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Questions tagged [solar-energy]

Form of renewable energy emitted by the Sun, coming in two flavours: photovoltaic and thermal. The former, especially, relates closely to electrical engineering since it is traditionally harnessed through semiconductor devices and converted to AC in order to feed the electric grid or individual users' homes.

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Managing Solar Power, battery, and load for raspbery pi - designing power management system

So, I am working on a scientific instrument that measures air quality. It uses a raspberry pi with a couple of sensors. Essentially, this instrument is going to be deployed in an Urban area in a ...
Jack's user avatar
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Off Grid Without Battery Inverter [closed]

Respected Members, In My Country Pakistan hundreds of peoples selling off grid inverters that are working without battery. But I am not sure whether it is safe or not? because solar production is not ...
AQIL's user avatar
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Do we need MPPT in grid synchronization and string inverters? [closed]

I have two questions regarding the MPPT grid synchronization. I have seen that it takes a few minutes for the inverter to get synchronized with the grid. I want to ask that does the inverter first ...
kam1212's user avatar
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2 answers
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Charging a battery using solar panels, and IV curve of the solar panel

I am aware that a solar panel has a fixed IV curve, and the load resistance can move the operating point of the solar panel along the IV curve. If a solar panel was used to directly charge a battery ...
siyunlee's user avatar
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2 answers
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Solar emergency LED Night light control design: Solar panel, 5 V : 3.7 V 18650 Li-ion or similar as Vref. No negative voltage. Only GND. Which Op-Amp?

Solar charging daytime with 0 V battery output to micro LED chain. At nightfall, solar voltage drops to 0, activating Vout: 3.7 V or alternative Lithium chemistry to power 30 ft (100×) white LED rope ...
Tikun's user avatar
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Difference between MPPT charger and MPPT boost converter

I am quite confused regarding the MPPT charger and the MPPT boost converter. I have a hybrid inverter where I have a boost converter circuit at the beginning with inputs from the PV. The output of it ...
kam1212's user avatar
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Earth protection in PV + battery system

I'm building a system that looks like this: PV -> solar charger (48 V) -> batteries (48 V) -> isolated DC/DC (48 V->12 V) -> non isolated DC/DC (12 V->3 V) -> load The PV's are on ...
user362085's user avatar
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Solar Array Control With Photocell

We did search on this topic before making this post, but this is as close as we found; Link to question from 2020: Solar Panel-Photocell Wiring ... which didn't seem to be closely enough related to ...
Stephen Falken's user avatar
9 votes
5 answers
3k views

Are 96V lead acid batteries a thing?

In the context of renewable energy grids (eg large-scale PV), I've seen people use 12V, 24V, and 48V batteries. I haven't seen 96V batteries. I'm wondering, as things continue to scale-up to large-...
Michael Altfield's user avatar
2 votes
3 answers
76 views

Charge EV from array of small solar panels DC/AC

Suppose I have 20 solar panels specified to yield 18V, 40-80W. What would be the best (most efficient, non-damaging) way to use this to charge an EV, if possible? Note that it doesn't matter for me ...
jac's user avatar
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Confusion regarding solar power?

I was reading book of gilbert and i came across the following statement One of the most useful ways to describe energy production from a PV array is in terms of kWh/yr delivered per kW of STC rated ...
DSP_CS's user avatar
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Low Solar Panel Voltage Vmp Operation

so I'm currently working on an MPPT project using Asynchronous Buck Converter with the design : Capacitor Input : 470uF/100V Capacitor Output : 1000uF/100V Inductor : 65uH fsw : 39khz current : 30A ...
tabun's user avatar
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Why not always size solar cells and charge/power management module to three times continuous load power?

I am asking this question because it seems to me that this is necessary always, but I don't see people doing it. I see 196A battery to inverter setups with a 40A charger only. To me that seems wrong. ...
Gunther Schadow's user avatar
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2 answers
78 views

Why not always connect cells in series to increase voltage in solar component setups? [closed]

I am designing a solar system which I can take to an Indio village deep into the Amazon forest, and thinking about some principles. I am talking about a 2, 3, or even 6 kW system. I see a big problem ...
Gunther Schadow's user avatar
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28 views

Solar panel charging Li-ion battery with PWM + MOSFET

My idea is to set up a circuit that uses a 18 V, 15 W solar panel to charge three 3.7 V 21700 Li-ion batteries in series (nominal voltage = 11.1 V) while the solar panel is connected directly to the ...
Geona's user avatar
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1 vote
2 answers
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Number of solar panels to power a level-2 EV charger

I am working on a project for my intro to engineering class. We are theoretically designing a EV charging station powered by solar panels. I found an example level-2 charger that says it is 9.2 kW at ...
colhad's user avatar
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2 votes
3 answers
91 views

PC fan, powering directly by small 12V solar panel - adding more panels to help working with less sun

So I have a 12 V solar panel and a fan (size of a PC fan, assume 12 V and 0.15 A) that if connected directly work great in a full sun. Its located in a shady environment and if I kick-start it with my ...
Dmitry's user avatar
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88 views

Troubleshooting Sako Solar Inverter and Osaka Battery Charging Issue

I have a solar power system comprising a Sako inverter (3.5-5.5 kW) and two Osaka P-180 S batteries with 21 plates per cell. Despite receiving input from the solar panels, the inverter does not ...
anwar ali's user avatar
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1 answer
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Where does the electricity in electromagnets come from if permanent magnets from generators decrease their magnetic strength?

The question has been puzzling me for some time, I presume electrical power starts from generators, the heat produced by them(generators) cause their magnets to weaken and electromagnets have to be ...
kopon stanley's user avatar
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1 answer
89 views

Symbol of short circuit (or termination) with an Earth

Can someone explain to me why the symbol of the valve arrester has a short circuit, if it is already earth? I don't understand why it is depicted like this. Why does the valve arrester have the symbol ...
Daniel Prieto López's user avatar
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20 views

Can I use a group switch to bypass a PV inverter?

I have an PV inverter which takes power input from the main grid and the PV modules/battery Depending on availability, the power output to my house will be a mix of these inputs. In a usecase I want ...
arminb's user avatar
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Disadvantages of using triac to control inverter load

I'm trying to optimise the usage of a residential solar system. It's a fairly low capacity system connected to the grid with an inverter (no batteries). There is also resistive heater which uses, on ...
David's user avatar
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Grid tie inverter 200 W with low voltage auto disconnect

I have a grid tie inver that produces at most any day 200 watts from my 12 V battery bank. I also have a adjustable auto low voltage disconnect circuit that disconnect the 12 V from inverter when ...
KF5DMY's user avatar
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2 answers
51 views

Excess PV damage load?

Assume a 200 A service with a 40 A PV and a sub panel with a 20 A breaker. If it is mid-day and if there is excess PV (say 35 A) in the main service panel and light loading the load subpanel, why does ...
boneym's user avatar
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56 views

Repurpose APC UPS with Solar Panel as DC-AC Inverter, what changes needed

Firstly I have these items lying around, 330W 24V Solar Panel, APC Back-UPS Pro 1000VA/600W with dead battery Wanted to see if I can repurpose this UPS circuitry to utilize solar panel during day time ...
ezio16's user avatar
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1 vote
1 answer
90 views

Selecting a charge time for a NiMH charger at 1C

I'm building a solar charger for an Energizer 8.4 V, 175 mAh NiMH battery with a MAX713. The solar panel is 15.4 V, 200 mA. If I charge them at 1C (175 mA), would it be better to set the charge time ...
488 Studios's user avatar
3 votes
3 answers
118 views

Confusion regarding solar cells

I am very confused by these two videos. This video mentions at 1 minute onwards that a solar cell has a PN junction. This video mentions N type solar panels and P type solar panels. From that what I ...
ATJ's user avatar
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2 answers
133 views

Combining/ Balancing multiple small solar panels

I am designing an energy harvesting system that runs off of a couple of solar cells. Each cell is a Dye-sensitised solar cell and gives out around 0.5v. Because of the placement of the cells around ...
raider0ne's user avatar
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1 answer
57 views

Limiting current/power dynamically

I recently installed solar panels and now I was looking at using the energy as efficient as possible. All the energy produced I don't use goes to the grid, I get a small amount of money for that. I ...
YentheO's user avatar
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53 views

Solar system: 40 A DC AND fuses. What is the difference between Audio and Solar version of this fuse?

So, I've purchased some 40A ANL fuses and holders for my solar controllers and I'm hooking them up tonight after the sun goes down. Due to a comment from a neighbor, I went back and reviewed my ...
boatcoder's user avatar
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1 vote
1 answer
120 views

Where to place an LED to indicate the charging of a battery via a solar panel?

See the attached circuit diagram and PCB design. All I'd like to do is have a very small LED turn on when the panel is charging the battery. Circuit description: Q1, a PNP transistor ensures that when ...
Andrew Earl's user avatar
1 vote
2 answers
215 views

Solar Powered Bilge Pump for Pool Heater

I am planning to build a swimming pool heater, using a solar panel to drive a bilge pump which circulates pool water through 1/2" x (2 x 60) m poly irrigation tube to heat swimming pool. Solar ...
Leon's user avatar
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0 answers
63 views

How to calculate or estimate power inverter's peak power

What should be fine to consider as peak power output of an inverter when a motor starts for example? given that: Capacity (Rated Power): 935VA / 12 V Solar UPS Overload:110% Solar UPS Short Circuit ...
USER249's user avatar
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1 vote
1 answer
51 views

Connecting a Pb battery back with a LiPo pack to combine maximum output power

I am working on my mountain cabin and am wiring it with some new electricity. In the long run, I want to switch to only LiPo based batteries but for now I still want to keep my old Pb batteries as a ...
h_uat's user avatar
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1 answer
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Is this possible? 1phase splitphase auto transformer connected to A 3phase grid

Dear reader, I have a question about a single-phase auto transformer which is connected to a three-phase electricity grid. The windings of the auto transformer are on a common iron package. The ...
wogoos's user avatar
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110 views

How to prevent a nichrome wire from melting under variable energy?

I’m experimenting with a DIY “sand battery”. The “battery” is a pot lined inside with an insulator and filled with sand. The sand is heated by a nichrome wire placed at the bottom. The wire is ...
Sophivorus's user avatar
1 vote
1 answer
53 views

Effects of Solar Distributed Generators on Utility Grid

The figure Below is a test block diagram that I would like to model and simulate in DigSILENT PowerFactory Software to analyze the effects of SDGs on the utility grid’s Power losses, Voltage ...
Ronny Alfons's user avatar
0 votes
2 answers
842 views

Why is there loss of power between solar inverter and utility meter?

I have an on-grid 10 kW system installed with two-way recording meter. Recently I have noticed that units generated as shown by inverter are more than the units recorded by utility meter. Previously, ...
Fawad Pasha's user avatar
0 votes
2 answers
732 views

I am trying to DIY outdoor gazebo solar lights

Im no electrical engineer. Just a bored ADHD mum trying to make her home nice and eco friendly. So we just set up a gazebo tent un our courtyard and it gets really dark at night. We dont have any ...
Sophia Castaneda's user avatar
1 vote
1 answer
187 views

Connecting two solar panels in parallel with different voltage - circuit model

I am interested in understanding how two solar panels with different voltages in parallel work. Despite it is not recommended, but it may occur when for example one panel is defected, under shading or ...
Al-Farouq's user avatar
0 votes
1 answer
40 views

How to Install 10kW FSP Hybrid inverter [closed]

I have an FSP 10kW inverter which shows a circuit diagram for a separate input from Grid and an output for the urgent load. My question is what is this output for when I only need the main consumer ...
Smrtngy's user avatar
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0 votes
1 answer
43 views

Different load on series connected solar panels

I have a setup consisting of three solar panels connected in series, which supply power to a variable frequency drive (VFD) that runs a three-phase motor. I am planning to incorporate an MPPT (Maximum ...
Bilal Khan's user avatar
0 votes
0 answers
267 views

Can a single CT Clamp go to 2 energy meters?

I have a Split Core CT CTSA016 - 100A/50mA Yuanxing CT Clamp (Datasheet) around my mains - and it is feeding into my Solar Inverter. I have just purchased a Shelly EM 2 Channel WiFi energy meter to be ...
RenegadeAndy's user avatar
0 votes
1 answer
253 views

How much of installed solar power is usable on average?

1 GW is the equivalent of 8.76 TWh in a year. When you say that you installed 1 GW of solar capacity do expect that it will generate 8.76 TWh in a year? On average, how much would 1 GW of solar ...
Jonathan's user avatar
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2 votes
1 answer
446 views

How to directly wire a solar panel through the wall socket without a battery? [closed]

I apologize for this the multi-ponged line of questions. I am thinking, I can wire the solar panel to a pure sine wave inverter then use a extension cord with 2 male plugs, one going to the inverter ...
Justintimeforfun's user avatar
0 votes
0 answers
52 views

The most minimalistic solar charge controller possible: will it work?

I want to build a solar panels device that can supply power to my doorbell, which is installed over a gate with no access to wires or power. The gate has a "bar" on top where I can install ...
Filippo Possenti's user avatar
0 votes
1 answer
404 views

IEC 61851 - reason for minimum current?

I would like to understand the reason for the minimum charging current of 6 amps. This poses a serious limitation for people with charging stations and smaller solar installations. While they may have ...
Brad Richards's user avatar
1 vote
1 answer
151 views

How do I calculate the type and size of battery to use for this solar-powered USB charger?

I've been out of the electrical mathematics for a while and want to see what battery I need to do this. 5 V USB output, 5 V DC solar power panel (I do have two I could use together, assuming the ...
Serialthrilla's user avatar
1 vote
0 answers
87 views

How to calculate short circuit current contribution of a PV plant into network?

I want to calculate the short circuit current contribution of my PV plant. I have only data from the inverter manufacturer but I am not sure if I have to simply add up all the inverter's short circuit ...
Smrtngy's user avatar
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0 votes
1 answer
489 views

MPPT bulk charge voltage vs sealed lead acid battery fully charged voltage

I could do with some help making sure I understand some MPPT battery charging fundamentals. Been reading up on this but can't find anything that has made it 100% clear for me. An unloaded, fully ...
formerlolz's user avatar

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