Over efficient panels?

Discussion about the FM100, FM80, and FM60 Charge Controllers

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Chris19
Forum Member
Posts: 7
Joined: Tue Aug 01, 2017 9:52 am
My RE system: 2x2 245w Panasonic panels (VBHN245S), 1000Ah battery (12v), FM80, GFX1312E, Mate3, Atkinson GSCM, (FNDC disabled) - off grid.
Location: North Yorkshire, UK.

Over efficient panels?

Post by Chris19 » Tue Aug 01, 2017 12:42 pm

Hello

I have just finished a self-build with a two by two array of 245w panels feeding a FM80 at 12v but promptly turned off the array when the mate read 2093w. Not only is this over spec for the panels, but the sun was at least 30 degrees beyond them.

Is this likely to be a panel problem or a setup/configuration issue?

Thanks

Mike Curran
Forum Emperor
Posts: 1522
Joined: Sat Aug 28, 2004 6:28 pm
My RE system: Outback - Garage roof:
- 8 (2x4) Evergreen 180's into one FM80 (2007/2020 repl'd MX60)
- 6 (2×3) ALEO S79-300's into one FM80 (2017)
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC (2007)
- 12 Surrette/Rolls 2V x 1766Ah (2007)
- Hub10.3, Mate3s, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar - Barn roof: (2012)
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied, no longer AC- coupled

Outback Skybox - Barn roof: (2019)
- 14 (2x7) Talesun 275W (DC array input to SB charger)
- 3 SimpliPhi 3.8 batteries, 48V, 225Ah total
- AC coupled input from 14 Talesun 275W, Enphase M215 modules

All self-designed and self-installed
Location: Chagrin Falls, Ohio

Re: Over efficient panels?

Post by Mike Curran » Tue Aug 01, 2017 5:24 pm

There's no way you could miswire these 4×245W panels to get 2093 watts. If you've configured your FM80 for something other than 12 volts, not sure what effect that would have, but seems doubtful that could cause this. If everything's wired right I'd suspect the FM80. More details on your overall system might help forum readers diagnose the problem.
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

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: Over efficient panels?

Post by petertearai » Tue Aug 01, 2017 9:07 pm

4 panels in series could have gone over 150 volts?
2220 pv. fm80. 12 times 2 volt exc shoto lead carbon 450 AH 24 volts. victron battery monitor. outback fxr 2000 watt inverter

Chris19
Forum Member
Posts: 7
Joined: Tue Aug 01, 2017 9:52 am
My RE system: 2x2 245w Panasonic panels (VBHN245S), 1000Ah battery (12v), FM80, GFX1312E, Mate3, Atkinson GSCM, (FNDC disabled) - off grid.
Location: North Yorkshire, UK.

Re: Over efficient panels?

Post by Chris19 » Tue Aug 01, 2017 10:02 pm

Thanks for the replies, but in reading them I see I have made a significant typo - should read 1093w - 12% over spec, sorry :oops:

The panels are in two pairs, so open voltage about 102, battery temp was 19C.

Chris

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: Over efficient panels?

Post by petertearai » Tue Aug 01, 2017 10:09 pm

brand new panels . cold . I would think not out of the question . was this sustained or over a short period ?. cloud edge effect .my system shows a maximum watts in excess if rated panels .. but don't know when or for how long .
2220 pv. fm80. 12 times 2 volt exc shoto lead carbon 450 AH 24 volts. victron battery monitor. outback fxr 2000 watt inverter

blackswan555
Forum Emperor
Posts: 2637
Joined: Sat Aug 30, 2008 5:50 am
My RE system: Other peoples, VFX "E" versions, FLA`s, Generators.
Location: Ibiza Spain,

Re: Over efficient panels?

Post by blackswan555 » Tue Aug 01, 2017 10:20 pm

Sub 25c panels and possibly "edge of cloud effect" But in North Yorkshire !!!!!! Wow :grin:

Tim

https://solarhomenews.wordpress.com/200 ... ink-it-is/
My comments are based on my experience and research, They are not endorsed or checked by Outback.I am an independent British electrician living in Spain, So please take this into account when reading /acting on my post`s.

Chris19
Forum Member
Posts: 7
Joined: Tue Aug 01, 2017 9:52 am
My RE system: 2x2 245w Panasonic panels (VBHN245S), 1000Ah battery (12v), FM80, GFX1312E, Mate3, Atkinson GSCM, (FNDC disabled) - off grid.
Location: North Yorkshire, UK.

Re: Over efficient panels?

Post by Chris19 » Tue Aug 01, 2017 10:28 pm

It was a break in the cloud and I disconnected the panels very quickly but the system has yet to be subjected to the full path of the sun and a clear sky. Thanks.

Mike Curran
Forum Emperor
Posts: 1522
Joined: Sat Aug 28, 2004 6:28 pm
My RE system: Outback - Garage roof:
- 8 (2x4) Evergreen 180's into one FM80 (2007/2020 repl'd MX60)
- 6 (2×3) ALEO S79-300's into one FM80 (2017)
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC (2007)
- 12 Surrette/Rolls 2V x 1766Ah (2007)
- Hub10.3, Mate3s, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar - Barn roof: (2012)
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied, no longer AC- coupled

Outback Skybox - Barn roof: (2019)
- 14 (2x7) Talesun 275W (DC array input to SB charger)
- 3 SimpliPhi 3.8 batteries, 48V, 225Ah total
- AC coupled input from 14 Talesun 275W, Enphase M215 modules

All self-designed and self-installed
Location: Chagrin Falls, Ohio

Re: Over efficient panels?

Post by Mike Curran » Wed Aug 02, 2017 8:19 am

Relax, you're fine, I've seen my first 1,440 watt (rated) array produce over 1,800 watts! Loved seeing it, too.
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

larrywa
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Posts: 354
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My RE system: FlexPower Two
2 x GVFX3648s,
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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
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Re: Over efficient panels?

Post by larrywa » Wed Aug 02, 2017 7:43 pm

Chris19 wrote:It was a break in the cloud and I disconnected the panels very quickly but the system has yet to be subjected to the full path of the sun and a clear sky. Thanks.
Just wait until you get one of those cold crisp fall or spring mornings. The colder the better.
When we get those -25C winter days in Canada my panels put out 140% when they aren't covered in snow you guys send over here! :grin:

blackswan555
Forum Emperor
Posts: 2637
Joined: Sat Aug 30, 2008 5:50 am
My RE system: Other peoples, VFX "E" versions, FLA`s, Generators.
Location: Ibiza Spain,

Re: Over efficient panels?

Post by blackswan555 » Wed Aug 02, 2017 9:15 pm

It was a break in the cloud and I disconnected the panels very quickly but the system has yet to be subjected to the full path of the sun and a clear sky
No need to disconnect panels (& possibly a bad idea under load) The FM will limit itself to 80A anyway, Theoretically you could put any wattage of panels on it and still only get 80A "out the other side"

Tim
My comments are based on my experience and research, They are not endorsed or checked by Outback.I am an independent British electrician living in Spain, So please take this into account when reading /acting on my post`s.

Chris19
Forum Member
Posts: 7
Joined: Tue Aug 01, 2017 9:52 am
My RE system: 2x2 245w Panasonic panels (VBHN245S), 1000Ah battery (12v), FM80, GFX1312E, Mate3, Atkinson GSCM, (FNDC disabled) - off grid.
Location: North Yorkshire, UK.

Re: Over efficient panels?

Post by Chris19 » Wed Aug 02, 2017 10:03 pm

Thank you everyone for your comments on this thread and others I have found/read since, very helpful and reassuring. Winter will be interesting as the house is an old railway cottage in the bottom of a valley and will be in shadow for over a month, but then we are not there all the time. :grin:

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