Adding solar panels

Discussion about the MX60 Charge Controller

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Adding solar panels

Postby gsubbu on Mon Jun 26, 2017 7:39 pm

Hello all , I have joined newly to this forum. I have installed a new system in Bengaluru, India.( Max temperature 39.8 and min 7.8 degree Centigrade in the past 100 years).

Usually temperature is between 25 to 30 Degree Centrigrade.


System details are as follows :-

3 kW Inverter VFXR3048E.

Charge controller MX 60.

48v system consisting of 4 lead acid batteries of 200 AH @C10 rate.

9 trina solar panels of 325 W. rigged 3 series , 3 strings.( 2925 W) MAXIMUM VOC 131V.


I have been reading up on the queries on the forum . I have been using the system for past one month.


I have space for adding three more solar panels ( 975 W).


Total watts would be 3900.


I was deliberating on two options:-


1. Swap my charge controller to MX 80 and add three panels.

or


2. Add an additional battery and go to 60 V , and add three panels.



Either way dont intend to change my inverter as i would like to oversize the panels and extract maximum output.



I would lean to the second option . Any thoughts or inputs ?
gsubbu
Junior Member
 
Posts: 3
Joined: Sun Jun 25, 2017 8:57 pm
My RE system: 3KW VFXR3048E INVERTER
FLEX MAX 60 CHARGE CONTROLLER
48 V BATTERY SYSTEM

12V, 200AH@C10 RATE - 4 IN NO RIGGED IN SERIES.Lead Acid Batteries

TRINA SOLAR 325 W- 9 IN NO

3 PANELS IN SERIES.

3 STRINGS

Re: Adding solar panels

Postby blackswan555 on Mon Jun 26, 2017 11:06 pm

Both "would work" But you already have too much panel / too little battery in the system now ? recommended is 5 to 15% of 20hr rate, You have more than double already ?
More batteries I think may be a better option ?

Tim

ps, what have you changed defaults to in settings ? absorb voltage and time ?
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.
blackswan555
OutBack Emperor
 
Posts: 2536
Joined: Sat Aug 30, 2008 5:50 am
Location: Ibiza Spain,
My RE system: Other peoples, VFX "E" versions, FLA`s, Generators.

Re: Adding solar panels

Postby gsubbu on Tue Jun 27, 2017 5:41 am

Thanks for your input. I have not changed any of the default parameters.


My system is grid tied and am exporting excess power. Hence the query to maximize the output power to the grid. Hope that explains.
gsubbu
Junior Member
 
Posts: 3
Joined: Sun Jun 25, 2017 8:57 pm
My RE system: 3KW VFXR3048E INVERTER
FLEX MAX 60 CHARGE CONTROLLER
48 V BATTERY SYSTEM

12V, 200AH@C10 RATE - 4 IN NO RIGGED IN SERIES.Lead Acid Batteries

TRINA SOLAR 325 W- 9 IN NO

3 PANELS IN SERIES.

3 STRINGS

Re: Adding solar panels

Postby blackswan555 on Tue Jun 27, 2017 9:03 pm

Sorry was assuming off grid, I do not do grid so can not help, But default settings are not good, One of the GT guys step in ?

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.
blackswan555
OutBack Emperor
 
Posts: 2536
Joined: Sat Aug 30, 2008 5:50 am
Location: Ibiza Spain,
My RE system: Other peoples, VFX "E" versions, FLA`s, Generators.

Re: Adding solar panels

Postby gsubbu on Wed Jun 28, 2017 3:21 am

Well going through the books and learnt that i cannot add a extra battery and move to 60V system as my inverter is rated only for 48 V system.


That leaves me with no option but change the charge controller and upgrade to mx 80 .


Am i correct ?
gsubbu
Junior Member
 
Posts: 3
Joined: Sun Jun 25, 2017 8:57 pm
My RE system: 3KW VFXR3048E INVERTER
FLEX MAX 60 CHARGE CONTROLLER
48 V BATTERY SYSTEM

12V, 200AH@C10 RATE - 4 IN NO RIGGED IN SERIES.Lead Acid Batteries

TRINA SOLAR 325 W- 9 IN NO

3 PANELS IN SERIES.

3 STRINGS

Re: Adding solar panels

Postby Mike Curran on Wed Jun 28, 2017 2:59 pm

Your MX60 is maxed out now (2925W ÷ 48volt system = 60amps) so changing to an FM80 is the route I would take if I were you.
Mike Curran
OutBack Guru
 
Posts: 370
Joined: Sat Aug 28, 2004 6:28 pm
Location: Chagrin Falls, Ohio
My RE system: Outback:
- 8 (2x4) Evergreen 180's into one MX60
- 6 (2×3) ALEO S79-300's into one FM80
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC
- 12 Surrette/Rolls 2V x 1766Ah
- Hub10.3, Mate3, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar:
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied.


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