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How much power should 265 watt grape solar panels put out?
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To answer the other half requires a lot more information... what do you plan to do with them?CS6P-260P/SE3000 - http://tiny.cc/ed5ozx -
Did you check out the one review for those panels. The person indicated that the 265watts was calculated using the open circuit voltage Voc time the short circuit amperage Isc. That is wrong
A panel wattage is determine by the max power voltage Vmp times the max power amps Imp. I did not see any mention of the Vmp or Imp for those panels so beware they might not be what they claim to be.Comment
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Did you check out the one review for those panels. The person indicated that the 265watts was calculated using the open circuit voltage Voc time the short circuit amperage Isc. That is wrong
A panel wattage is determine by the max power voltage Vmp times the max power amps Imp. I did not see any mention of the Vmp or Imp for those panels so beware they might not be what they claim to be.CS6P-260P/SE3000 - http://tiny.cc/ed5ozxComment
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After a little research I found the manufacture specs. Vmp = 31.2 Imp = 8.5, Pmax = 265 watts. The numbers jive. However you will never see that wattage, and if you look at the specs they will tell you that because they also specified the PTC rating which is real world application of PTC = 236 watt and efficiency listed as 19%MSEE, PEComment
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The data sheet is on the right hand side of the product page, where it normally is for Home Depot stuff. It looks fine, the person commenting was wrong, and I flagged that review.Comment
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So should you take off about 20 to 30 percent and you have your real world
watt output?
I am curious to how many watts you really should get out of a solar panel?Comment
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Look for the PTC or CEC rating. If your panel does not have either PTC or CEC rating pass it up. The Grape solar panel has a PTC rating.MSEE, PEComment
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For a location near you - a 1 kW DC system which is about like 4*265 watt panels
1,358 kWh per Year *Requested Location Weather Data Source (TMY2) MOBILE, AL 43 miLatitude 30.68° N Longitude 88.25° W DC System Size 1 kW Module Type Standard Array Type Fixed (open rack) Array Tilt 20° Array Azimuth 180° System Losses 14% Inverter Efficiency 96% DC to AC Size Ratio 1.1 Average Cost of Electricity Purchased
from Utility0.11 $/kWh Initial Cost 3.70 $/Wdc Cost of Electricity Generated by System 0.22 $/kWh
RESULTS
3.51 89 10 4.33 99 11 5.00 120 13 5.58 131 14 5.67 133 15 5.63 126 14 5.39 124 14 5.30 122 14 4.95 111 12 5.06 122 13 3.75 90 10 3.68 92 10 4.82 1,359 $ 150 [SIGPIC][/SIGPIC]Comment
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My 230w poly peaks around 216w. My 245w mono's peak around 220w. So 236w from the 265 panel sounds pretty normal.Comment
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Do you have to have all the same kind of solar panels on one charger conroller?
Say if you got some mismatch panels that are 30v and some 36v.
Seem like they would fight each other.
If the charge controller goes up to 55v.Comment
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There is a rule of thumb that applies to MPPT CCs, namely that if you are putting panels in series (which you cannot do with your low input limit) you need to match Imp values within 5%, 10% if you are willing to accept larger losses for a good reason.
If you put panels in parallel, then you need to match Vmp within 5% instead.
In your case the mismatch is close to 20%, and you will lose a lot of power by paralleling the panels.
If the MPPT algorithm of the CC is particularly simple, you might not get any contribution from the lower voltage panels at all because their Voc is lower than the Vmp of the higher voltage panels.
Now if you have a PWM controller (or a fake MPPT controller) you will not lose any more power than you would from the bad voltage mismatch of both sets of panels to the 18V Vmp ideal.SunnyBoy 3000 US, 18 BP Solar 175B panels.Comment
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Is it ok to run 2 charge controllers on same battery bank?Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-ListerComment
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