solar panels with different angles on one CLASSIC

[ultraschall81]

Hi all,

I have ~2350Wp (12x195Wp, 36Vmpp, 5,5Ampp) Solar Panels connected to three CC's. Since they have a SW-defect, I will send them back and get my money back.
Now I'm looking to buy a MN Classic 150 CC although there is no distributor in germany. I can order it in spain.

My Problem is, I have 3 Solar fields with 2 different angles.
1st field: 4 parallel connected Panels without shading (35°)
2nd field 4 parallel connected Panels with partial shading in the afternoon (35°)
3rd field 4 parallel connected Panels without shading (10-15°)

Can I connect them together to one classic 150 without much loss due to different angles?
I don't want to buy a second CC for only 780Wp.

Battery is a 25,6V (8x3,2V) 200Ah LiFePo. Charge end voltage is ~ 28,2-28,4V. Is it ok to have only one modul in a "string" (1s12p)? How is the efficency if the Vmpp is only slidly high than the battery voltage? If possible I don't want to rewire the panels to 2s6P becaus of shading.
Thanks for your help.

regards

Ultraschall

[Westbranch]

how far is the CC going to away from the array, and the battery bank?
what gauge of wire from the array to the CC?
will you use combiner boxes?
what was the PV voltage sent to the CCs you are changing out?

[ultraschall81]

Pv to cc is Arrond 20-30m, cc to battery 1m.

2 Panels are connectet in parallel to a 6mm2 wire String ; so 6 Strings for 12 Panels
I created a combiner Box where 2 Strings/4 Panels are combined to a 10mm2 wire going to One charger. This i have three Times.
4 Panels in parallel are going to a 40 A CC.

[zoneblue]

1 panel strings with 36Vmpp on a 24 volt system is tight mate. The classic needs about 50% headroom i think, so during absorb in low light conditions, you will lose power.

And, 30m of cable, at 24V... ouch. It would have to be jolly big cable.

3 panel strings will help on the wire loss, but IMO add worse losses to the controller.

Hence i would be going strings of two panels on the 150.

If you really are starting again, then theres other options, a higher voltage controller, ac coupling to name two.

[zoneblue]

Have you measured your vdrop?

I worked out for 2.4kWp at 30m, 4 strings of 2 panels, youd need 35mm2 cable to get the vdrop below 1.5%.  And thats still 35W loss.

Also check out the NAWs forum for more help on general design. Its brilliant.

Pv to cc is Arrond 20-30m, cc to battery 1m.
2 Panels are connectet in parallel to a 6mm2 wire String ; so 6 Strings for 12 Panels

[ultraschall81]

Thanks for your reply.
I also would prefer a string with 2 or 3 panels but did this configuration because of shading.
Here you can find some older pictures of the roof: http://www.photovoltaikforum.com/inselanlagen-f57/hybridinsel-in-planung-t88942.html
Now, there are 6 Modules on top of the roof (over the dormer) and two panels righthand the dormer.
In the afternoon I become shading from the chimney and the dormer.
If I connect the panels in series of two, the string has no power, if the shadow reaches one of them. In my configuration, the second (unshaded) panel still has full power.

I haven't measured the vdrop. On the roof, two panels are connected and the cable to the basement is 6mm². This should not have to much loss. (6 times 6mm²=36mm²;  even better than 35mm²)
In the basement, the cables end in fuses/switches and are combined to 780Wp per charger with 10mm² cable.

With the new classic, I will connect all of them togeter to the input of the classic.
I was wondering if the classic can handle panel fields with different angles well.

Here you can see the combiners, chargers, batteries and inverter. Unfortunately they are upsidedown. (Thanks to the Ipad )
http://www.photovoltaikforum.com/inselanlagen-f57/hybridinsel-in-planung-t88942-s30.html (scroll down)

The yellow cables are lan cables and not part of the solar system