First try system

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slittle@ebparks.org
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My RE system: 12 Kyocera 235 watt modules
Flexmax 80
GVFX3524
16 Sunextender 212 Ah AGM batteries

First try system

Post by slittle@ebparks.org » Thu Oct 20, 2011 1:58 pm

Heres a couple of my first off grid system near Livermore, CA.
DSCN1684.jpg
DSCN1685.jpg
DSCN1657.jpg

petertearai
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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
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Re: First try system

Post by petertearai » Thu Oct 20, 2011 4:36 pm

Very neat looking system!!!
2220 pv. fm80. 12 times 2 volt exc shoto lead carbon 450 AH 24 volts. victron battery monitor. outback fxr 2000 watt inverter

Serge Dufresne
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Re: First try system

Post by Serge Dufresne » Fri Oct 21, 2011 4:54 am

This is the cleaniest installation I've ever seen.

I try to figure out, how you've connect the battery bank.

Note: I'm not an expert, I just want to learn. This is an unused way to connect the batteries for me, and I want to improve myself.

Thanks for sharing.

Vic
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Re: First try system

Post by Vic » Fri Oct 21, 2011 9:13 am

Hi slittle,

WOW, This IS a very clean install!

Is this an EBRPD system, or is is it a private system. The hills kinna look like it is around the Altamont Pass.

I, too, wondered about the wiring details of the batteries. Some more battery info and wiring would help me/us understand.

This is the cleanest installation I've seen as well.

Thanks, Vic
4/20/08: 18 Shell SQ 175-106 Vmpp, Stacked 5548 SW+, 1350 AH Surrette 4KS25's, MX-60, Kubota SQ-3250 25 KVA Polyphase Diesel genset. Thanks OutBack for this Forum + the great Support and Service.

slittle@ebparks.org
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Posts: 4
Joined: Thu Oct 20, 2011 8:07 am
My RE system: 12 Kyocera 235 watt modules
Flexmax 80
GVFX3524
16 Sunextender 212 Ah AGM batteries

Re: First try system

Post by slittle@ebparks.org » Fri Oct 21, 2011 4:22 pm

Thanks for the nice comments. Ive been and electrician my whole career, but no solar except really small installations. So conduit etc I can handle!

The batteries are wired 2 in series, top to bottom shelf, then the 8 in parallel for 24 volts, 1696 Ah.

It is a park security residence off Vasco Road. Heres the irony: Gargantuan new siemens wind farm, none for us!
DSCN1760.jpg

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Kurt Lundquist
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Re: First try system

Post by Kurt Lundquist » Fri Oct 21, 2011 4:48 pm

Nice looking system!

What sort of series parallel configuration did you use for your solar panels? On a 24Vdc system the FM80 is only rated to handle up to 2.5 KW max. The NEC recommends 2KW max. You have over 2.8KW hooked to that charge controller. I would be really worried about cold conditions or edge of cloud effect situations. If the budget allows I highly suggest getting another charge controller and splitting the array into two. This will let each device operate more efficiently, provide for redundancy, and help ensure that you do not experience premature equipment failure. Remember you warranty is voided if high voltage causes the magic smoke to escape.

-Kurt
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http://alphaenergy.us/

Kent Osterberg
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Re: First try system

Post by Kent Osterberg » Fri Oct 21, 2011 10:17 pm

Nice looking installation. I too have a question about the battery wiring. Where does the negative wire going to to inverters land? On the left side of the batteries or the right side? Can't tell in the photo, but if on the left side, the current on the right side of the bank will be much less than on the left.

slittle@ebparks.org
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My RE system: 12 Kyocera 235 watt modules
Flexmax 80
GVFX3524
16 Sunextender 212 Ah AGM batteries

Re: First try system

Post by slittle@ebparks.org » Mon Oct 24, 2011 9:13 am

The modules are wired 3 in series, 4 in parallel, so the calcs I used are this:
36.9 Voc * 3 = 110.7 Voc * 1.17 (690.7) = 129.5 Voc

8.55 Isc * 4 = 34.2 Isc * 1.56 (690.8(A)(1) and (B)(1) = 53.4 Isc

Which fit into the spec for the FM80 not to exceed 150 VDC and 64 amps.

Are these bad calcs? I understand what you are saying about reduncency etc, and its been a long time since I heard the "magic smoke", I got a chuckle out of that one. Im pretty much tapped on spending money on this system, but certainly will consider what you have to offer on my next one.

And the negative battery cable is going to the right side of the bank, opposite end of from the pos.

Serge Dufresne
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Re: First try system

Post by Serge Dufresne » Mon Oct 24, 2011 9:43 am

You have 12 Pv Modules of 235 watts each.

12 X 235 = 2820 watts total @ STC. The maximum solar array STC nameplate for the Flexmax 80 is 2500 watts STC.
http://www.outbackpower.com/products/ch ... s/flexmax/

And if we take 2820watts/24 volts we get 117.5 amps STC. We are exceeding the maximum output current.

Here's an example, how to calculate the Voc with the temperature coefficient.
Serge Dufresne wrote:
1- Collect the temperature coefficient of VOC for the PV module.
2-Collect the record cold temperature for your location in degrees Celsius.
3-Calculate how many degrees Celsius less than STC the site will be on that record cold day.
4-Multiply the temperature coefficient for the module by the number of degrees calculated in step 3.
5-Add the number of volts calculated in step 4 to the VOC for he module at STC.

For the maths, the only incertitude I have is your record cold temperature. So lets assume it's -10┬░C

1- -0.108 V/┬░C (remarks the negative)
2- -10 ┬░C
3- -10 -25 (STC)= -35
4- -35┬░C x -0.108 V/┬░C = + 3.78 V
5- 43.1 v + 3.78 V = 46.88 VDC by module

Source: Photovoltaic Design & Installation for Dummies by Ryan Mayfield

Kent Osterberg
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Re: First try system

Post by Kent Osterberg » Mon Oct 24, 2011 12:47 pm

The 80-amp limit on the FM80 charge controller is on the output side. As Serge calculates, your system has the potential to produce much more than that. Fortunately, the FM80 will limit its output to 80 amps and prevent damage to itself. Unfortunately, the 80-amp output breaker is likely to undergo nuisance trips, unless the current limit setting of the FM80 is backed off a few amps.

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tallgirl
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Re: First try system

Post by tallgirl » Sat Oct 29, 2011 12:55 pm

I would =never= rely on the current limiting feature to protect an FM-80. A 5KW array is much more expensive than a second FM80. Adding a second FM80 adds about $0.15 per watt to the system cost -- let's not be penny wise and pound foolish.

Buy two. Be safe.
Julie in Texas

I ride bicycles. A lot.

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ROUGH72
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My RE system: FLEXmax 80, 4 CSP-225P CSI PANELS, 8-6 VOLT GC2 BATTERIES WIRED SERIES PARALLEL FOR 12 VOLT. BATTERY SPECS, 216 Ah, 115 MIN@ 75 AMPS.
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Re: First try system

Post by ROUGH72 » Tue Jan 10, 2012 7:20 am

Verry nice. Clean and well installed.
I was looking at your batteries and how you wired them, and it looks like you wired bolth pos itive and negative on the same end of the string. I have found from personal experience that this can cause unequal charging of the batteries.
E.R.Rider
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Mauricio
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Re: First try system

Post by Mauricio » Tue Jan 10, 2012 9:48 am

Very clean installation, I now want to go an clean mine up.
As for the batteries wiring, With that many parallel strings I would've connected all positives to a common point (not a battery terminal) using same length wire, and all  negatives to their common point (not a battery terminal) using same length wire. This would improve equalize  current draw from each leg.
Mauricio - Todos Santos, BCS
http://www.arribadelaroca.com

slittle@ebparks.org
Forum Junior Member
Posts: 4
Joined: Thu Oct 20, 2011 8:07 am
My RE system: 12 Kyocera 235 watt modules
Flexmax 80
GVFX3524
16 Sunextender 212 Ah AGM batteries

Re: First try system

Post by slittle@ebparks.org » Wed Jan 09, 2013 9:02 am

I finally have the funds to install the recommended additional FM80 and split the array in two. Is there a wiring diagram available to parallel these charge controllers?

Thanks for all the help!

Steve

petertearai
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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: First try system

Post by petertearai » Tue Feb 12, 2013 11:36 pm

Parallel the outputs NOT the inputs. To get them in sync as best as possible do a voltage set up with your most accurate digital volt meter. This is in the advanced menu Vbatt Calibration. Page 50 in the manual.
2220 pv. fm80. 12 times 2 volt exc shoto lead carbon 450 AH 24 volts. victron battery monitor. outback fxr 2000 watt inverter

Almousso
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3- Central do Catrão, Vale Prazeres, Fundão, Portugal
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Re: First try system

Post by Almousso » Fri Nov 22, 2013 10:55 am

Why can't i see the images displayed in this post?
It also happens with other posts as well.
Is there any particular setting i should have in order to be able to see these images?
thanks for the support.

running Mac OS X 10.6.8 and using both safari 5.1.10 and firefox 25.0.1 browsers

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MyEnergyWarehouse
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Re: First try system

Post by MyEnergyWarehouse » Mon Nov 25, 2013 4:01 am

I cannot see them either using Windows 7 and Chrome.

SandyP
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Re: First try system

Post by SandyP » Tue Nov 26, 2013 3:02 am

MyEnergyWarehouse wrote:I cannot see them either using Windows 7 and Chrome.
Same with XP,
Images are pixelated and appear as if their corrupted?

WNY DAVE
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My RE system: 2 x 230Watt Sharp Panels, FM60, Trace Inverters, 12 x 6volt Batteries, 24Volt system.

Re: First try system

Post by WNY DAVE » Sun Dec 01, 2013 12:30 pm

Pics are also pixelized on my system, can't view them.?

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