String Sizing Tool for MX and FM Charge Controllers

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Re: String Sizing Tool for MX and FM Charge Controllers

Postby ecabret on Wed May 19, 2010 3:41 pm

HELLO I AM NEW TO THIS FORUM, I HAVE A QUESTION. WHAT KIND OF PV EQUIPMENT DO I NEED TO BE ABLE TO RUN A 220 18K BTU AIR CONDITIONING FOR 24 HOURS A DAY, IN PUERTO RICO, USA. THANK YOU VERY MUCH FOR ANY HELP YOU MAY GIVE ME. HAVE A NICE DAY EVERYONE. SINCERELY ENRIQUE CABRET.
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Re: String Sizing Tool for MX and FM Charge Controllers

Postby som123 on Wed May 18, 2011 4:39 am

hello,
I am new in this forum so please help me in acknowledging this forum.





regards
som123 :smile: :smile:
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Re: String Sizing Tool for MX and FM Charge Controllers

Postby michaelkiera on Tue Nov 22, 2011 5:26 am

if a module has a TkVoc of -0.120 V per C this means that, for each C below 25C, the module voltage will increase by by 0.120 volts. If you havw a module with a TkVoc given in % per C, mulitply this TkVoc by the modules open-circuit voltage (Voc). A module with a Voc of 39.9 volts and a TkVoc of -0.36% per C will have a 1.333 voltage increase for each degree below 25C.
Source: homepower mag 146, pg34


Four new panels by Trina Solar - specs from own website datasheet
The 275w retails for $415 ??


eleCTrICAl DATA @ STC
TSM-270 PC/PA14 ----- TSM-275 PC/PA14 ----- TSM-280 PC/PA14 ------ TSM-285 PC/PA14

Peak Power Watts-PMAX (Wp) 270 275 280 285
Power Output Tolerance-PMAX (%) 0/+3 0/+3 0/+3 0/+3
Maximum Power Voltage-VMP (V) 35.5 35.6 36.0 36.3
Maximum Power Current-IMPP (A) 7.60 7.73 7.78 7.86
Open Circuit Voltage-VoC (V) 44.3 44.3 44.4 44.8
Short Circuit Current-ISC (A) 8.25 8.27 8.33 8.36
Module Efficiency ηm (%) 13.9 14.2 14.4 14.7
Values at Standard Test Conditions STC (Air Mass AM1.5, irradiance 1000W/m², Cell Temperature 25°C).

Maximum Power (W) 197 200 204 208
Maximum Power Voltage (V) 32.3 32.4 32.8 33.1
Maximum Power Current (A) 6.08 6.18 6.22 6.29
open Circuit Voltage (V) 40.6 40.6 40.7 41.1
Short Circuit Current (A) 6.68 6.70 6.75 6.77

TeMPerATure rATIngS
nominal operating Cell
Temperature (noCT) 46°C (±2°C)
Temperature Coefficient of PMAX - 0.44%/°C
Temperature Coefficient of VoC - 0.33%/°C
Temperature Coefficient of ISC 0.046%/°C

[b]Still trying to figure out Vtoc / Vtmp conversion -
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Re: String Sizing Tool for MX and FM Charge Controllers

Postby lonewolf on Wed Dec 07, 2011 3:14 pm

apparently this 'tool' will NOT run from a MAC OS-X platform - Oracle has NO version of JRE available for 10.4 or later.

So, I'm planning to increase my PV array. And add another FM80. The panels on my current system are no longer available. Seems as though the best price per watt right now is Canadian Solar's 230W, VP 23.9, Voc 36.8, Isc 8.34, Imp 7.78 at $1.04/W So, how many such panels can the FM80 handle (in a very cold climate) for a 12V 'system' and how should they be configured? - Anyone? Also, do I "need" to buy a Mate to have two FM80's charging a 12VDC battery bank?
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Re: String Sizing Tool for MX and FM Charge Controllers

Postby tallgirl on Thu Dec 08, 2011 8:13 pm

Lone,

Blame Apple -- Oracle doesn't make JREs for all the platforms and Apple is the company that should be providing it for you. Note that 10.4 is =ancient=. Unless you're running a PowerPC processor, you should be able to upgrade to Leopard or Lion or something else a bit more modern than what you have.

You have 18 volt nominal panels. The maximum array size for a FM-80 on a 12 volt system is 80 amps at EQ, which is around 16 volts. That gives you 1,280 watts or 5 panels. Vmpp of 23 is more than adequate for charing and well below any voltage where the temperature correction for cold weather would be an issue. Based on that, 5 panels in parallel would be my answer.

To answer the Mate question, no, you do not need a Mate to get the charge controllers working. If you'd like to avoid the Hub as well, you'd just need to make sure all the devices have their own battery temperature sensor.
Julie in Texas

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Re: String Sizing Tool for MX and FM Charge Controllers

Postby lonewolf on Fri Dec 09, 2011 5:40 pm

thanks - I assumed 5 of such panels would be the maximum but that an odd number wouldn't work for series-parallel and also 'thot' that 5 in parallel would present too high current. So all in parallel eh?. Makes for lots of (10) wire runs!
RE Apple - yes its PPC so 10.4.11 is the latest OS. Works great (does what I want). Upgrade will happen when I can but for right now (foreseeable future) greater PV capacity has far higher priority.
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Re: String Sizing Tool for MX and FM Charge Controllers

Postby joea707 on Fri Dec 30, 2011 11:55 am

Has anyone had any luck running the string sizing tool on an android phone? I can not get java jre to run on my Motorola Electrify.
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Re: String Sizing Tool for MX and FM Charge Controllers

Postby eryvcj on Sat Jul 14, 2012 12:26 am

Morgan,

If you run the string sizing tool, you'll see that the 12 modules you have are already pushing the limits of the FM80. It sounds like you should be getting more from the PV modules. Figuring out why the power output is low may help to get your production in line with your energy use. More information about the PV array is needed. What is the module brand and model? How many in series and parallel? What is the tilt angle? What is the azimuth angle? How is the array mounted? Where is it located? Latitude and longitude? The charge controller settings and inverter settings can also affect the power you'll get.



-------------------------------



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Re: String Sizing Tool for MX and FM Charge Controllers

Postby fixfox on Fri Feb 22, 2013 1:48 am

administrator wrote:A member of our Technical Service group (forum Username Erik) has written a string sizing applet for the MX60 and FM80. I've temporarily posted it at the following location: String Sizing Tool. Eventually it will be moved to under the Resources tab on our website.

If you have any comments or panels that you would like to add to the database, feel free to post them in this thread, or email them to support@outbackpower.com .

For Panel additions please include the following info:
  • Manufacturer Name and model number
  • Voc (Open Circuit Voltage)
  • Vmp (Maximum power voltage
  • Isc (Short circuit current)
  • Imp (Max. power current)
  • Vtoc (Voltage Temp Coeff)
  • Vtmp (Max. power Temp Coeff
  • Watts (Watts STC)
Scott


Can you please add the following....

Manufacturer: Senersun
Panel Model: SSM36A-100*

Open circuit voltage - Voc: 22.6
Max power voltage - Vmp: 18.38

Short circuit current - Isc: 5.87
Max power current - Imp: 5.44

Voc Voltage temperature coefficient - Vtoc: 0.3
Vmp Power temperature coefficient - Vtmp: -0.43%

Watts (STC) : 100W

Link to module spec sheet:
http://www.senersun.com/sites/default/files/SSM36A.pdf


Thanks.....
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Re: String Sizing Tool for MX and FM Charge Controllers

Postby WNY DAVE on Sun Nov 10, 2013 6:37 am

Link for sizing tool does not work.

I see they have changed the path, there is a link on the OUTBACK site.

http://www.outbackpower.com/index.php/o ... izing-tool
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Re: String Sizing Tool for MX and FM Charge Controllers

Postby Vic on Tue Jul 08, 2014 9:08 pm

Thanks Dave, but that link is now broken, too ... VIc
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Re: String Sizing Tool for MX and FM Charge Controllers

Postby klundquist on Wed Jul 09, 2014 7:45 am

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Re: String Sizing Tool for MX and FM Charge Controllers

Postby fred2258 on Sun Jul 20, 2014 1:33 pm

Clipboard-1.jpg
Screen shot of tool


How come the string sizing tool recommends a max watts of 2000 at 24V and the manual recommends a max of 2500 watts?
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Re: String Sizing Tool for MX and FM Charge Controllers

Postby klundquist on Mon Jul 21, 2014 7:33 am

Because 2,500 watts of solar is not very realistic amount of power when you have an 80 amp output limit on a 24 volt system. If we divide 2500 watts by 24 volts the product is over 104 amps. That is 25% more amps than the FM80 is rated for. Even 2000 watts of solar can produce more than 80 amps of output at 24 volts. The updated manual page 98 lists maximum size as 2,000 watts with the FM80 on a 24 volt battery bank. http://www.outbackpower.com/downloads/d ... manual.pdf

If you divide the 2,500 watts by 80 amps you find the battery bank would need to be at 31.25VDC or greater. That is pretty hot for most lead acid battery banks.

For best efficiency and longest life I like to under size the amount of PV by multiplying the battery bank low voltage by the charge controller output rating. 21VDC is the low voltage for a 24 volt system. 21VDC x 80amps = 1,680 watts.

8 of the REC Solar 240 watt modules is the maximum I would recommend if you are only using one charge controller.
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