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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How I connect my solar panels with a solar inverter? [migrated]

I have six solar panels with a voltage of 37.4V, with 17.39A and seven solar panels of voltage 42.8V with 11.69A. My solar inverter supports a maximum voltage of 500V and maximum current 100A. I just ...
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Safety of a polarized DC breaker between the battery and the inverter

DC breakers use a magnet to blow the arc into the quenching channel. If the current is flowing in the wrong directly, the arc is pulled into the guts of the breaker and can cause the arc to be ...
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Polarized DC breaker between the battery and the inverter [closed]

I'm setting up a 5kW off grid solar system and planning to install a 125A polarized Dc breaker in between the 5kWh lifepo4 battery and the MPPT inverter. I heard that a polarized breaker isn't ...
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Off-grid computing

I am designing the electrical system for a school bus to tiny home conversion (skoolie, by jargon.) The current iteration is entirely solar powered, somewhere around 2640 W in panels, and likely 1000 ...
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Small vs large inverter efficiencies

I want to run a 60W device 24/7 through an inverter as efficiently as possible. I see that inverters become very inefficient at low loads relative to their capacity. Is this only because of factoring ...
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Battery capacity and parallel vs. series battery connections

Say you have 4 200 Ah 12 V batteries connected in parallel, this as I’ve come to learn increases the amp-hour value and not the voltage, and say you have another system same as that but connected is ...
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Is 3 amperes at 5V drawing the same power as 3 amperes at 12V?

I know that amperes are volts x watts. If I draw 5V at 3 amperes, is it almost the same as drawing 12V at 3 amperes from a 12V system? I expect the 5V would draw more as there is inefficiency when ...
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Charging batteries with both an inverter and solar panels

I have an inverter, a battery bank, a PWM solar controller, and some solar panels. The inverter also supports charging the batteries from the mains power. So if I just plug the inverter into a wall ...
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2 votes
1 answer
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Frequency reading 180 Hz on only one line to line measurement in three-phase backup 60 Hz LP gas powered generator in idle mode

I am running into an issue I don't understand why is happening. I have found how to "fix" it, but I am interested in ideas on what the actual source of the issue is Short version: I have a ...
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How to model solar photovoltaic array in spice?

This is the circuit I need to simulate in KiCad and ngspice. simulate this circuit – Schematic created using CircuitLab Can I encapsulate the above circuit into a variable in ngspice so that ...
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Safety check - Is this Amazon PV combiner box labeled wrong? 15A Vs 32A - 500V vs 1000V

I'm currently working on a solar circuit. I wanted to protect my internal systems from my panels in the event of a surge. I purchased a PV combiner box from Amazon - link to product. It claims to be a ...
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Can I charge a laptop with a solar panel? [closed]

I have bought a 30W solar panel, with output: USB 2.0 : 5V/2.4A USB3.0 (QC3.0): 5V/2.4A, 9V/2A, 12V/1.5A DC: 18V/1.66A (Max) I would like to charge my laptops. I have seen this power bank of 90 W, ...
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Convert kWh during a 1 hour period to average 15 min kW output

If I have a photovoltaic system that outputs 100 kWh from 1PM - 2PM on a given day and I am trying to figure out what the average 15 minute kW would be during that time period, would that be equal to ...
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Balance 3 phase inverter output

I have a 6kw pv solar system with a 3 phase inverter which splits the generated electricity equally across the 3 phases. I can't resell the excess capacity back so I want to make the most use of the ...
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Using an existing MPPT charge controller and solar panels with new battery pack

I have an off-grid setup at the moment to power most of my DC devices (bulb, router, NAS, NVR, etc.) I'm planning to upgrade my setup to a more powerful AC off-grid system to power my entire house. My ...
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2 answers
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Clear my confusion on PV or PQ nodes of power system with renewables?

A solar PV is connected to a node of the power system through a converter circuit. Is it possible to understand that the solar operating at maximum power point(MPP) be considered as a PQ node? or a PV ...
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What variable power electronic to use for boiler heater?

I am running a PV-Solar system together with a heat-pump in Germany. Excess electric power is fed into the grid, however I am only allowed to feed in 70% of the peak capacity. During solar noon, I ...
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I am building a small off-grid solar power setup; I need help with the battery size and combination

I have four 12 V large tubular deep-cycle lead-acid batteries and I want to know which one of these is a better set-up and why: combine two batteries to make one 24 V battery; this way I will have ...
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Using 210 V DC to a 220 V AC heater: is it going to work?

I'm considering building an off-grid solar system piece by piece. I can afford a couple of solar panels, after that an inverter, and finally batteries. I was thinking about finding a practical ...
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Can I use 10A solar controller with one 445 watt panel

I am wondering if I can use 10A PWM controller with 445 watt or 625 watt solar panel.
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Can I estimate irradiance from photovoltaic panels' output data?

I'm trying to figure out a way to estimate irradiance from the data I get out of photovoltaics panels; irradiance, or any other variable that would be appropriate to my use case/context, which I hope ...
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4 votes
4 answers
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Are solar panels ever used to remove energy?

Solar panels convert energy from the sun into electrical energy. Following the first law of thermodynamics, this means they remove some of the solar energy that would otherwise most likely be absorbed ...
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How to factor roof angles and inverter efficiency in sizing a solar PV system?

I want to install a number of Mission Solar 420 W PV panels (pdf) on my roof. By estimating an average of 5 solar hours per day over the course of the year, I believe I need 9 kW of panels. So by a ...
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Can I use 10A multimeter to test 445 watts solar panel

I want to know if I can use a cheap multimeter, model DT-830D, which has a maximum current rating of 10A to test voltage and amperage of a 445 watt solar panel with the following characteristics: <...
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CN3722 solar controller does not stop charging

I have this custom PCB witha CN3722 module. I charge two 18650 batteries. Resistors XVR7 and XVR6 are calculated for 8.3 volts. The charger charges the batteries and the "done" LED turns on ...
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Solar Battery Charging Circuit

I designed this circuit: to charge my 12 V UPS battery from a 40 W, 18 V solar panel. I specifically included an LM317T adjustable voltage regulator to control the output voltage to about 13.4 V as ...
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How does solar PV modules array Power, Voltage in Series/Parallel affect maximum power efficiency

I have been struggling with my homework on my course (Solar PV Panels) today. Edit : PV Module parameters are below. These are for STC. In our case, it's 650 W/m^2 and 55°C. I have calculated IL and ...
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Grid-tied micro-inverters and lightning risk

Consider a roof-top solar generation plant. Usually here, a bunch of panels are connected in series to a "string" inverter. So, DC voltage goes up to hundreds of volts. I gather that this ...
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How do DC solar optimizers work in series?

Tigo and SolarEdge both have solar DC power optimizers. These have MPPT built in and optimize the panel. That is, the panel gis connected to them, then the optimizers are hooked up in series to each ...
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Switching large batteries between 12 V and 48 V connections

I have four 200 Ah batteries that I am using to drive two separate really high current loads. The first load is 12 V at around 400 A and the second is 48 V at around 120 A. I was wondering if I could ...
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Measuring voltage on different ground reference – PV

I have a small solar power installation and I want to monitor all the data from it. My only problem left is that the solar panel input doesn't have common ground with batteries (or atleast there isn't ...
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3 votes
2 answers
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Wiring different amp hour batteries in parallel

Can I wire 2 lithium batteries of the same make but different amp hours in parallel? I need 300 Ah in my battery bank. Can I wire a 12 V 200 Ah lithium battery and a 12 V 100 Ah lithium battery in ...
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1 answer
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Running load directly off solar panels (bypassing charge controller) - Silicone heater

I am working on a solar setup that is powered by a Li-ion batteries. However, Li-Ion batteries can't be charged below 0 deg C, and thus if it dies in the winter, it will need to be warm before it can ...
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-1 votes
1 answer
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Efficiency of a solar cell

I am from Colombia where recently was opened a solar park with a power of 61 MW link to news I consulted the Solar radiation in the area and has a value of 5 kWh/m², the solar cell efficiency is 20%, ...
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Is it possible to setup a grid tied solar only PV system? [closed]

Is it possible to set up a grid tied solar only PV system? I can't have battery storage system because of budgetary reason. I have a school which have around 5kW load and I want to add an on-grid ...
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Parallel-series connection of an odd number of solar cells

I plan on having the following array in my system: Vmpp voltage at max. power point for each cell is 1.67 V Impp current at max. power point is 18.4 mA As the number of cells in the right "...
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1 vote
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How to combine three different DC voltages from solar arrays with voltages up to 360 V into one DC voltage for input into an inverter?

Possible solution: Convert each DC input into high frequency AC. Connect each AC voltage onto a separate primary winding of a toroidal transformer with one secondary winding. Supply to each primary ...
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Solar charging an Ebike

I would like to charge an Ebike battery (48 V) with solar panels (12 V out). I would prefer not to use inverter to 240 V (which current charger requires). Can I connect MPPT directly to EBike battery? ...
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-2 votes
3 answers
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Benefits of having one 12V 200Ah battery vs six 2V 200Ah batteries connected together since you're getting the same energy output?

Why would one choose to have 6 batteries of 2 V 200 Ah connected together in a series connection instead of a single 12 V 200 Ah battery or the other way round? From my calculations they all give you ...
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Building a hybrid ultra-capacitor and battery bank

I have a project that I need input on. Is it possible to build a hybrid bank out of ultra-capacitors (UC) and batteries? The generalized flow of the system I'm thinking is from solar (48V) to UCs (48V,...
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Using 500W to power a 4kW electric heating element

I have a 120 liter water heater powered by a 4kW heating element. I own two 350W solar panels totalling ~700W out of which I expect to reliably draw ~500W of power. I am looking for a way to take the ...
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12V power point socket keeps burning out, apparently from power surge

I have a simple solar power setup: 40 watt panel with built-in charge controller (https://www.canadiantire.ca/en/pdp/coleman-40w-folding-solar-panel-0112043p.0112043.html) 12V marine battery (https://...
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Solar MPPT, 24v deep-cycle battery wiring (Parallel and Series combined)

I'm asking here in case any of you can offer some insight, I have 4 x 110AH 12v Leisure deep-cycle lead-acid batteries; wires in series and parallel to bring the array voltage to 24v. I have 200w PV (...
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What diode do I use when charging 2 batteries in parallel?

I am a rank amateur in electronics, so please assist. I have a solar system (PV) charging 2 x 12v / 100Ah Lead Acid batteries for emergency lighting in my house (Max charge 13.8v). I also have an ...
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PV voltage spike causing charge power to drop randomly

Need some help with an issue. I have a MUST 5 kW hybrid inverter (this is probably a Voltronic white labelled inverter) and its MPPT range is 64-130 V, 9 x 375 W Fivestar solar panels connected with 3 ...
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0 votes
2 answers
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Is it a good idea to charge multiple Li-Ion batteries using a single buck converter?

I am trying to implement a DIY MPPT into my solar tracker project and I wanted to know if it was possible to charge all of the three li-ion 3.7v batteries in series with just one feedback buck ...
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1 vote
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PV operation points due to load changes

I couldn't find anywhere what happens to the operation point of a PV cell, when, a resistance (load) connected straight up its output, changes (step) from one value to another. With other words, ...
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13 votes
8 answers
3k views

Do solar inverters dump excess generated energy as heat?

I have a off-grid solar system and it got me curious, how is my inverter able to know how much excess energy is being produced? I could not show the actual graph from the app but it's really close to ...
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5 votes
2 answers
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Can I use a 10W solar panel to charge a 6V battery?

I got a 10W 17.5V 0.58A solar panel which I intend to charge a 6V battery to power up my components. I was thinking of using the panel to charge a 6V 4AH battery. I read online saying that to charge , ...
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Solar System Grounding

Solar panels and structure should be grounded to DC or AC? Inverter chassis/body should be grounded to AC or DC?
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