Author Topic: What is better choice of Panel here on these 2? More Watts or Amps?  (Read 140 times)

73-GMC-RV

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« Last Edit: February 22, 2019, 12:49:03 PM by 73-GMC-RV »

mike90045

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Re: What is better choice of Panel here on these 2? More Watts or Amps?
« Reply #1 on: February 22, 2019, 01:16:00 PM »
Doesn't matter, it's going into a MPPT controller, right ?

 But what FITS on there is most important.
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

SuperTed

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Re: What is better choice of Panel here on these 2? More Watts or Amps?
« Reply #2 on: February 28, 2019, 04:23:03 PM »
what is the charge controller and battery voltage you ar looking at using
the 400 W ones you could setup as 3 strings of 2 for 100V (open circut) but the 425W ones would be 6 strings of 1 else the voltage would be too high for most controllers.
take a look at the string sizing tool and play around with the configs to get max power out
http://www.midnitesolar.com/sizingTool/displaySizing.php
Cheers
Off-Grid Taranaki New Zealand 39°11'21.2"S 174°00'39.1"E:  21x250Wpanels in 3 strings=5250W, Classic 150, Magnasine MS4348PE 4.3KW 230V inverter, 16xCrown CR430 in 2 strings=860AH 48V

Vic

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Re: What is better choice of Panel here on these 2? More Watts or Amps?
« Reply #3 on: February 28, 2019, 10:09:22 PM »
Generally,   for RVs,  etc,   running all PVs as singles,   in parallel, can help reduce the effects of shading.

Knowing little of the exact application,  would vote for the Sunpower 425s for this reason,  if they are available.

IMO,    Vic
Off Grid - Two systems -- 4 SW+ 5548s, Surrette 4KS25 1280 AH X2@48V, 11.1 KW STC PV, 3X MidNite Classic 150 w/ WBjrs, Beta KID on S-530s, MX-60s, MN Bkrs/Boxes.  Thanks MN for Great Products/Service/Support!