hyundai 355 watt panels (6 - 3 strings of 2 in series)
Honda EU7000is gas fuel generator

Re: Both FM 100 Stopped Production

Post by raysun » Tue Mar 31, 2020 4:08 pm

TerraAlta2020 wrote:
Tue Mar 31, 2020 2:48 pm
Good afternoon:
Yes, it does have a Mate 3S
The Global Charge Control is Disabled and max battery charge set was for 80 Amps as per Simplphi guidelines
The Voc for the array is ~188.28 Volts

Thanks in advance,
ED
IIRC, the Maximum Battery Charge (amps) setting is only active when Global Charger Control is enabled (and off-grid system set to Grid Tie).

Might want to check that the charging current is being limited as expected. The other charge limit settings are in the charge controllers themselves, I believe.

Also the 80A charging spec is confusing. The SimpliPhi 3.8 is rated at 37.5A per block. 6 would be 37.5 x 6 = 225A. Why would the recommendation be 80A?

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