Thought we should get a little numbers game going, truth only please. There may be a reason or theory as to what system gets more than most, every day is a school day. What we learn we pass on.
How many watts or amps are you getting from your panels?
So to start the ball, the best I have seen is 722w from my 900w of panels. Lets call that 80%
Reading is from a BMV Victron, dual MPPT "tracer" regulators. Sunny, cool Victorian day. 12v panels (6 x 150) in dual series wiring.
Hmmm Shonky, not sure I understand the question.....
Merely trying to figure the maximum our solar panels are putting out compared with what they are "supposed" to put out.
So in real life, how many watts compared to the chinese watts in a frozen, brightly lit laboratory.
Your battery would have to be down a bit for the controller to give it maximum charge input -is that what you mean?
So "BULK" on most regulators, not floating or similar as that will throttle back the available power.
Never taken any real notice of how many watts goes into my house system, just watch the pack voltages and amp usage. In the bus when it had 460w, the best I got was 435w and that was on an overcast but very bright day.
Have seen over 70A, but generally see closer to 60A from 1100W of 12v panels.
I have found that this irradiation site gives a good expectation of what you can expect. http://www.efficientenergysaving.co.uk/ ... lator.html
Watts is volts x amps, so the voltage at the battery x the amps coming in will give you the watts the system is delivering. Divide this figure by the advertised solar capacity will give you the real efficiency of your system....... be prepared for some bitter disappointment, you don't get what you thought you bought the numbers on the solar panel have very little relevance to real life.
The best I've seen from the 1900w semi flexible panel set up through 4 x 100 amp SSR controller by a Dingo 20/20N has been 125 amps @ 13.6v so 1700w /1900w = 89.4% efficiency. Didn't get a photo of that one but did get a photo the next day of 121 amps @ 13.8v so only 1680w but these measurements are through the Victron 700BMV so only the excess going to the battery, not the total harvest as some items would have been powered directly from the solar, such as inverter standby, control equipment, but close enough. Hard to argue with a photo eh
Solar output 1.jpg
Solar output 2.jpg
T1 Terry
You do not have the required permissions to view the files attached to this post.
A person may fail many times, they only become a failure when they blame someone else John Burrows
Those who struggle to become a leader, rarely know a clear direction forward for anyone but themselves
Might be a while before it hits main stream, but check this out http://www.altadevices.com/technology/ 31% efficiency as far as I understand it means 310watts from every sq mtr of solar cells. This means the roof area of an 11mtr motorhome could harvest 34kWh of electricity each full sun day by using the 5 hrs peak sun per day formula, that is around twice the power used by the average home per day in Australia.
Considering the first commercial cells were 2% efficient back in 1955 at a cost of US$1785/watt we have come a long way at around $1/watt being seen quite often these days. Where will the sq mtr efficiency/$$ per watt be in another 5 yrs? I wonder what the required efficiency would be to actually generate useable energy during a full moon?
T1 Terry
A person may fail many times, they only become a failure when they blame someone else John Burrows
Those who struggle to become a leader, rarely know a clear direction forward for anyone but themselves
interesting figures so far...
According to my disputable maths, there is a fair difference, I wonder why??
Jon, Dapope and myself all pretty close to 80% output compared to advertised BUT
Native Pep and Peter (& Sandra) are both on 94% with T1 cutting the middle at 90%
the numbers on the solar panel have very little relevance to real life.