# Comments on Welcome to PVCDROM

### fine

very good page,but i would like to can see in PDF

### PDF

Hello,

I think the tree-like nature of most websites precludes traditional 'book' format. That may be why the data is no longer available in textbook form. Further, a pdf would not include dynamic illustrations (text boxes, knobs and dial controls) or animations. If necessary, the site could be downloaded, but why bother? Everything is becoming more dependent on web access, or 'cloud' services.

### Capacity of battery

Thank you for your excellent concise explanation of units wh, kwh, and Ah. Did you perhaps confuse the example of approximate conversion? Was the example ofr 500 Ah or 100 Ah?

### Translation to Indonesian

Good Day, My name is Hugo Erawan and if possible I would like to contribute to this website by adding an Indonesian translation.
This website (the English version) was a great help when I was doing my graduate studies on solar cell and I think it would be great if more people can get access to it. I am a native Indonesian speaker and am familiar with the field of solar cell, so I would like to add an Indonesian translation to add to the multiple languages it is already in.
Please do contact me if this is possible. Thank you for your attention.

### Diodes and solar cells

It would be very helpful to explain a little bit more the section 7.2 under bypass diodes. I do not really understand how is chosen the maximum nr. of cells, that can be connected to one bypass diode? Is it correct to calculate this with the following equation?

nmax< ((Vc - Vf)/ V0c_u )+1

nmax – maximum nr. of cells per diode

VC – breakdown voltage of the cell (~12V for poly, up to 30V for mono)

VF – forward voltage of the diode ( ~0,5V)

VOC_U – open circuit voltage of the cell

### Error on Page Arbitrary Orientation and Tilt?

Hello,

I get currently no results (using Firefox, Chrome and Edge) at https://www.pveducation.org/pvcdrom/properties-of-sunlight/arbitrary-orientation-and-tilt for S_incident and S_module for any input data, presumably because of the NaN results shown for Sun's zenith and elevation ...
Last year I think everything still worked.

At https://www.pveducation.org/pvcdrom/properties-of-sunlight/suns-position-to-high-accuracy also only NaN results are calculated, so here is presumably a bug ...

Thank you very much for the exceptional site.

P.S. I could not open new comment at https://www.pveducation.org/pvcdrom/properties-of-sunlight/arbitrary-orientation-and-tilt, so I placed comment here a little bit out of topic ...

Best regards,
Christian Toebermann

.

### renewable energy

I'm interested in renewable energy in general including efficient harnessing, storage and transmission/distribution

### Assist

Your site is very useful for my company . I want to cooperation with you. Could you please send me an email or something that we can keep in touch with?

Best regard,
A.Moalla

### Assist

Your site is very useful for my company . I want to cooperation with you. Could you please send me an email or something that we can keep in touch with?

Best regard,
A.Moalla

### Batteries with solid lead plates

A chap in Greece has powered his entire house from renewable sources (PV and wind) and has built his own batteries which use large solid lead plates instead of grids filled with paste. He claims that these, although very bulky and heavy, have a life expectancy of 50 years. Are you familiar with such an alternative construction of pole material? If solid lead can be used, would drilling holes increase capacity due to increased surface? I have not found a site with references to solid lead but the idea is interesting, as long as size and weight are not limiting factors.

### Arbitrary Orientation and Tilt calculator appears to be broken

This calculator used to work. But for some time now an Nan err is shown in both the Zenith and Elevation display boxes.

https://www.pveducation.org/pvcdrom/properties-of-sunlight/arbitrary-orientation-and-tilt

Tofael