HELP PLEASE!!!

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madsam58
Forum Junior Member
Posts: 2
Joined: Sat Nov 10, 2018 1:53 am
My RE system: flexmax 80, mate3, typically all outback equipment

HELP PLEASE!!!

Post by madsam58 » Sat Nov 10, 2018 2:12 am

my current setup is
32 x 12v170fs batterys ( 8 banks of 4s) to give me 48v
mate3
3 x flexmax 80
3 x invertors vfxr3048e single phase

I am trying to find the correct setup for the flexmax80 I just cant seem to get it right. my current settings are
current limit: 80.0A
absorbing: 54.5v
Float: 52.5v
any suggestions on how to set this up for maximum KwH with this many batterys I should have enough power sto last some time?

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: HELP PLEASE!!!

Post by petertearai » Sat Nov 10, 2018 7:34 pm

Hi . In what way do you think your system is not performing ?
Voltages for batterys , your battery manufacturer should have the recommended settings .
One thing though ,,,,,, with that many parallel strings it is often difficult to keep them evenly charged
2220 pv. fm80. 12 times 2 volt exc shoto lead carbon 450 AH 24 volts. victron battery monitor. outback fxr 2000 watt inverter

Mike Curran
Forum Emperor
Posts: 1788
Joined: Sat Aug 28, 2004 6:28 pm
My RE system: Outback - Garage roof:
- 8 (2x4) Evergreen 180's into one FM80 (2007/2020 - replaced 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

Outback Skybox - Barn roof: (2019)
- 14 Talesun 275W in series (DC array input to SB charger)
- 3 SimpliPhi 3.8 batteries, 48V, 225Ah total
- AC coupled input (manual switch during grid outage only) from 14 Talesun 275W,
Enphase M215 microinverters, normally direct grid tied

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

Re: HELP PLEASE!!!

Post by Mike Curran » Sun Nov 11, 2018 10:12 am

A quick google search gives this for battery type:
US-VFT-PS-AC 0817_WEB.PDF
(352.34 KiB) Downloaded 220 times
Sealed lead acid, thin plate, no 20 hour rate specified.
Unfortunately I don't think these are meant to be cycled in a renewable energy application. They are for telecommunications/backup use. The specs only give recommended float voltage settings, no absorb setting is specified.
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

madsam58
Forum Junior Member
Posts: 2
Joined: Sat Nov 10, 2018 1:53 am
My RE system: flexmax 80, mate3, typically all outback equipment

Re: HELP PLEASE!!!

Post by madsam58 » Sun Nov 11, 2018 1:45 pm

Thank you for your replies, does this mean these are the wrong type of batteries for what I'm trying to achieve or will they be ok!

Nominal Capacity
12v 170AH 1.80Vpc

Float Voltage
2.280Vpc

This is more or less the only detail I have on these

Mike Curran
Forum Emperor
Posts: 1788
Joined: Sat Aug 28, 2004 6:28 pm
My RE system: Outback - Garage roof:
- 8 (2x4) Evergreen 180's into one FM80 (2007/2020 - replaced 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

Outback Skybox - Barn roof: (2019)
- 14 Talesun 275W in series (DC array input to SB charger)
- 3 SimpliPhi 3.8 batteries, 48V, 225Ah total
- AC coupled input (manual switch during grid outage only) from 14 Talesun 275W,
Enphase M215 microinverters, normally direct grid tied

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

Re: HELP PLEASE!!!

Post by Mike Curran » Sun Nov 11, 2018 3:38 pm

madsam58 wrote:Thank you for your replies, does this mean these are the wrong type of batteries for what I'm trying to achieve or will they be ok!
Maybe.. depends on what you're trying to achieve. If you're grid-tied and just want them for battery backup, that's probably a good application for them, since that's what they're designed to do. But if you're off-grid and want these to support your loads at night, they might work if your loads are minimal and you don't discharge them too deeply.

On the other hand, it looks like you've got quite a bit of capacity so these might work even for higher loads. Full disclosure: I'm no expert on telecom batteries but when I looked yours up and their construction was described as "thin plate" I immediately assumed they're not good for renewable applications. Further research shows the Victron telecom battery, for example, is good for 750 cycles at 50% discharge, which doesn't seem like a lot of cycles - about 2 years' worth if cycled to 50% daily. So let me repeat Peter's question: In what way do you think your system is not performing? 
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

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