Newbie help

Discussion about the FM100, FM80, and FM60 Charge Controllers

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1madtrapper
Forum Member
Posts: 8
Joined: Tue Apr 12, 2016 8:23 pm
My RE system: two outback flexmax 80 connext 4048. hub, 28, 225watt PV panels.

Newbie help

Post by 1madtrapper » Sun Jun 05, 2016 5:56 am

I tried the string sizing tool but it don't work for me.
I have 28- 225watt panels hooked up 4 panels per string in series- parallel the panels are 36volt 7.56 amp each. I have two flexmax 80's a mate and hub to join them running 24 telcom TEL 12-105F 100AH batts 8hr @1.75vpc at 77 , my questions are Would it be better to run the panels 3 to a string rather then 4?
Should both controllers cycle the same- sometimes the one controller on a sunny day when the other is in float goes to snoozing until I crank on a few things then it will start, is this normal? They never have the same absorb time, I am running between 1100-1400 watts pretty steady though the day and around 400-600w after sundown till morning. Do you think this system will run my entire house? thanks for any advice ,I am tryin to learn.Cheers

larrywa
Forum Guru
Posts: 354
Joined: Thu Jun 25, 2015 11:25 am
My RE system: FlexPower Two
2 x GVFX3648s,
2 x FM80s,
FNDC w/3 shunts,
Mate3 v3.015.005 (works excellent!)
Hub 10.3,
PV:1000W east@45, 600W west@45, 2400W south@19 deg.
Battery:48v @ 130Ahr Crown batteries, deep cycle <$380 for 6.25kWh

ISY994i HA, Insteon, X10, Philips Hue, MiLight bulbs & RGBW strips
WebControl 8 as weather station stuffing
ISY994 variables via REST interface

Raspberry Pi3 x 2, Pi1 B+

Re: Newbie help

Post by larrywa » Sun Jun 05, 2016 6:15 am

First off the FleMax80 has a maximum input voltage of 150 vdc.

Your voltages are not clear and 225 Watt panels are usually 60 cells, making them 30 volts. Perhaps that is the Voc voltage per panel.

Either way 36 volts x 4 panels = 144 volts. If your panels are capable of any more voltage when open circuited in the winter months you better switch to only three panels in a series string so you don't burn out your FlexMax80 inputs.

Your CC units need to be calibrated exactly the same and should be set the same to get the same mode switching. Also, if you have a Mate3 it can co-ordinate CC units. There are a few algorithms inside the Mate3 to terminate the CCs simultaneously, based on the first one to complete Absorb timing, or by FNDC algorithm measurements, if you have one of those.

After matching the calibration of CCs run through the settings for refloat and rebulk triggering to ensure they are set the same.

You can list your equipment in more detail on the right so you don't have to explain it every post in future.

Welcome to the forum!

1madtrapper
Forum Member
Posts: 8
Joined: Tue Apr 12, 2016 8:23 pm
My RE system: two outback flexmax 80 connext 4048. hub, 28, 225watt PV panels.

Re: Newbie help

Post by 1madtrapper » Sun Jun 05, 2016 6:44 am

Yes my panels are 60 cells and yes the voc is 36volts , they are hooked in series and parallel so I am not running 144volts to the CC . I don't have the mate3 I just have the mate in the settings I have clicked yes on the coordination control. The CC's are set to the same bulk voltage aswell as absorb and float, the absorb time on both CC's are both set the same aswell. I know the max input voltage is 150 the max pv input wattage is 4000w as I am running a 48volt set up.

is it normal for on cc to be on float and the other to be on absorb or should they do this at the same time?

larrywa
Forum Guru
Posts: 354
Joined: Thu Jun 25, 2015 11:25 am
My RE system: FlexPower Two
2 x GVFX3648s,
2 x FM80s,
FNDC w/3 shunts,
Mate3 v3.015.005 (works excellent!)
Hub 10.3,
PV:1000W east@45, 600W west@45, 2400W south@19 deg.
Battery:48v @ 130Ahr Crown batteries, deep cycle <$380 for 6.25kWh

ISY994i HA, Insteon, X10, Philips Hue, MiLight bulbs & RGBW strips
WebControl 8 as weather station stuffing
ISY994 variables via REST interface

Raspberry Pi3 x 2, Pi1 B+

Re: Newbie help

Post by larrywa » Sun Jun 05, 2016 6:52 am

1madtrapper wrote:Yes my panels are 60 cells and yes the voc is 36volts , they are hooked in series and parallel so I am not running 144volts to the CC . I don't have the mate3 I just have the mate in the settings I have clicked yes on the coordination control. The CC's are set to the same bulk voltage aswell as absorb and float, the absorb time on both CC's are both set the same aswell. I know the max input voltage is 150 the max pv input wattage is 4000w as I am running a 48volt set up.

is it normal for on cc to be on float and the other to be on absorb or should they do this at the same time?
Mine do the same thing but within a few minutes they both switch to float. They do have independent decision making so it's possible but within 10-15 minutes I would expect to see the same mode on both.

I am not sure what the Mate offers for co-ordination. The Mate3 offer about 4-5 different co-ordination settings and their wording is not usually clear what the function of each is for.

Again, calibration may need to be tweaked so they match more closely and without proper co-ordination from the Mate this may sometimes just miss. Actually the independent timers should kill the absorb cycle regardless but times to start may vary due to previous mentions.

1madtrapper
Forum Member
Posts: 8
Joined: Tue Apr 12, 2016 8:23 pm
My RE system: two outback flexmax 80 connext 4048. hub, 28, 225watt PV panels.

Re: Newbie help

Post by 1madtrapper » Sun Jun 05, 2016 7:07 am

My absorb/float time is uaually pretty close within 20 mins of each other. When one CC is snoozing I assume its cause I don't need the extra power and the batts are full, I can be using 1400watts and one CC is making 1700 if I put a hot plate on and crank it to high within a few seconds the other CC wakes up.

larrywa
Forum Guru
Posts: 354
Joined: Thu Jun 25, 2015 11:25 am
My RE system: FlexPower Two
2 x GVFX3648s,
2 x FM80s,
FNDC w/3 shunts,
Mate3 v3.015.005 (works excellent!)
Hub 10.3,
PV:1000W east@45, 600W west@45, 2400W south@19 deg.
Battery:48v @ 130Ahr Crown batteries, deep cycle <$380 for 6.25kWh

ISY994i HA, Insteon, X10, Philips Hue, MiLight bulbs & RGBW strips
WebControl 8 as weather station stuffing
ISY994 variables via REST interface

Raspberry Pi3 x 2, Pi1 B+

Re: Newbie help

Post by larrywa » Sun Jun 05, 2016 7:20 am

1madtrapper wrote:My absorb/float time is uaually pretty close within 20 mins of each other. When one CC is snoozing I assume its cause I don't need the extra power and the batts are full, I can be using 1400watts and one CC is making 1700 if I put a hot plate on and crank it to high within a few seconds the other CC wakes up.
I don't know if you are grid-tied, or what your configuration is but I have mine set so that each night the re-bulk trigger setting kicks in and every morning with the sunrise they both jump into Bulk. Then they are forced to go through the Bulk | Absorb | Time delay | Float cycles and they both always do it. This takes matching calibration of the sensing.

I have the timers set for 2 hours of bulk but the Mate3 overrides that and shortcuts the time so that I can sell energy quickly.
CC settings.jpg
My CC settings from the local javascript webpage

1madtrapper
Forum Member
Posts: 8
Joined: Tue Apr 12, 2016 8:23 pm
My RE system: two outback flexmax 80 connext 4048. hub, 28, 225watt PV panels.

Re: Newbie help

Post by 1madtrapper » Sun Jun 05, 2016 7:06 pm

This is a non GT system trying to get off the grid altogether , mine is set pretty much as default except I entered the voltage for the GM battery's for float and absorb. Changed the mate to coordinate CC to yes. So it bulks when the sun is up and then cycles much the same.

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