Full Member level 6
Found a solar panel of 30W to charge 12V battery but I can't find data about what power it gives on a cloudy day in winter. Do you have an answer based on experience?
Thank you BradtheRad, 50% sounds encouraging.Typical PV panel ratings are for a bright sun high in the sky.
Clouds reduce output. Output is also reduced because the winter sun is lower in the sky.
This results in wide variation of output. 50 percent is a reasonable estimate. Therefore it could be a good idea to use twice as many PV panels in winter.
sunlight is important for the panels, besides that if the weather is cool (temperature is low) voltage and power capacity will increase. A sunny winter day is the best for panels. (Maybe it is connected to distance between Sun and Earth also)Found a solar panel of 30W to charge 12V battery but I can't find data about what power it gives on a cloudy day in winter. Do you have an answer based on experience?
Hi Brian.True, the light output is lower when the Sun is nearer the horizon but only because of atmospheric losses. Angling the panel so the light still falls directly on it will give almost the same output. Note that 'winter' can mean different things depending on your geographic location. PV panels at the equator for example see equal N and S tilt at extremes.
Cloud cover obviously reduces the available light, the specifications are for maximum light before the panel 'saturates' but how much it reduces under cloud cover depends on the cloud density.