Solar panels
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Mar-25-2021 07:14 PM
P max150W
V of 22.5V
I sc 9.05A
V mp 8.38A
Max system Voltage 600VDC (UL)
Max Fuse Rating 15A
Can someone please walk me true the meaning of the individual ratings meaning.
I understand that they are 150W 12V . What does the 600VDC particularly mean, I guess it has to do with how many panels can be joined?
Thanks Frank.
2012 F250 XLT
4x4 Super Cab
8' Tray 6.2lt, 3.7 Diff.
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Mar-28-2021 04:41 PM
Slownsy wrote:
I was hoping to use existing cables and go to 24V with MPPT charger and ad a couple of new panels to existing.
Frank.
4 x 22.5 = 90 volts in series. Many MPPTs are good to about 100 Voc. some will do 150 Voc (at 25C/77F--and Voc goes up when it is colder, so pushing your luck at that if you camp in the cold.
Add another couple of new panels of what size? Two more 12v of any watts will be 2 x 23(say) = 46 more Voc, so total 90 + 46 = 136 so you could do it with an MPPT that has 150 Voc limit. 46Voc in a "24v" panel will be a single big one high 3xx watts. Not sure how you "match" for voltages doing it that way.
Getting up there in amps size of controller needed for that many array watts.
IMO since you get the same amps to the battery by leaving your existing set as is, and adding a second set as mentioned before, why do all that work? YMMV of course.
on Ford E350-460-7.5 Gas EFI
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2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.
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Mar-28-2021 04:16 PM
Frank.
2012 F250 XLT
4x4 Super Cab
8' Tray 6.2lt, 3.7 Diff.
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Mar-27-2021 04:13 PM
Then set the (adjustable on each controller with many of them) charging voltages close to the same for the two controllers and wire them both to the battery bank.
They will add their amps so it is just as good for amps to the battery as having one bigger array and one controller.
Eg, in the Class C, I have a 275w panel with an MPPT and another set of three 100w in parallel with a PWM controller. The two controllers are each set to 14.6 Vbs, and add their amps as though it was one big 575w array. I can tell they are adding their amps by seeing the amps output showing on each controller's display and then look at my battery monitor and see the total amps showing there. Kind of neat.
I had three solar sets on the C for a while, but moved one set over to the TC we got.
on Ford E350-460-7.5 Gas EFI
Photo in Profile
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.
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Mar-27-2021 03:58 PM
Thanks Frank.
2012 F250 XLT
4x4 Super Cab
8' Tray 6.2lt, 3.7 Diff.
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Mar-26-2021 06:39 PM
Nice find on the link. Ty.
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.
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Mar-26-2021 04:54 PM
naturist wrote:
Um, Given that the open circuit voltage listed is 22.5 volts, you reach the limit at 26 panels in series. The 27th puts you over 600 volts.
The "real" limit is the total Voc limit rating of your solar controller, which can be say 100 volts at 77F/25C. So you can string maybe four at 22.5 each in series. But then remember that Voc goes up with colder temps (and down with higher temps) so in the cold you could fry your controller if you are near the limit for 25C.
on Ford E350-460-7.5 Gas EFI
Photo in Profile
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.
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Mar-26-2021 04:02 PM
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Mar-26-2021 09:44 AM
750 Watts Solar Morningstar MPPT 60 Controller
2014 Grand Cherokee Overland
Bob
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Mar-26-2021 08:54 AM
https://www.eaton.com/content/dam/eaton/products/electrical-circuit-protection/fuses/bussmann-series...
on Ford E350-460-7.5 Gas EFI
Photo in Profile
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.
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Mar-25-2021 10:26 PM
750 Watts Solar Morningstar MPPT 60 Controller
2014 Grand Cherokee Overland
Bob
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Mar-25-2021 08:40 PM
https://www.altestore.com/blog/2016/04/how-do-i-read-specifications-of-my-solar-panel/#.YF1XItxME2w
Open Circuit Voltage (Voc)
Open circuit voltage is how many volts the solar panel outputs with no load on it. If you just measure with a voltmeter across the plus and minus leads, you will read Voc. Since the solar panel isn’t connected to anything, there is no load on it, and it is producing no current.
Maximum Power Point (Pmax)
The Pmax is the sweet spot of the solar panel power output, located at the “knee” of the curves in the graph above. It is where the combination of the volts and amps results in the highest wattage (Volts x Amps = Watts).
V of 22.5V nominal voltage of the panel--probably best to use MPPT controller with this. If the controller can tolerate a 45 volt input, I'd wire in series/parallel.
Isc short circuit current.
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.
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Mar-25-2021 07:38 PM