# What is Solar: Definition and 1000 Discussions

25. ### I Minimum light bulb wattage for solar simulator

I am trying to design a simple homemade PV solar simulator. I have picked metal-halide lamps as my light source. If the PV panel has an area of 1m^2 and I wanted to achieve spatial uniformity across the irradiated surface with an irradiance of 1000 W/m^2, how do I go about selecting what...
26. ### Calculations using the Standard Solar Model & Solar Equations of State

Assuming the Sun’s core has a mass of 0.35 Msolar_mass and taking values for other quantities from a internet background search or from the following figures (i.e.: Radius "solar core" = 0.25 Rsolar_radius ): ------------------------------------------------------------------------...
27. ### B Ivuna meteorite from edge of solar system to Tanzania?

Scientists find the source of one of the rarest meteorites to fall on Earth https://www.msn.com/en-us/news/technology/scientists-find-the-source-of-one-of-the-rarest-meteorites-to-fall-on-earth/ar-AA13ejQe Terrestrial modification of the Ivuna meteorite and a reassessment of the chemical...
28. ### Calculating total heat transfer by solar water heater

I have a solar water heater on my deck, with a circulator powered by PV, that pumps heated glycol through a wand heat exchanger placed in an 80 gallon tank. Water comes from the well's pressure tank, passes through this solar pre-heater tank, then into an LPG heater that adds any heat needed. I...
29. ### Solar panels, Carrington Event

Has any research been done to determine the effect a Carrington Event (or close) solar flare would affect solar panels?
30. ### Could we make a practical solar fridge?

In another thread, @Grinkle asked about a solar fridge project. In the end, he decided against it, but it set me to wondering if it could be done for people living off grid. At this point, I really miss our beloved Jim Hardy. Jim would have brainstormed with me, then he might have gone in...
31. ### Electronics Rule of thumb for derating Solar Energy off-grid energy systems

I am working on a sanity check for capacity vs load and if anyone here has experience with off-grid solar, any feedback would be much appreciated. The application is to run a fridge and a modem off-grid on a piece of land in New Mexico. I read that in December (worst case month) the area gets...
32. ### I Interpreting solar event flux units

Hi, I wanted to find the number of protons striking a surface area during a solar event and the units provided are: #/(cm^2 s sr). Say I have a 1 m^2 surface area directly facing the sun, how do I use those units to discover the number of protons/s. What is the value of the solid angle to...
33. ### Maximum duration of Solar eclipses

The result I get is 2 hours and 10 minutes. My reasoning is down here. But! Checking the map for the 2024 Solar eclipse, https://www.timeanddate.com/eclipse/map/2024-april-8, in many locations you can see a partial eclipse of over 2 hours 40 minutes. What is the main source of error here? Here...
34. ### Perovskite semiconductors for solar photovoltaic cells

I heard this while driving the other day. Progress On Perovskite Solar Cells | Earth Wise with Randy Simon https://earthwiseradio.org/podcast/progress-on-perovskite-solar-cells/ I wanted to check this out. Si melts at about 2,570°F (1,410°C). I'm not sure about 3000°F (1649°C), which...
35. ### Self-adjusting orbiting solar shield

It is widely accepted that global warming caused by accumulating greenhouse gases is happening and, as the late Isaac Asimov pointed out years ago, even if or when this is curbed, if the population remains at similar levels as now then just the waste heat from human activities will eventually be...
36. ### Building a Solar System simulation with python

Hey'all. First of all, I'm not fluent in English, so forgive me for the spelling mistakes. So, I'm trying to make a simulation of a solar system using python 3.9. It's not complicated, but my teacher wants me to do it using the Basic Verlet method, and that's what is bugging me. He told me do do...
37. ### Photovoltaic vs. thermal radiator Solar Panel comparison (using a lens)

Hi, Has anyone experience with photovoltaic solar panels and thermal radiator type solar panels? 1/ How do they compare when both have the same collection area? If the thermal radiator was much smaller than the collection area, and a lens the size of the collection area was used, focused on...
38. ### A solar powered air conditioner

1. In this system the sun boils Freon in a solar panel. 2. Freon vapor is sent to a turbine or piston motor. 3. Freon discharge from the motor is sent to condenser coils submerged underwater. 4. The cooled, low-pressure Freon is sent back to the solar panel inlet. 5. The Freon-powered motor...
39. ### I Does Space Curvature Account for Gravity Between Individual Atoms?

I am trying to come to terms with the two concepts of gravity, direct attraction between bodies (say dust even) and attribution to the curvature of space (time) Looking at a physical sea coast I can envisage how every instance of the mass gravitational interactions of individual atoms or smaller...
40. ### Solar Sails -- What are the current limitations?

What are the current limitations with solar sails and why are they not used with greater frequency? I have heard of hydrogen blistering -- is that a significant issue?
41. ### Could you use Solar to power a DC to AC Inverter? (Description below)

I'd like to take Solar Panel power output and use it to power an AC outlet on the ultra-cheap. I know a lot of people use Solar to connect to a purpose built inverter and also have a battery somewhere in the mix to provide a stable output but wondering if the following (using the assumptions...
42. ### Could cymatics keep Martian dust off solar panels?

Hello. I went to my local astronomy club last night and the subject of diminished solar power caused by dust came up in conversation. We looked at images of the Insight mission and these showed a significant build up of said dust. This got me thinking. Could the solar panels of future Mars...
43. ### Escape velocity of solar system

I'm pretty confused by this but I have a few thoughts. Since the sun takes up most of the mass of the solar system, I was thinking maybe I'm really looking for the escape velocity of the sun? So I would use the mass of the sun for M and the radius of the sun for r. My other thought was to add up...
44. ### Engineering What is difference between solar radiation and global radiation?

Solar radiation-: it is em radiation emitted by son. it is short wave radiation. it comes in many forms. 1) visible light 2) radio waves 3) infrared 4) x rays 5) uv rays Global radiation-: it is sum of direct and diffuse radiation arriving at a ground. What are the differences between these two?
45. ### Isolate solar charger PWM pulses

After we got the solar array working, we made all lamps, laptop chargers, most kitchen appliances... run on 48vDC (so that we can have the inverter switched off unless we're running any 220v appliances). Then everyone in the house got a headache. We traced this down to being indoors at daytime...
46. ### I Pool Solar Heating - Help orienting the roof-top solar collector please

Hello there, Physics forum. I live in Alamo, California and I'm planning to install pool solar. All of the installers have completely different POVs on which face of the roof I should put them, and hoping to get some physics-based advice. Here's the home with the 3 face options (front already...
47. ### B An Ancient Solar Storm 9200 years ago is Cause for Concern

https://www.livescience.com/ancient-solar-storm-solar-minimum
48. ### Tension at a SPD for Solar Power System

Hello there! I am using a Surge Protection Device (SPD) for Solar Power System. My home uses a 3-phase system (380V and 220V at each phase). What should be the tension between the phase and ground at the SPD? And between the ground and neutral? Should be any tension at all? God bless all. PS. My...
49. B

### Why Are Solar Panels 21-22% efficient? How can efficiency improved?

How efficient are solar panels? How can their efficiency improve? Besides their benefits, what are the ecological impacts of solar energy?
50. ### I The centripetal acceleration of the planets in our solar system

Relevant formulae:- Angular velocity in uniform circular motion ##=## ##\omega## ##=## ##\frac {2\pi} t##, where ##t## is the time taken to complete one revolution. Centripetal acceleration in uniform circular motion ##=## ##a## ##=## ##\omega^2r##, where ##r## is the radius of the circular...