Questions tagged [solar-power]

Electric energy produced from sunlight. This could be via semiconductors, in [photovoltaics]; or through the concentration of solar heat to drive a turbine, as in concentrating solar power [solar-thermal].

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Power company consistently reports higher consumption than solar PV system

My power company has very consistently reported 45kWh ± 5% per month higher consumption than my grid-tied Enphase system data over the first 6 months of my installation. Why would that be? Is my power ...
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43 views

Under what circumstances are concentrated solar power plants more feasible than conventional solar panels?

Tell me about concentrated solar power plants. Under what circumstances are they more feasible than conventional solar panels? It seems to me, a layman, that there are way too many energy transfers ...
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Do solar panels generate more electricity in hot or cold climate?

Do solar panels generate more electricity in hot or cold climate? Who is right (sorry for the messiness, I currently don't know how to take a long screenshot)?
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39 views

Solar panels - series vs parallel and microinverters

Problem: I have six 100 W panels wired in series on the roof of my van. I can only get 180 W maximum out of my entire setup (with a Canadian winter, I'm expecting at least 300 W), and I think the ...
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55 views

What is the most economical and convenient house battery type?

I suppose a 5kWh storage would be more than enough for a minimalist house with solar energy system. Lithium-Ion electric car batteries would do the job, but they are too expensive and I am not sure ...
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54 views

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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2answers
74 views

Cost-effective way to solar charge proprietary LiPo tool packs having AC chargers

I'd like to go solar with a couple of our battery-powered tools without a) charging the batteries with DC directly, as they're expensive batteries with their own fancy AC chargers, or b) spending ...
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75 views

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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69 views

What is the frequency of fires at solar power generation facilities?

https://pv-magazine-usa.com/2019/08/22/there-are-solar-power-fires-per-year/ This data implies (roughly) 1 in a million solar fire risk. So say I have a 1gw solar farm with 1kw panels. Does this mean ...
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134 views

Renewables vs Fossil Fuel Cost Comparisons, without Subsidies

They said that Solar and Wind are now cheaper than fossil fuels. One of the primary reasons is subsidies and new technologies. Does anyone know the comparison research using No Subsidies. If we ...
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54 views

When does wind make more sense than solar for a home application?

Let's say I have a fixed amount of money that I can either spend on a complete solar PV system (panels, inverter, all the hardware and wiring) or a complete wind system (turbine, inverter, all the ...
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91 views

What type of solar panels to use for a house of 50 m2 and 3000 kW of consumption?

I am beginning to acquire knowledge to assemble my first self-consumption solar kit and I have been investigating what kind of solar panels I should use for a house of approximately 50 m2 with a ...
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499 views

What is the fair-market value of the Solar System installed by Solar City in 2013?

I live in the Maryland suburbs of Washington DC. On December 31, 2012, I signed a lease deal with SolarCity (now Tesla) to install solar panels on the roof of my home + associated electrical ...
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95 views

Grid tied inverters that work during power outages

Is it possible to have a grid tied solar installation operate when power is out without a battery bank? All of the grid tied inverters I have found kick offline during power outages. This is a fine ...
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2answers
154 views

Why should I buy the brand solar panels when the cheaper ones offer a better power to price ratio?

Following this question, I'm trying to figure out what is the best option for me. Looking at brand products, for example SunPower Maxeon 3 400/410 Wp and SunPower P3 Black 325 Wp, they offer a power ...
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83 views

Are optic fibre based daylighting solutions sufficient for solar panels?

Some daylighting solutions are available in the market that use collectors and large diameter optic fibre cables to transfer sunlight to interiors of residential or underground dwellings. Below are ...
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148 views

Any way for microinverter PV array to power a house when the grid is down?

Suppose I'm already heavily invested in microinverter type solar panels -- with the inverter on the panel on the roof. These comply with UL 1741 and will stop supplying power the moment they see grid ...
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138 views

Excess solar power

I am wanting to hook up a solar system to my house but don't want to feed back into the grid (for a number of reasons, including legislative bureaucracy and having to change my electricity company). ...
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73 views

Simple solar light system

I've been looking for a simple solar powered lighting system for a carport I just built. I bought these without realizing how small they are: 2 Pack Solar Lights Outdoor. Unfortunately they look ...
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84 views

Callibrate a battery monitor for a ~5yr old 360Ah solar panel installation

I am looking to calibrate a new battery monitor for an off-grid battery bank that's ~5 years old, since the previous battery monitor stopped working recently. I'm not sure how to go about it given the ...
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1answer
78 views

What do the voltage and energy readings on this MPPT charger mean?

I've got a new EPEver 3210AN, 30 A MPPT solar charge controller, and single 320 W 40 V solar panel connected about 4 feet (1 meter) away with 12 AWG wire. It's a very simple van setup. My battery is ...
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93 views

How do solar panels degrade after 25 years of warranty?

This question is focused on high quality solar panels (certified Tier 1) which are more and more mainstream. The 25 years warranty is becoming standard, and producers describe degradation in 25 years ...
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98 views

Is using multiple MPPT controllers with a solar panels array, to mitigate effect of shadows a myth?

So my installation is for a sail boat. There's a lot things like rigging sails etc, that can create shadows on part of the array and this is constantly moving around. Some panels in the array will ...
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47 views

What's the current price of power to gas fuel?

I've been curious about power to gas technology. I've read up on the immense energy losses as you split water to hydrogen and then using the Sabatier reaction to generate methane. Do we know given the ...
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1answer
51 views

How to identify the rating of my electrical panel

Recently I got a bid from a solar company and they said I don't need to upgrade my electrical box since it is rated at 125 amps, and for that value, I can install a 7k system based on calculation here....
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44 views

Shading percentage to cause hot spots

I'm designing a solar plant over the roof or a huge building for my company. Now the roof has a lot of obstacles, Shafts, pillars, AC equipment etc. I have a couple of questions that I could really ...
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51 views

Renewable garden watering system - 12v battery system (solar recharged) to ensure there is 50l of water at 20ft twice a week

I have a load of water butt rainwater storage linked to my gutter downpipes for my garden water needs, but I can't stand around waiting to fill watering cans from taps on butts, so occasionally (once ...
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178 views

What is the most sustainable choice for a domestic hot water system in temperate, coastal Australia?

We currently have an ailing 14 yr old solar hot water installation. A few plumbers have given us the same story: due to the age and general condition of the system, it makes more sense to replace it ...
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Designing an electrical off grid system for winter

I'm currently planning the conversion of a panel van into an RV including heating, water, and electrical. The part which I'm not confident about is the reliable supply of electrical power in the ...
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71 views

My solar inverter display volts but no amps and a few watts. What's wrong?

I have 150watts 7 solar panels of specs : max DC volts 20; max SC amps 8.02Amps. Individually checked all 7 solar panels short circuit amps and they are in 6.54 - 7.84amps range. Solar Inverter Specs ...
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78 views

Any electric vehicle that can be used as a home energy storage?

I have a house with a solar array on top currently tied to the grid. I would love to be able to use an EV as a battery for my house, and after it charges up in the day be nice to use it for the ...
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35 views

How much renewable energy is curtailed around the world?

CAISO, the California electric grid operator, provides daily and historical reports on wind and solar curtailment: I started looking for similar data from MISO, the grid operator where I live, ...
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100 views

Will negative power pricing counteract the growth in solar PV capacity?

In California, the real-time electricity prices routinely go negative. Here's pricing for the four load aggregation points for California on April 1, 2020 (source): This is due to the large amount of ...
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1answer
94 views

Can I use 2.5kW solar panels to power 2kW rated grid tie solar inverter?

Can I use 2.5kW solar panels (10x 250 watts) to power 2kW rated grid tie solar inverter? Will anything blow up? Panels: 10x 250W, 36V panels Inverter: 2kW with max input voltage: 500V any help is ...
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Solar Panel Drawing Amps instead of adding them? [closed]

I have an off grid powered house powered by 6 x 12v batteries all hooked up in parallel. I also have 4 x 150w 12v solar panels all hooked up in parallel too. Things were good however I decided to move ...
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68 views

How do German fossil fuel subsidies compare to PV subsidies?

Over on Politics.SE there's an interesting discussion about "grid parity": "If grid parity has already been reached, why is it so expensive to switch to renewable energy?". The discussion has ...
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Why am I offered a 5 kW inverter with a 6.6 kW solar installation?

I've just received two quotes for installing a rooftop solar system at my residential address (near Sydney, Australia). This caught my eye: Company 1: Panel: 22 x ET panels 300w Inverter: Growatt 5 ...
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1answer
144 views

Can residential rooftop solar arrays be cheaply extended over time?

I am looking to install rooftop solar on my house some time this year. I have a decent amount of roof space and very little shading so I should achieve fairly ideal conditions for it. A lot of the ...
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754 views

Is it ok to mix battery brands in a solar battery bank?

I plan on installing 12V 100 Ah LiFePO4 batteries, but since they are so expensive, I might buy from different vendors. The batteries have the same chemistry, voltage, and amperage, but are from ...
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Data source for real world solar PV production?

In the U.S., the National Renewable Energy Lab (NREL) provides some great resources for examining the potential of solar PV systems, such as PVWatts and the National Solar Radiation Database viewer. ...
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Solar setup for well pump [closed]

The electricity where I live is pretty expensive at about almost 30 cents a KWh, so I'm considering setting up a solar system. I got 3 100 Watt Polycrystalline solar panels a while ago, pretty cheap. ...
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1answer
91 views

Can data from wind and solar farms be used to improve climate modeling?

As of 2018, there were over 341,000 wind turbines around the world. In the U.S. alone, a projected one million homes will have roof-top solar PV by 2020. This does not include commercial or utility ...
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Must I install bypass diodes across my solar panels? [closed]

I have an array consisting of ten solar panels wired in series as shown in the figure below: My problem is that during some winter months (Oct - Dec maybe), in the afternoon, the sun is so low that ...
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1answer
86 views

Are solar powered cars sustainable and are they a good idea for future transportation?

As population rises, fossil fuels will start depleting so are solar powered cars a good idea? How much power can they produce when it is cloudy?
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117 views

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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3answers
621 views

Pros and cons of solar panels over a parking lot?

What are the net benefits to clearing a plot of trees, or grass to install solar panels? Isn’t it better to install the panels over parking lots?
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66 views

Do light fixtures with small solar panels require direct sunlight?

I purchased an Osram Ledvance DoorLED Solar product which charges its own batteries and turns on automatically at nighttime to provide light. It requires a 7 hour minimum charge time. When there is ...
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42 views

Solar Install Flat Roof

I want to install 23 305w panels on my roof. It's a flat roof constructed with 2x8 beams spaced at 24". There is no snow load to consider and we get occasional wind and rain storms a few times per ...
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127 views

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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732 views

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 ...