pv   1601

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UtilityAPI - Business Products
they sell a software product that lets you get access to your customers' utility data - could be a good integration
solar  pv  software  dep  data 
6 days ago by aaronbeekay
Energy Toolbase | Proposal Tools for Solar PV and Energy Storage
Pretty impressive proposal tool. Is this better than doing it ourselves?
dep  solar  pv  tool  software 
6 days ago by aaronbeekay
9 Really Useful Tricks With pv- Pipe Viewer
1) Simulate typing
echo "You can simulate on-screen typing just like in the movies" | pv -qL 10
This will output the characters at 10 per second.

2) Monitor progress of a command
pv access.log | gzip > access.log.gz
Pipe viewer is a terminal-based tool for monitoring the progress of data through a pipeline. It can be inserted into any normal pipeline between two processes to give a visual indication of how quickly data is passing through, how long it has taken, how near to completion it is, and an estimate of how long it will be until completion.

3) live ssh network throughput test
yes | pv | ssh $host "cat > /dev/null"
connects to host via ssh and displays the live transfer speed, directing all transferred data to /dev/null

4) copy working directory and compress it on-the-fly while showing progress
tar -cf - . | pv -s $(du -sb . | awk '{print $1}') | gzip > out.tgz

What happens here is we tell tar to create “-c” an archive of all files in current dir “.” (recursively) and output the data to stdout “-f -“. Next we specify the size “-s” to pv of all files in current dir. The “du -sb . | awk ?{print $1}?” returns number of bytes in current dir, and it gets fed as “-s” parameter to pv. Next we gzip the whole content and output the result to out.tgz file. This way “pv” knows how much data is still left to be processed and shows us that it will take yet another 4 mins 49 secs to finish.

5) Copy a file using pv and watch its progress
pv sourcefile > destfile
pv allows a user to see the progress of data through a pipeline, by giving information such as time elapsed, percentage completed (with progress bar), current throughput rate, total data transferred, and ETA. (man pv)

6) Another live ssh network throughput test
pv /dev/zero|ssh $host 'cat > /dev/null'
connects to host via ssh and displays the live transfer speed, directing all transferred data to /dev/null

7) dd with progress bar and statistics
sudo dd if=/dev/sdc bs=4096 | pv -s 2G | sudo dd bs=4096 of=~/USB_BLACK_BACKUP.IMG
This command utilizes ‘pv’ to show dd’s progress.

Notes on use with dd:

— dd block size (bs=…) is a widely debated command-line switch and should usually be between 1024 and 4096. You won’t see much performance improvements beyond 4096, but regardless of the block size, dd will transfer every bit of data.

— pv’s switch, ‘-s’ should be as close to the size of the data source as possible.

— dd’s out file, ‘of=…’ can be anything as the data within that file are the same regardless of the filename / extension.



8) [re]verify a disc with very friendly output
dd if=/dev/cdrom | pv -s 700m | md5sum | tee test.md5
[re]verify those burned CD’s early and often – better safe than sorry –

at a bare minimum you need the good old `dd` and `md5sum` commands,

but why not throw in a super “user-friendly” progress gauge with the `pv` command –

adjust the “-s” “size” argument to your needs – 700 MB in this case,

and capture that checksum in a “test.md5” file with `tee` – just in-case for near-future reference.

*uber-bonus* ability – positively identify those unlabeled mystery discs –

for extra credit, what disc was used for this sample output?

9) time how fast the computer reads from /dev/zero
pv /dev/zero > /dev/null
my stats 217GB 0:00:38 [4,36GB/s]
linux  shell  command  pv 
14 days ago by iteruel
'Digital Grid Router' Used to Transfer Solar Electricity - News - Solar Power Plant Business
Close but not quite P2P distributed generation, and thankfully without a blockchain. But without a central ISO operator to manage the external controller, this seems a little stunted.
distributed  generation  solar  PV  home  energy  storage  battery  HEMS  grid  management  power  generator 
14 days ago by asteroza
Twitter
has released the new Feed-in-Tariffs for 2019. rates look promising. is below expectati…
Offshore  Taiwan  PV  Wind  from twitter_favs
6 weeks ago by schee
DRP-3200-MEAN WELL Switching Power Supply Manufacturer
This is a pretty small (1/4U?) 3.2kW rack mount rectifier. It's only 24/48V output, but isolated.... they could be stacked ...?
dcdc  powerconversion  rectifier  dep  pv 
8 weeks ago by aaronbeekay
High-Reliability Power Supplies
ugh, this is a really obnoxiously defense-focused presentation but should follow up on power supplies
dcdc  inverter  powersupply  powerconversion  dep  pv 
8 weeks ago by aaronbeekay
P2 Panelboards
got excited about this series from Siemens because their installer training has these listed at 500Vdc (“Z” voltage rating in the part number) - but this doc has them at 250Vdc...? need to investigate more
panelboard  powerdistribution  distribution  ul67  dep  pv  microgrid 
8 weeks ago by aaronbeekay
Basics of Panelbaoards
Siemens course with info on fundamental panel board specification criteria and junk, pleasantly beginner-level
dep  pv  ul  regulation  electrical  learning 
8 weeks ago by aaronbeekay
Low Voltage Panelboards
can’t tell if they’re specifying dc ratings
ul67  pv  dep  panelboard 
8 weeks ago by aaronbeekay
Firefighter Safety and Photovoltaic Installations Research Project
Underwriters Laboratories examined fire service concerns of photovoltaic (PV) systems. These concerns include firefighter vulnerability to electrical and casualty hazards when mitigating a fire involving photovoltaic (PV) modules systems

this looks like a fun job lol
safety  ul  regulation  pv  dep 
8 weeks ago by aaronbeekay
OpenNEM: An Open Platform for National Electricity Market Data
Historical market data for Australian Energy Market Operator (AEMO) with energy sources and loads
energy  renewable  NEM  AEMO  electricity  market  greenhouse  gas  GHG  emissions  carbon  coal  hydro  wind  solar  photovoltaics  pv  battery  batteries  grid  biomass  natural 
9 weeks ago by adriaanbw

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