Author Topic: (5) Midnite Classic 250s required???  (Read 214 times)

David

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(5) Midnite Classic 250s required???
« on: October 15, 2017, 10:49:52 AM »
Wanted to get sanity check on this theoretical setup for an off-grid system using (50) Kyocera KU265 panels; Voc: 38.3V, Isc: 9.26A

- (5) top-of-pole mounts with (10) KU265 wired 5 in series, 2 parallel strings on each mount (191Voc, Isc ~19A per array)
- Distance to mounts 350ft+ one way using 4ga. aluminum
- 48V battary bank

Because of the excessive distance to the panels with 4ga. aluminum they would be wired 5 in series for 191Voc. From the string sizing tool it is showing 5 Midnite Classic 250s would be required along with 5 combiner disconnects at each array and 5 separate disconnects where it enters the home.

Is there some way to simplify this setup?

The only "simplification" I could come up with is doing 3 in series and 5 parallel strings for 114.9Voc and Isc of 46.5A and increase to 60 panels. This would require "only" 4 Classic 150s that would handle 60 panels but require a lot of 1/0 Al cable for 6.3% wire loss for each 15 panel loss.

Westbranch

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Re: (5) Midnite Classic 250s required???
« Reply #1 on: October 16, 2017, 10:56:34 PM »
a screen capture of the MN sizing app result and your approx. location would help fill in the picture a bit.  ;)
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mike90045

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Re: (5) Midnite Classic 250s required???
« Reply #2 on: October 29, 2017, 08:41:05 PM »
Schneider & Morningstar both make solid 600v solar MPPT Charge controllers.  but they are not classics
http://tinyurl.com/LMR-Solar

Classic 200| 2Kw PV, 160Voc | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph )| Listeroid 6/1, st5 gen head | XW6048 inverter/chgr | midnight ePanel & 4 SPDs | 48V, 800A NiFe battery bank | MS-TS-MPPT60 w/3Kw PV

KyleM

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Re: (5) Midnite Classic 250s required???
« Reply #3 on: October 30, 2017, 11:10:19 AM »
a screen capture of the MN sizing app result and your approx. location would help fill in the picture a bit.  ;)

Yes, getting a peek at the results would go a long way to getting a solution for you.

Kyle M
« Last Edit: November 21, 2017, 01:26:31 PM by KyleM »

greysunusc

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Re: (5) Midnite Classic 250s required???
« Reply #4 on: November 18, 2017, 07:32:17 PM »
I'm not the original poster, but I have a similar issue.

I have 52 330w BlueSun Solar panels.  I'm not married to the number I could drop as low as 48 panels and still make my generation needs, but I'm trying to make the most use possible.  I'm in Phoenix so those temps are pretty standard.


CDN-VT

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Re: (5) Midnite Classic 250s required???
« Reply #5 on: November 30, 2017, 02:37:01 AM »
Increase strings & drop to 3 in series ., You will still need more combiners than 12 @ that posted PDF.
So twin 12 Combiners work well .


VT
Canadian Solar 350W 37.6 VOC  30.6 VMP 8.22 ISC 7.87 IMP ,-15 c +30c max  4 strings in 2 in Series for 24v Classic 150 -1020 Ah  Freezers & fridges ~~~ Second Array same panels of 3sx3 parallel for 24 V Classic 150 -440 Ah Outback Barns & out blds.
48Vdc almost done.