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Post by bosnianbill on Jan 4, 2016 6:39:02 GMT -8
I have the 800w premium kit (8 100w panels) with the 40A MPPT Charge controller and two UB-40D 200Ah batteries I will connect on series for 24v. My mounting location choices are limited and the panels will be partially shaded and I understand connecting the panels in series is not a good idea.
My question: How do you recommend I connect the panels for the best performance?
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Post by oldhome7 on Jan 4, 2016 19:41:48 GMT -8
If there will be shade, parallel seems to be the best choice for wiring. An MPPT controller, from what I've read and gathered, can sense the differing outputs and still track for the best output that way.
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Post by bosnianbill on Jan 5, 2016 9:47:24 GMT -8
I was kind of hoping the Renogy guys would offer up a specific configuration. Yes, I have the 40A MPPT CC. But since I have a 24v battery array, I can't just hook up the 8 panels in parallel since that results in only 12v (can I?). Which would be more efficient:
1. Connect 4 series-connected pairs in parallel (24v)
2. Connect 2 series connected groups of 4 panels in parallel (48v) - don't even think the 40A MPPT will accept 48v
3. or ??
Thanks!
bill
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Post by spiderbob on Jan 5, 2016 10:46:39 GMT -8
How about a series of 2 or 4 and then hooking those that are in separate series in parallel. Keeping your 24v.
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Post by bosnianbill on Jan 5, 2016 12:02:03 GMT -8
Yes, I think I mentioned those options in #1 and #2 above. Is one better than the other? Why? Are there other options that might be better?
Restating information I've already given doesn't help me very much...
Renogy?
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Post by spiderbob on Jan 5, 2016 12:26:08 GMT -8
Sorry about that, I read the first message as it comes to me, my bad should have read all. I have nothing to add. I can tell you the guys at Renogy, are busy, they don't monitor all day, perhaps tonight you will get a message. Or, you can send a message direct to them using the contacts.
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Post by peggy and frank on Jan 5, 2016 16:45:25 GMT -8
in our situation. to me it is a matter of do you want 12 volt or 24 volt or higher. with 24 volt or higher there is nothing you can hook to the system that is 12 volt. with 24 volt system it is complete reliability on the inverter.
is it more efficient to go from dc to ac back to dc? that is if you were to use the system for 12 volt. if you never plan to use the system for 12 volt then go higher for efficentcy. if you plan to use it for 12 volt than stay at 12 volt.
our panels run at 54 volts dc in series then switched to 12 volt times 3 amp output.
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Post by Admin on Jan 7, 2016 10:19:41 GMT -8
Hello Bill,
I am sorry for the delay. Looking at your set up I would recommend connecting the panels in sets of 2 so wire 2 panels in series then parallel all 4 sets of 2 panels in series. This will give you about 37.8 volts and 21 amps going into the controller.
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