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10-03-2015, 10:05 AM
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#1
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3 Rivet Member
2013 22' FB Sport
College Place
, Washington
Join Date: Jul 2012
Posts: 118
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Sizing system Panels vs Charge Controller
I have a Blue Sky solar boost 2512ix-hv with panels on the roof of my 22' Sport. I am considering setup up a 2nd set of fixed panels for use while closed in the shop for winter and want to understand the math of how to maximize the panels for this controller.
Specs:
50VDC absolute maximum (Recommend maximum VOC at STC ≤ 40VDC)*
Recommended maximum, 340W with 36 cell modules / 270W with 60 cell modules
340 watt max doesn't seem to correlate to a 25amp max. In looking at several panels, it seems like I am able to size 4x panels with a spec of 225 watts, 5.21 amps, 43.4 volts. Subtract out the losses in wiring, sun angles, etc.
Where am I going wrong here?
Thanks,
-Dwight
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10-03-2015, 05:36 PM
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#2
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2020 Classic 33
Box Elder
, South Dakota
Join Date: Oct 2013
Posts: 1,731
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600 watts of good panels would probably put out more than 25amps. With 640 on my last trailer (panels from AMSolar) is usually saw mid 30 amp inputs.
Also the panels should match very closely in voltages between you new and old panels. I think it is the Voc voltage that should be less than .5 volts difference between them. Maybe Lew if he sees this can confirm.
Also you linked panels are 43v panels, perhaps not matching what you already have.
__________________
Gary
2020 Classic 33 Twin, 2019 Ram 3500 Longhorn, ProPride
NØVPN
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10-03-2015, 06:47 PM
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#3
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3 Rivet Member
2013 22' FB Sport
College Place
, Washington
Join Date: Jul 2012
Posts: 118
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Matching the existing panels shouldn't be a problem, my plan is to unplug the roof panels, and just plug in the new ones when closed in the shop. When I go mobile, switch back to roof mounted.
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10-03-2015, 08:29 PM
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#4
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Rivet Master
Commercial Member
Vintage Kin Owner
Naples
, Florida
Join Date: Dec 2005
Posts: 7,508
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Quote:
Originally Posted by morgandc
Matching the existing panels shouldn't be a problem, my plan is to unplug the roof panels, and just plug in the new ones when closed in the shop. When I go mobile, switch back to roof mounted.
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I use a 2-position marine battery switch with an Anderson Power Pole plug set for the remote array. Wired correctly, you just flick the switch from position 1 (roof array) to position 2 (ground array), plug in the auxiliary array and you're done.
This allows for one permanent connection to the charge controller and saves a huge amount of hassle when changing arrays. Your Blue Sky 2512iX-HV will clip the battery charge amperage at 25 amps, but doesn't like to be severely overloaded with excess incoming array amperage. 400 watts is recommended, but it will work well with up to 500 watts.
For a ground-based array, look at AM Solar's GO-160 panels. 3 of these will easily do the trick for your use.
__________________
lewster
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries
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10-03-2015, 08:43 PM
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#5
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3 Rivet Member
2013 22' FB Sport
College Place
, Washington
Join Date: Jul 2012
Posts: 118
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Hows the math work out? AM Solar is out of the 160's right now.
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10-03-2015, 09:38 PM
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#6
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3 Rivet Member
2013 22' FB Sport
College Place
, Washington
Join Date: Jul 2012
Posts: 118
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Ok, I figured out my confusion.... the limit is 25amps out, so it depends on your output charging voltage as to what the amps is going to be based on the wattage incoming.
Thanks.
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10-03-2015, 10:53 PM
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#7
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Rivet Master
Commercial Member
Vintage Kin Owner
Naples
, Florida
Join Date: Dec 2005
Posts: 7,508
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The GO-160s have a I(MPPT) of 8.65 amps while the SF-100s have an I(MPPT) of 5.55 amps. During solar noon with the panels perpendicular to the sun, you should see about 27 amps from 3 GO-160s and 30 amps from 5 SF-100s. Either arrangement will probably max out your controller at 25 amps to the batteries.
__________________
lewster
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries
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10-04-2015, 06:10 AM
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#8
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3 Rivet Member
2013 22' FB Sport
College Place
, Washington
Join Date: Jul 2012
Posts: 118
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Is there a spec listed that tells you how many watts you can have hooked up without damaging the controller, or just experience that you have with it specifically?
-Dwight
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10-04-2015, 10:56 AM
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#9
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Rivet Master
Commercial Member
Vintage Kin Owner
Naples
, Florida
Join Date: Dec 2005
Posts: 7,508
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Quote:
Originally Posted by morgandc
Is there a spec listed that tells you how many watts you can have hooked up without damaging the controller, or just experience that you have with it specifically?
-Dwight
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Should be listed in the Blue Sky manual. I'll check one tomorrow when I'm back at the shop.
__________________
lewster
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries
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10-04-2015, 11:58 AM
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#10
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Rivet Master
1999 34' Excella
Joshua
, Texas
Join Date: Apr 2002
Posts: 548
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You'll get better performance with a Morningstar Tristar MPPT...
__________________
History doesn't repeat itself, people do!
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10-04-2015, 02:41 PM
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#11
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Rivet Master
Commercial Member
Vintage Kin Owner
Naples
, Florida
Join Date: Dec 2005
Posts: 7,508
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Quote:
Originally Posted by Dwight
You'll get better performance with a Morningstar Tristar MPPT...
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Not really! Can you quote your source for that statement?
If you look at the hard technical specs, the Blue Sky controllers do their MPPT sampling at much quicker intervals, yielding more MPPT charge boost.
That reason, and the quick and easy process of adding more charge controllers in parallel are two of the main reasons that we (AM Solar) stopped offering Morningstar MPPT controllers.
Lew Farber
RVIA/RVDA Nationally Certified Master Tech
Master Tech Energy Systems, Inc.
AM Solar Certified Installation Center
Lifeline Batteries**Magnum Inverters
541-490-6357
__________________
lewster
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries
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10-04-2015, 03:17 PM
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#12
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Rivet Master
1999 34' Excella
Joshua
, Texas
Join Date: Apr 2002
Posts: 548
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I have used both brands. I prefer Morningstar. Just let everyone do their own research and have their own opinion. I'm not going to argue with you.....and I don't have to substantiate my choice.
__________________
History doesn't repeat itself, people do!
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10-04-2015, 03:41 PM
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#13
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Overland Adventurer
1991 34' Excella
2009 34' Panamerica
Telluride
, Colorado
Join Date: May 2012
Posts: 2,476
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X2^ on the Morningstar, Morningstar anything!
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10-04-2015, 06:54 PM
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#14
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Rivet Master
Commercial Member
Vintage Kin Owner
Naples
, Florida
Join Date: Dec 2005
Posts: 7,508
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Quote:
Originally Posted by Dwight
I have used both brands. I prefer Morningstar. Just let everyone do their own research and have their own opinion. I'm not going to argue with you.....and I don't have to substantiate my choice.
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That's very true......YOU DONT!!! Folks can do as they please, but when you state that one product is better than another, it is always appreciated to give the specifics or some hard data behind your statement....... or it becomes a thread about which oil to use.
Lew Farber
RVIA/RVDA Nationally Certified Master Tech
Master Tech Energy Systems, Inc.
AM Solar Certified Installation Center
Lifeline Batteries**Magnum Inverters
541-490-6357
__________________
lewster
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries
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10-04-2015, 07:09 PM
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#15
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Rivet Master
1999 34' Excella
Joshua
, Texas
Join Date: Apr 2002
Posts: 548
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I agree Lew. My system is about 10 years old.....I tried Blue Sky and didn't like the performance....then I tried the other and liked it.
Anyone can do a simple Google search on "blue sky or morning star mppt" and read all the threads out there. I'm not going to requote what anyone can read. I think folks should do there own fact finding and choose from what they want or can afford.
__________________
History doesn't repeat itself, people do!
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10-04-2015, 07:13 PM
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#16
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Overland Adventurer
1991 34' Excella
2009 34' Panamerica
Telluride
, Colorado
Join Date: May 2012
Posts: 2,476
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I had a string of disappointing Blue Sky failures.... Jumped ship after being stranded.
Been using morningstar for a while with 0 issues or failures. Much happier with performance and zero failures!
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10-05-2015, 09:57 AM
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#17
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3 Rivet Member
2013 22' FB Sport
College Place
, Washington
Join Date: Jul 2012
Posts: 118
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Thanks
Thanks,
At this point I have the controller, and am looking for understanding so in the future I can appropriately size both panels and controllers.
-Dwight
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10-05-2015, 09:45 PM
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#18
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3 Rivet Member
2013 22' FB Sport
College Place
, Washington
Join Date: Jul 2012
Posts: 118
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Lew, did you find that spec?
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10-05-2015, 10:38 PM
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#19
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Rivet Master
Commercial Member
Vintage Kin Owner
Naples
, Florida
Join Date: Dec 2005
Posts: 7,508
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Quote:
Originally Posted by morgandc
Lew, did you find that spec?
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The manual says a maximum of 340 watts of 36 cell panels at STC. IIRC, you have 32 cell panels (AM Solar's GS-100) and their recommendation is 400 watts max. I have used 480 watts (3-GO-160 watt panels) into the 2512iX-HV with no issues.
The manual also states that you should calculate a derating factor of 1.25 for NOC (normal operating conditions) which would bring a 425 watt array right to the recommended 340 watts.
Also remember that while Blue Sky doesn't like over capacity at the input of the controllers, they WILL accept it and simply clip the output amperage to the batteries at 25 amps. A typical solar array will only be producing maximum output for a short period as the sun's azimuth changes with regard to the panels' surface........... unless you employ an automatic solar tracking device that always points your array towards the sun at the optimum angle for maximum solar radiance.
__________________
lewster
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries
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10-06-2015, 05:32 AM
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#20
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3 Rivet Member
2013 22' FB Sport
College Place
, Washington
Join Date: Jul 2012
Posts: 118
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Thanks. Part of me says that I want to know what is max safe watts while "clipping", the other part of me says why....controllers are not expensive, size it right and use every ray of sun on a limited footprint install.
Thanks for the input as always, and I am still loving my crazy over done solar install. Nothing like being able to run my microwave off solar whenever I want. Now if my batteries would quit living forever so I can get some lithiums. Of course, at only 3 years on the AGM batteries I expect quite a few more years, and I am not looking forward to getting them out from under that dinette seat on my sport.
-Dwight
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