Wire in Series then all wired together in Parallel

I have a victron mppt 100/20 controller I was wondering about doing a series and parallel connection with my 200w 24v pannels
If I do just 2 in series it will be about
75V
5.4A
So was wondering could I just add a 2nd string and get
75V
11A
I dont see why it would not work but I cant find any info on anyone saying not to do it only thing people say is dont go over the max V
Thank you
If I do just 2 in series it will be about
75V
5.4A
So was wondering could I just add a 2nd string and get
75V
11A
I dont see why it would not work but I cant find any info on anyone saying not to do it only thing people say is dont go over the max V
Thank you
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Comments
2 in series
2 in series
and then paralleling those 2 groups of panels to get 75V, 11A
would be just fine for most charge controllers. You have to verify your panels Voc when cold, would
not exceed the max voltage input for you controller.
Remember, 75V max power, closer to 95V open circuit on a cool morning. Many charge controllers
have a sizing tool on their website, to verify you wont exceed the limits
shorthand: 2S2P for your panel arrangement
75V, 11A = 825 watts. 12V = 69A output from controller. 24V = 34A output
Following screen shot shows MPPT controller converting high voltage ( 79.2v) from solar,
to lower voltage & higher amps to the battery
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-Lister ,
So an important question is what is your system/ battery bank voltage?
- Assorted other systems, pieces and to many panels in the closet to not do more projects.
- 800 Watt array * 0.77 panel+controller deratings * 1/14.5 volts charging = 42.5 Amps
- 800 Watt array * 0.77 panel+controller deratings * 1/29.0 volts charging = 21.2 Amps
So, with a 20 Amp MPPT controller (max output charging current)--You are losing around 1/2 of the potential array harvest on a 12 volt battery bank.On a 24 volt battery bank--Pretty much maxing out the 20 Amp charge controller (which is just fine--You are losing only a very small amount of total harvest).
The present controller will work fine--But adding a second array on cool/clear days around noon--You are losing quite a bit of harvest potential. A second 20 amp controller or >~40 Amp MPPT controller would be a better fit long term.
And as Mike says/asks... How cold of weather are you planning on... If you are in seriously cold weather (well below freezing), your array could easily exceed 100 VDC Voc-array (voltage open circuit) limit of your present charge controller.
Need the exact Vmp/Imp/Voc/Isc of your panels and what is the minimum temperature your array is expected to experience?
-Bill
I was figuring it would work fine with a 24v system 2 sets of 2 x 200W panels
I currently only have 2 of the 200W panels but planning to get more and glad I dont need to get a 2nd controller for that set.
Thank you for your help