Most of your brand named, nominal 30V panels are pretty equivalent and it's hard to go wrong. You'll get a few more Watts/ft^2 with monochrystaline but I'd be more concerned with $/Watt as long as you're in 15%+ efficiency range.. You should be able to find something good in the .75$/Watt range from numberous vendors. Sun Electronics - Lowest Prices in Solar Panels, Kits, Inverters in Miami has some outrageous pricing on blemished panels and is very competative on the Grade A stuff too. A lot of people buy a pallet and sell off a few of the extra panels. I bought one of my Flexmax 80s there for about $500. I can highly recommend Outback gear as I have had very good service from my hardware.
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Two nominal 30V panels in series will charge control a 48V pack of FLA batteries quite well on a Flexmax 80 and you can gang 6-8 sets in parallel on one for nearly 4000Watts. I started this way and then added another FM80 several years later when I expanded to 5500Ws. Now I have a port and starboard array with Port and Starboard FM80s on port and starboard 48V battery banks of 8 6V GC2s each. The FM80s are coasting at about 50 amps each and I noticed the cooling fan runs a lot less now.
So far this setup has propelled a 20 ton boat over 2000 miles and is running strong.
Capt. Carter
www.shipofimagination.com
On Sunday, August 28, 2016 4:46 PM, king_of_neworleans <no_reply@yahoogroups.com> wrote:
I am in the initial preplanning stages of putting up a solar array. Just looking around, found this...
Hyundai HiS-M255RG 260w Poly Black Frame
I want to end up with about 2kw of solar power, but will start small since funds are small. Bank is 220ah 48v flooded cell. Haven't bought controller yet but a couple I am considering should charge a 48v bank okay, with PV input voltage range that should allow me to initially install a pair of these in series, for 520w rated power. That would be a significant step toward my eventual goal, and in the event of a major and lasting power outage, would at least keep me in lights and stuff. I could even move my boat with that much charging power, if I keep it low and slow. I don't mean to say that I am specifically considering buying these particular panels, just using them for an example, so feel free to pick at them and criticize and tell me why they suck, if they do. I do want to go cheap, but I decided a long time ago that I was not going to make my own panels out of individual salvaged PV cells.
The specs give an open circuit voltage of 37.7v. Would two of these in series probably work with most MPPT controllers charging a 48v bank? Would one do the job, or do MPPT controllers work best when stepping a voltage down rather than up?
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Posted by: Carter Quillen <twowheelinguy@yahoo.com>
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