Flexmax 80

Discussion about the FM100, FM80, and FM60 Charge Controllers

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Flexmax 80

Postby gpearce52 on Fri Jan 11, 2019 9:14 am

I have 4 strings connected to a MNPV6 combiner box. Each string's IN V/A on the FM80 reads 107V / 3.5A when connected individually.
When all 4 strings connected the FM80 IN still reads 107V / 3.5A.
Shouldn't 107V / 14A be the expected FM80 reading when all 4 strings are combined?

Thanks
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Re: Flexmax 80

Postby Kurt Lundquist on Fri Jan 11, 2019 2:58 pm

If the controller was in Float or Absorb the 3.5A output was all the batteries/load needed at the time. Bulk and GT Mode are the only charge stages where the controller tries to harvest the max from the array.

-Kurt
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Re: Flexmax 80

Postby gpearce52 on Sat Jan 12, 2019 4:18 pm

Is this normal production? Was not even able to maintain float.
Production today, clear skies
12 panels in 4 strings
Pmpp = 3.20
Isc = 9.94
Voc = 40.56
Imp = 9.47
Vmpp = 33.80
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20190112.png
Last edited by gpearce52 on Mon Jan 14, 2019 7:28 am, edited 1 time in total.
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Re: Flexmax 80

Postby Mike Curran on Sat Jan 12, 2019 5:43 pm

gpearce52 wrote:Is this normal production? Was not even able to maintain float.
I'd say no, not normal. What are your panels' rated power? From your Imp and Vmp they must be around 300W apiece, with 24 of them that's 7.2kw. Your hourly solar output hardly exceeds 0.5kwh, that's not right.

What was happening prior to 7:00a.m., and what happened at the 7 o'clock hour? Looks like midnight to 6 got summarized there...Assuming you're off grid you should be showing some black bars ("to load") during the night.

Be nice to see the voltage graph instead of SOC. Also would be helpful if you would fill in your system profile.
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
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Re: Flexmax 80

Postby gpearce52 on Mon Jan 14, 2019 7:31 am

My mistake, it's actually 12 panels, 320 watts, in 4 strings. System is off at night because batteries cannot get to float and having a problem connecting to the grid.

Each sting average 107V/3.5A, and the same when all four strings combined.

10am EST, no clouds, no shading.
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Re: Flexmax 80

Postby Kurt Lundquist on Mon Jan 14, 2019 8:38 am

The picture shows FM80 is Absorbing at 56V. Remember Absorb is a current limited charge stage where the controller only harvests enough power to maintain battery voltage.

What are your charge settings?

How hot is the battery bank?

What is the amp hour capacity of your battery bank?

What type of batteries are you using?

How old are they?

When did you last check all the battery connections to make sure they are tight and not corroded?

What happens when you turn on more load during a sunny day?

Repost the OpticsRE picture but instead of SOC change the right side to battery voltage. My guess is the controller is regulating the charge because of your charge settings.

Please fill out your forum profile when you have a chance.

Thanks,

-Kurt
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