Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [panel]

56 questions
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I need help with SCCR

I work as and E/E intern for a industrial panel company. A customer wants a 30kA SCCR panel. The input power is 3 phase 460V, an unknown distance from the main panel in the customer factory. Inside the NEMA 12 enclosure is a 2 phase transformer…
Jeff A
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Is it necessary to provide surge suppressor to every control relay?

We have a motor control centre installed in garage for a commercial outlet. The MCC has a SMC-Flex ( Low voltage soft starter). The control relays (700 HA33) are connected to the SMC control terminals. Most of the time the control relays connected…
DaSnipeKid
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New DIY project try to understand MPPT

I got used battery MODULE with the next specs "40V 18.4AH 736WH build of ninety six A123-26650 LITHIUM LIFEPO4 cell " Cell specs: Nominal Capacity: 2300mAh Voltage(nominal,V): 3.3V Internal impedance(1kHz AC typical,mΩ): 6 HPPC 10 Sec Discharge…
Hosamsad
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What is meant by the statement "variation at all measured points (including the ambient air temperature) does not exceed 1K/h"?

I am trying to understand a temperature rise test that is being conducted over a switchboard. The test conforms to IEC 61439-1. The clause 10.10.2.3.1 (Method of test - General) regarding the temperature rise states about the constant value. It…
DaSnipeKid
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ANSI color standard for panels

Enclosures for Electrical Equipment & Panels at Electrical Rooms, Substations and other facilities are typically "industrial grey" colored. From questions like in mikeholt.com, se.com, myperfectcolor.com and others, and some manufacturer catalogs…
Brethlosze
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Voltage present, even without fuse in DC distribution panel

I have an AC and DC distribution panel installed in my cargo trailer. And I think I have an issue with my DC side of the panel. This is my first electrical work of any sort and thought it was going well until I checked voltage at the end of one of…
Jay Cummins
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Storing solar panels in direct sun

What is the best way to store solar panels when not hooked to a charge controller in direct sun? I was thinking about hooking each panels pos and neg mc4 connectors to itself so it will not be damaged by water. Will this damage the panel?
rick
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Footprint panel is grayed on Altium Designer PCB

This is a project I imported from Eagle (not so bad by the way). I resolved all schematic compilation errors. But now I am facing some small issues in the PCB part: On the properties panel when I select any component, footprint is grayed. See…
Dony
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Necessary voltage to charge NiMH using Solar Panel

I'm trying to understand which voltage I need to charge my NiMH batteries so I can purchase the components to do this. Actually I have 2x AA Ni-MH 1.2 V 1900 mAh and 4x Solar Panel 2 V 220 mA (0.44 W). I read Solar Cell - Preventing overcharge of an…
user3649959
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Matching LCD controllers to LCD compatible panels

Over the years, I've accumulated numerous LCD panels and controller boards salvaged from TVs, Monitors, Cell Phones, digital picture frames, GPS devices and tablets. I would like to reuse the panels with the discrete controllers in my electronics…
user148298
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How much time needs a 120W/15V solar panel to charge a 48V/2.1KWH battery?

Could you help me with this problem? I'm building a solar panel with these characteristics: No. of Cells: 36 Cell Type: Mono-crystalline 125x125mm 3.42w Max. P: 123W PTC Power Rating: …
Doctor P.
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I have 2 LCD panels - I'm trying to find out what electronics I need to set them up

I have two LCD panels that I want to use, but they don't have any electronics, case or anything with them (I got them from a computer shop that was shutting down). I need to figure out what PCB they need and what plug / power supply, etc., I need…
Nathan Whyte
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Solar panel battery charger

I am looking for a way to power my webcam without having to use a long extension cord outside. I have come up with this circuit. Will it work? Can I improve it? Thanks in advance for the help!
Gelato
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Are PV panels convenient without incentives?

I finally finished a project in which I designed a 55 kW of PV system for a 50 kW load and I finally calculate costs and revenues over 20 years. I found that with a 25% of incentives for the cost of inverter and PV panels, I have a negative NPV (net…
Samuele Benito Di Gioia
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How are PCBs with castellated pins arranged in a panel?

Can anyone please describe to me how PCBs with castellated pins are arranged in a panel. My understanding is that castellated pins are formed by drilling the edge of a PCB then plating, similar to a normal via process (except the result is a plated…
pcbguy
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