Fri 7th I connected one panel, via the Steca Controller, to one old battery. Used it as load battery and measure a use of 10Ah total.
Could see from the Steca the Asus 900 uses 1 amp
Sat 8th Since then I have 2 old 50w panels connected via the Steca to one old battery. The other old battery I have topped up with water, which was a bit iffy as it was a sealed battery. The six cells needed about a litre so hardly surprising it/they were almost unrechargeable.
That battery as end of day on the 9th was rated as 52% charged, by the next morning is was 48%
I arose at 4am on the morning of 10th Nov to read the Load Ah and the Steca records 5Ah. It is now nearly 10am and the reading is 6Ah. I suppose I can relay on the fact that the phantom use it consistent. Some 6Ah in 44hour (6000mA divided by 44 = 136mA) some 11 times the specified 'own consumption' of 12.5mA.
It begs the question; What is it measuring?
Clearly it is not measuring the load as I would expect.
Why would it measure it's own consumption?
What happens to the waste power when the current is too much for the battery state? Is it measuring that?
It seems that although it is interesting, having some monitor, these questions make it a inaccurate in terms of power measurement.
I assume the Ah into the battery actually pass through the battery terminals. I say this as the Charge Ah is the same as the Load Ah, although I noticed during charging yesterday they did not keep pace and the Load Ah only caught up over night. I wonder if I disconnect the battery from the Steca will it still show the Load Ah, but then obviously not as it will have no power, but I could try it in the day.???
So is this reading an un-understandable one or is it me that is failing to understand how the Steca works?
If you think this unit is faulty please send me another and I will install it and return the current one if that is the case. Of course as you didn't sell me the unit directly maybe you could authorise Wind and Sun to send me one.
I wonder if you actually test the unit as I do? i.e. without any load for a significant time and if you do could you please sent me your data. Better still could you please send me the data anyway
All the best
The 250w panels are 165cm x 99cm 1.6335m^2 so efficiency at 1000watts per m^2 is 15.3% (250 divided by 1634)
I am a bit put out by the physical size and have thought I probably only needed one not 4 ??
Initially I set up a single panel to charge one of the old batteries via the Steca Controller which showed some 8amp of charge, burning of all voltage above 14.7
Now the panel is connected via a Victron MPPT to one of the new Rolls batteries; with no charge readout but in theory providing a max of 20A to the battery.
For more on charging the rolls
Emails about damage to corners
1.To Wind and Sun
I called today to query the crimping inside each of the corners, image attached; it looks like they have been installed somewhere previously??
Each corner on all four panels have the same damage.
2. To REC
Dear REC people
I recently bought panels from Wind and Sun UK http://www.windandsun.co.uk/products/Solar-PV-Panels/REC-Solar-PV-Panels#6160
Every panel has damaged framing on the inside of each corner. The distributor noted, upon checking their stock, that all the remainder had the same indentations and were keen to confirm they were not second hand and under a full guarantee.
However I am still uncomfortable that such indentations to the frame have occurred and wonder if you would explain how this has occurred.
Please see image attached, as noted each corner of each panel has been crimped as though they have been fitted to some other framework very forcefully.
4th Jan 2015
I have finally heard from REC but not before another concern has arisen. There is a gap between the frame and glass panel, which allows water in which will freeze and expand further widening the gap each instance.
Comment 4 REC's initial response and my reply.
Comment 5 REC's brain-dead response and my reply.