Why does not my 100W Solar Panel fail to charge my two small 12 40Ah solar batteries?

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Re: Why is my 100W solar panel failing to charge my two small 12 volt 40Ah solar batteries?




by Christophe » 19/12/17, 02:23

izentrop wrote:No, it is linear and not very important as the curve shows.


from 155 to less than 130 it's not nothing anyway ... Especially since in Africa with the dodger it must exceed 80 ° C so around 110 W ...

In fact the nominal power of a photovoltaic panel is given at how many ° C? I can not remember...
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Re: Why is my 100W solar panel failing to charge my two small 12 volt 40Ah solar batteries?




by Gaston » 19/12/17, 09:53

chatelot16 wrote:there is only the panel which produces energy ... if the panel is too small there is no solution!
Yes.
But there, we have the impression that the battery does not charge at all (mas I did not understand if it was a test without consumers :| )

chatelot16 wrote:cable section: it is only the cable between regulator and battery which is important: if this cable is too long the regulator slows down the charge before the battery is full
too long, or too thin (or with bad connections leading to voltage drops).

chatelot16 wrote:the cable between panel and regulator is much less important: the panel can do a few more volts without significant drop in current
In total, the power produced can still be affected, but that should not prevent charging the battery.

It seems to me that it would be necessary to carry out a test without any consumer, over several days if necessary, to find out if the battery is recharging (I have the impression that not ...).
After 2 or 3 days without consumption, it should exceed 13V (while it turns more between 11,5 and 12 currently, which is rather a sign of an almost empty battery).

And it is absolutely necessary to make intensity measurements (panel, regulator, battery, consumer) and not just voltage.
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Re: Why is my 100W solar panel failing to charge my two small 12 volt 40Ah solar batteries?




by SEIRMIC » 19/12/17, 14:08

good evening everyone
Good evening Izentrop I just made the measurement of the circuit course it gives me 1,46
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Re: Why is my 100W solar panel failing to charge my two small 12 volt 40Ah solar batteries?




by Christophe » 19/12/17, 14:19

1.46 That's not a lot ... but maybe there are protections ???
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Re: Why is my 100W solar panel failing to charge my two small 12 volt 40Ah solar batteries?




by SEIRMIC » 19/12/17, 14:31

Christophe wrote:1.46 That's not a lot ... but maybe there are protections ???

I do not understand. What kinds of protection please? I measured directly on the plus and minus terminals of the vacuum panel. I think my amp is not working anymore because I left it connected and go out to find my device to take the photo and when I arrived it was no longer displayed. But I had memorized the output on the indicated calibration and the procedure given by izentrop above here. That's 1,46A : Oops:
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Re: Why is my 100W solar panel failing to charge my two small 12 volt 40Ah solar batteries?




by izentrop » 19/12/17, 14:49

A 100 W should provide 5 to 8 A in full sun at your latitude. Should be dismantled to check cell by cell.
Maybe a solder to redo ??
A 12 V panel should have approximately 34 cells in series, with approximately 0.5 V per cell.

The only protection that there can be are schottky diodes to avoid burning cells due to partial shade and to avoid reverse current at night. He should have at least one.
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Re: Why is my 100W solar panel failing to charge my two small 12 volt 40Ah solar batteries?




by SEIRMIC » 19/12/17, 18:55

izentrop wrote:A 100 W should provide 5 to 8 A in full sun at your latitude. Should be dismantled to check cell by cell.
Maybe a solder to redo ??
A 12 V panel should have approximately 34 cells in series, with approximately 0.5 V per cell.

The only protection that there can be are schottky diodes to avoid burning cells due to partial shade and to avoid reverse current at night. He should have at least one.
Image



Attached are the photos of the Panel in midday Izentrop sorry how then count the number of cells
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Re: Why is my 100W solar panel failing to charge my two small 12 volt 40Ah solar batteries?




by SEIRMIC » 19/12/17, 19:18

Mr. Izentrop sorry can I know how to count cells through my panel?
I dismantled it this evening and I did the cleaning then I took advantage to open so that you see the diodes and the references of the panel.
I see welds on the panel, you could zoom in on the photo of the panel, I think you will see what I am talking about. In welding (possibility of welding) I do not know anything about the subject unfortunately.

Thank you very much.
Eric
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Re: Why is my 100W solar panel failing to charge my two small 12 volt 40Ah solar batteries?




by SEIRMIC » 19/12/17, 19:29

I searched a little, but in my panel I would not know how to count the cells see how they appear on this photo by contribution to my panel, where I do not know where to start counting.
Could you help me count them on my sign please?
Very cordially
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Re: Why is my 100W solar panel failing to charge my two small 12 volt 40Ah solar batteries?




by chatelot16 » 19/12/17, 20:55

your photos dismiss my first concern: there is no shade, unless you hide from us a large building just next to the sign

count cells ... easy for large panels which have square cells ... but 100w is a small panel which has small cells made with large ones cut into pieces, so rectangular cells not easy to identify on the photo ... but whatever, your label shows that its optimum voltage is 18v, so it can be used to charge a 12v battery

what worries me a lot more about your photos is these traces like large cracks on many cells

and I always come back to the same thing: MEASURE THE CURRENT! there is only the measurement of the current which will allow to advance, to know if your panel works or does not work
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