what should the peak amperage be

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what should the peak amperage be

Postby Daak on Wed Oct 11, 2017 5:53 pm

hello all
I have a little bit of a trivial question for you all. my system says at peak power the voltage output of the panels is 18.3v per panel and peak current should be 11.43 amp. do these two directly reflect one another? I have 6 panels putting out "18.3" peak power (109.8v system out put peak power according to specs) actual voltage is 107- 127 but the current is always low 2-4 amps, if I am hitting max voltage at peak power why are my amps so low always?
Daak
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My RE system: I operate 5 off grid cabins in US Navy campground in Japan. The systems we use consists of a OUTBACK Power system: FLEXmax 80 charge controller, VFX 3024j (24 to 100v 50Hz) Inverter, MATE2 and MATE3 and a FLEXnet DC hub with 16 battery/92 Ahr battery bank @ 24v. 4 of our systems were purchased in 2010 and 1 system was purchased in 2016 (hence the MATE2 and MATE3). I just completed the OutBack certification on June 6-9 of 2017. this does by no means makes me an expert I am still new to solar. if you have questions about the training please feel free to ask, in my opinion it is well worth the $499.00 in my case it verified much of what I thought I knew and made me much more comfortable diving into our systems.

Re: what should the peak amperage be

Postby petertearai on Wed Oct 11, 2017 8:43 pm

Depends on lots of things , but seems low . . Panell angle to sun , compass direction to sun,. loads on system , health of batterys , a bad panel in a string will drop the whole string down .
a visual look at panels to start with , check all connections . Try a big load at midday sun and see if the system will increase output .
2220 pv. fm80. 4times rolls 450 ah 24 volts. victron battery monitor. outback fxr 2000 watt inverter
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Re: what should the peak amperage be

Postby blackswan555 on Thu Oct 12, 2017 12:17 am

my system says at peak power the voltage output of the panels is 18.3v per panel and peak current should be 11.43 amp. do these two directly reflect one another?
Yes, that gives you wattage ( to be more correct VA, But W is good enough) 18.3 X 11.43 = 209.65W, So you should have roughly 1200w of panel with six, Taking that back to amps, a possible peak of around 50 amps in ideal conditions (STC, what it is on the label, perfect sun angle, 25c, 1000w per sqm of insolation) But as mentioned,, It depends on a lot of things,,,
Try Peters suggestions first, After checking everything visually, do a good load on midday sun, See what happens there, When you have it reading "something reasonable" Get a thick blanket/towel/tarp etc and cover each panel in turn and see how much you lose, It should roughly be the same on each.

Tim
ps what make and model panels and batteries ?
My comments are based on my experience and research, They are not endorsed or checked by Outback.I am an independent British electrician living in Spain, So please take this into account when reading /acting on my post`s.
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Re: what should the peak amperage be

Postby Daak on Thu Oct 12, 2017 3:37 pm

The panels we are using are:
Evergreen Solar
ES-A-210-FA2
String ribbon panels

Specs:
Electrcial Characteristics
Standard Test Conditions (STC)1
Pmp2: 205 Watts
Ptolerance: -0/+4.99 Watts
Pmp, max 209.99 Watts
Pmp, min: 205.00 Watts
Nmin: 13.1%
Pptc3: 185.2 Watts
Vmp: 18.4 Volts
Imp: 11.15 Amps
Voc: 22.8 Volts
Isc: 12.10 Amps

Nominal Operating Cell
Temperature Conditions (NOCT)4
Tnoct: 44.8°C
Pmax: 150.1 Watts
Vmp: 16.8 Volts
Imp: 8.93 Amps
Voc: 20.7 Volts
Isc: 9.68 Amps
1 100 W/m2, 25°C cell temperature, AM 1.5 spectrum;
2 Maximum Power Point or rated power
3 At PV-USA Test Conditions: 1000 W/m2, 20°C ambient temperature, 1 m/s wind speed
4 800 W/m2, 20°C ambient temperature, 1 m/s wind speed, AM 1.5 spectrum

Low Irradiance
The typical relative reduction of module efficiency at an irradiance of 200W/m2 both at 25°C cell temperature and spectrum AM 1.5 is 0%

Temperature Coefficients
αPmp: -0.45 %/°C
αVmp: -0.43 %/°C
αImp: -0.02 %/°C
αVoc: -0.32 %/°C
αPmp: -0.003 %/°C

System Design
Series Fuse Rating5 20 Amps
Maximum System Voltage (UL): 600 Volts
5 Also known as Maximum Reverse Current

Mechanical Specifications
Dimensions: 65.0'' x 37.5'' x 1.8" (1651 x 953 x 46 mm)
Weight: 40.0 lbs (18.18 kg)

Product constructed with 114 poly-crystalline silicon solar cells, anti-reflective tempered solar glass, EVA encapsulant, polymer back-skin and a double-walled anodized aluminum frame. Product packaging test to International Safe Transit Association (ISTA) Standard 2B. All specifications in this product information sheet conform to EN50380. See the Evergreen Solar Safety, Installation and Operation Manual and Mounting Design Guide for further information on approved installation and use of this product.
Daak
Member
 
Posts: 9
Joined: Wed May 31, 2017 7:40 pm
My RE system: I operate 5 off grid cabins in US Navy campground in Japan. The systems we use consists of a OUTBACK Power system: FLEXmax 80 charge controller, VFX 3024j (24 to 100v 50Hz) Inverter, MATE2 and MATE3 and a FLEXnet DC hub with 16 battery/92 Ahr battery bank @ 24v. 4 of our systems were purchased in 2010 and 1 system was purchased in 2016 (hence the MATE2 and MATE3). I just completed the OutBack certification on June 6-9 of 2017. this does by no means makes me an expert I am still new to solar. if you have questions about the training please feel free to ask, in my opinion it is well worth the $499.00 in my case it verified much of what I thought I knew and made me much more comfortable diving into our systems.

Re: what should the peak amperage be

Postby Daak on Thu Oct 12, 2017 3:47 pm

Batteries are as follows:

Deka 8A27 (8A27M) Specifications:
Nominal Voltage: 12V
Amp Hour Capacity @ 20 hr rate: 92 a/h
Reserve Capacity @ 25 amp discharge rate: 185 mins
BCI Group Size: 27
Marine Cranking Amps @ 32* F: 900 amps
Cold Cranking Amps @ 0* F: 580 amps
Weight: 63 lbs
Length: 12 3/4 in.
Width: 6 3/4 in.
Height: 9 7/8 in.
Terminal Type: dual terminals (autopost and stud)
Daak
Member
 
Posts: 9
Joined: Wed May 31, 2017 7:40 pm
My RE system: I operate 5 off grid cabins in US Navy campground in Japan. The systems we use consists of a OUTBACK Power system: FLEXmax 80 charge controller, VFX 3024j (24 to 100v 50Hz) Inverter, MATE2 and MATE3 and a FLEXnet DC hub with 16 battery/92 Ahr battery bank @ 24v. 4 of our systems were purchased in 2010 and 1 system was purchased in 2016 (hence the MATE2 and MATE3). I just completed the OutBack certification on June 6-9 of 2017. this does by no means makes me an expert I am still new to solar. if you have questions about the training please feel free to ask, in my opinion it is well worth the $499.00 in my case it verified much of what I thought I knew and made me much more comfortable diving into our systems.

Re: what should the peak amperage be

Postby Daak on Thu Oct 12, 2017 4:12 pm

I have one more question I have asked this many time to many people and I continue to get opposing answers and that is can these batteries be equalized?
Daak
Member
 
Posts: 9
Joined: Wed May 31, 2017 7:40 pm
My RE system: I operate 5 off grid cabins in US Navy campground in Japan. The systems we use consists of a OUTBACK Power system: FLEXmax 80 charge controller, VFX 3024j (24 to 100v 50Hz) Inverter, MATE2 and MATE3 and a FLEXnet DC hub with 16 battery/92 Ahr battery bank @ 24v. 4 of our systems were purchased in 2010 and 1 system was purchased in 2016 (hence the MATE2 and MATE3). I just completed the OutBack certification on June 6-9 of 2017. this does by no means makes me an expert I am still new to solar. if you have questions about the training please feel free to ask, in my opinion it is well worth the $499.00 in my case it verified much of what I thought I knew and made me much more comfortable diving into our systems.

Re: what should the peak amperage be

Postby petertearai on Thu Oct 12, 2017 6:41 pm

Agm batteries generally cant be Equalized , In fact over voltage is not good for sealed batteries . How old are they . Maybe they are passed use by date ?
2220 pv. fm80. 4times rolls 450 ah 24 volts. victron battery monitor. outback fxr 2000 watt inverter
petertearai
OutBack Guru
 
Posts: 318
Joined: Fri Aug 06, 2010 4:35 pm
Location: NewZealand North Island
My RE system: 2220 watt pv, fm80, outback fxr 2000 watt inverter. Rolls s600 times 4 24 volt system victron battery moniter. optics RE


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