Questions tagged [photovoltaics]
Solar panels that convert light directly to electricity. For questions on using sunlight to to heat water use [solar-thermal]
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Why is it easier to retrofit an AC-coupled than a DC-coupled battery to an existing domestic PV installation?
Not wishing ever to charge a (prospective) house-battery from the grid, naively, I think of a DC-coupled battery as a sort of capacitance between existing solar panels and their inverter.
Again, ...
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Why does my max power produced differ depending on the resistance of the test load?
I have a pair of solar panels mounted on my roof. They are rated 90W each, but I want to know, given my latitude and installation, what amount of power they are actually able to generate. I have a ...
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Is washing solar panels useful/needed/mandatory?
Washing solar panels is sometimes recommended by some third party companies but it involves monetary and environmental costs.
Is it beneficial? I compared the ratio production over insolation the week ...
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Technical details The Rockefeller Foundation provides to justify a projected 15 cents/kWh for rural solar mini- and micro-grid solutions at scale?
In CNN's April 25, 2022 Hear bold new idea to bring clean energy to billions journalist Fareed Zakaria interviews Dr. Rajiv Shah, the President of The Rockefeller Foundation. Here is a bit of the ...
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Can a solar inverter still work without batteries? (off-grid)
Consider the following setup:
Solar panel (0.5 m2 / 12V / 100W)
Solar inverter (12 volts DC → 120 volts AC)
LED TV (32" / 55 watts)
no batteries / no grid-tie
Assume the solar panel is ...
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Do solar PV roofs make sense for semi trucks?
Today I read the news that Tesla is about to start production of electric semi trucks (aka tractor-trailers). Given the size of the trailer and its long, flat roof, I wonder if it would be feasible to ...
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DIY portable solar panel mount
So I just bought one of the 28W Big Blue portable solar panels on Amazon and got myself a cheap camera tripod from a local garage sale, all for an upcoming camping trip. I want to use the tripod to ...
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How to work around a supposed Huawei SUN2000L-5KTL inverter throttling issue
I have a PV system with a WEG SIW300H M050 inverter, which is simply a rebadged Huawei SUN2000L-5KTL (link to the manual). Its rated output power is 5000 W while its nominal apparent power is 5500 VA. ...
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PV system: Which to upgrade first: panels, inverter, batteries?
General question
Adding on from the title, what are the restrictions to ensure that the various components of the PV system are compatible with each other? Are there rules around how many batteries, ...
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If water gets on solar panel connector from cleaning or rain will it cause problems?
I have a solar array with 8 panels. There is a slight gap between each panel. At 2 locations string MC4 connectors are placed between the gaps.
My question is if water gets on this connector (and not ...
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What is the energy payback time of portable solar panels, in hours?
I'm interested in knowing the typical energy pay-back time of a solar photovoltaic panel, in terms of hours operating under an ideal scenario.
Energy pay-back time (EPBT) is usually quoted in terms ...
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What is the typical embodied energy of a solar photovoltaic panel?
What is the typical embodied energy of a solar photovoltaic panel, in terms of nominal power output or panel area? The ideal answer would be in kWh/WP, but kWh/m2 would also be acceptable.
I ...
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Which measure of solar irradiance is needed to calculate the energy output of PV systems?
According to "E = A * r * H * PR" global formula to estimate energy generated, the solar irradiance value is needed. I have Horizontal irradiance, Tilted irradiance, and Normal irradiance values but ...
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Solar charging an e-bike's lithium battery while riding
I would like to know what parts I would need to charge a 36V lithium battery for an ebike? I want to charge the battery while riding the bike for greater range.
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Are green roofs more sustainable than roofs with photo voltaic?
Both types of roofs have advantages. Green roofs do not produce energy (in some cases just fruits) but they do not consume that much energy for production of panels, installation and control and do ...
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How to consume all my photovoltaic electricity locally?
In a location where feed-in to the grid is not rewarded, it makes sense to somehow consume all the "oversupply" electricity from photovoltaics by yourself.
How can I implement this in an automated ...
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Low-cost solar energy alternatives to power a single appliance in an apartment?
I'm searching for information on solar energy alternatives that are accessible to people like me without having to break the budget. For example, I live in an apartment with a rooftop, and I want to ...
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Apply solar energy solutions at our apartment?
I know this will probably get closed, but it seems that I can't find anything that will guide me in the right direction.
We live in a South American country, so we have tons on sun. We also have a ...
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How much irradiation from the sun is required to generate solar power?
Interested to know how to calculate how much energy photovoltaic (PV) panels would produce given x amount of solar irradiation per day - amount of direct sunlight and how much that might be effected ...
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Feeding hotwater into modern appliances
Most appliances, such as washing machines and dishwashers typically take cold water and heat it internally. This is probably the most efficient way on a grid connected house with electric water ...
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Can I connect an inverter directly after an MPPT controller, with no battery?
Is it possible to connect a 12VDC to 220VAC inverter to the output of an MPPT solar charge controller, with no battery? This will be cheaper than having a full solar inverter, which can be really ...
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What exactly is Potential Induced Degradation in PV panels?
Can someone explain Potential Induced Degradation? I've been looking over the internet but a lot of the explanations go into too much detail.
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Converting from W/m² to kWh/m²/day
I have access to live solar irradiance data (in W/m²) at each minute of the day in my location, they come in 3 types: minimum, maximum and average. How do I make use of these datas to convert to kWh/m²...
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Solar Panel short section of string due to obstacle
Recently I have installed a set of 10 panels connected in series with 1 single Inverter. I have realised that for the first 2 hours 2 PVs have a cast shadow on them from a neighbourhood tank (that ...
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Photo voltaic panels string of 3 kW setup
Am considering installing 3 kVA pv system on my roof top. I am to use a string system on a single inverter.
My choice is :
12 by 250 W =3000 W or
10 by 300 W =3000 W
Space is not an issue.
...
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Transmit solar over multiple time-zones?
I heard that at big voltages (10 000+V) the energy loss along a wire is very small. Unfortunately I've got little electrical knowledge, but this sparked up a question:
Considering that peak ...
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How much energy costs do portable solar panels save in a house?
Our Houston area HOA does not allow roof top solar panels and I doubt they would survive our hurricanes too. I discovered NRG Energy sells these portable solar panels under their goal zero brand.
If ...
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Solar PV panels - Worth the cost of more efficient panels?
We're investigating fitting solar PV to our large guesthouse in the UK. We can fit around a dozen panels on the south-facing roof (sadly this is one of the smaller roofs). Some installers are ...
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Can solar energy be too focused onto a solar cell?
I want to focus solar energy on a solar cell with the use of mirrors (that I already have) and maybe some aluminum foil.
Should I not go overboard on the focusing? How can I detect if the focused ...
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What scope is there for price reductions in photovoltaic inverter costs?
In almost all of the world (except the USA, which has specific local cost challenges), system photovoltaic (PV) costs have come down a lot, to about €2 per installed watt. A large part of the ...
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What causes photovoltaic (solar) cells to degrade?
Photovoltaic panels can have 20 or 25 year underwritten warranties with a guaranteed remaining efficiency of 80 % of the new panel. That means, that photovoltaic panels seem to degrade somehow.
Why ...
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What have been the economic factors behind the build of tracking PV systems?
I see there's now over 1GW of installed PV capacity in tracking systems.
What have been the economic factors behind this? I'd pretty much written off both 1-axis and 2-axis tracking in my mind, ...
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Central or Micro inverter
I want to install some solar panels around 1 kWp. All the suppliers nearby offers me a central inverter solution. Should I look for a micro inverter solution? Or is something that I shouldn't bother?
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How can electricity grids successfully incorporate high (50%+) penetrations of PV and wind?
Although most of the renewable energy currently consumed by the world can be turned on and off at will pretty easily (hydro and biomass), there are two potentially huge supplies, wind and PV, that are ...
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How can I monitor a PV system's performance?
What are things I should monitor to track a photovoltaic system's performance?
I'm not looking for a recommendation for a particular piece of kit, because such a recommendation could quickly go out ...
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Does a building need an equator-facing roof to take advantage of Solar PV systems?
Does a building need an equator-facing roof to take advantage of Solar PV systems? That is, in the Northern hemisphere, do I need a south-facing roof? And, conversely, in the Southern hemisphere, do I ...
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Are tracking mounts cost-effective for home photovoltaic systems?
Solar PV panels are clearly more efficient at converting sunlight to electricity if they are mounted on racks that rotate to track the sun's apparent travel across the sky. However, tracking mounts ...
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How do I keep my solar panels clean?
What sort of cleaning regime should I have for a solar energy system, and do PV and solar-thermal panels need to be treated differently?
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Which solar power technology has the highest energy return on investment (EROI aka EROEI)?
Which solar-electric technology had the highest EROEI?
Energy Returned On (Energy) Invested, also known as EROI and as EROEI, has become something of a fashionable metric *but see footnote.
It is ...
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Photo voltaic windows Pro - Cons. Where to get them?
I intend to build a house in the near future and I want it done in a proper way. From my perspective "proper way" means also as much as self sustainable as possible. Hence I intend to generate/produce ...
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What advantages (any?) has water heating via photovoltaic system over solar thermal system?
Both solar thermal water heating systems and photovoltaic systems already have a good commercial background. Efficiency of energy gain of a solar thermal system is about 80%, while photovoltaics is up ...
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What type of photovoltaic cells are the most environmentally friendly?
Some solar panels use silicon crystals that required careful purification and enormous quantities of energy. Some types use cadmium, which is highly toxic. Several types are noted by Wikipedia.
If we ...
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Estimating the cost of solar panels and return time?
I'm interested in installing a solar array on my property, and am trying to find tools that can help me do a cost analysis so I can optimize my budget and see how long it will take to balance the ...
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Would monocrystalline or polycrystalline solar panels perform best in a UK climate?
If I were to get solar panels installed on the roof of my home, in the UK, what type should I choose? There appear to be three main types, and at present the choice appears to be between the ...
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