floyd's powercabinet

floydR

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Aug 23, 2017
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I made it to the local electronics surplus store "Surplus stuff", where i picked up a heavy metal router cabinet (electrical component cabinet) 30 inches x24 inches x 6 inches approx 750 mm x 600 mm x 150 mm.
I installed a lock from the harbor freight cabinet fit perfect. Thinking of making a cover /box out of backer board (cement board) to keep the weather out. It will be in a outdoor shed.
I also picked up a pc power supply.
12v @12 amps
5v@ 15 amps
now just to make a charging board/power board for the Opuses.
with door closed

image_ahmbum.jpg
with door open

image_kiusqw.jpg

the paper taped to the door is a diagram of a router which is why I call it a Routerbox.
later floyd
 

floydR

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As reasonably priced/Free laptop batteries are getting hard to find in northern California least for me, I decided to buy some batteries from Alarmhookup.
I have 10 LG batteries arriving in a few days, then a few days after that I have 50 Sona batteries arriving. so 1200 batties in total to go with the 200 + I have on hand. Will keep me busy for a few weeks.
First I will make my lawnmower 24 v batteries about (70cells) Then I will start on a small power wall 24v using cells I have collected so far and 210 of the Sona cells. Approximately 350 cells 7s50p 2kwh. Once I have the proper technique down (soldering, Fusing, bus bar, etc) i will build a 48 v power wall or maybei will stick with 24v as that is what my inverter is.
Need to rebuild shed where the cabinet will live, install solar panels 12 100 watt panels, get a new solar charge controller, a new inverter etc.
later floyd
 

floydR

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Working too much, didn't get around to shopping for Christmas or i should say haven't made it to the stores yet. but I did manage to buy 6, 6 cells diy powerbanks online. they were delievered today. 4 gifts out o the way.

image_bnrdtd.jpg

only 5 here. 6th one I messed up on. installed a battery wrong and that was all that was needed.
I snapped the cover on one to make sure it would go on right. the quality is ok. not great but not terrible.

Later floyd
 

floydR

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I have a few hoverboard packs which i would like to keep in one piece, decided that would be easier for me.
I would be fusing both negative lead and positive lead of each pack.The packs would be in parallel. each pack has a BPB Battery Protection Board no balance function. Limited soldering on the build.
There are a few solar charge controllers that can be set up for lithium ion. and a few that will charge 36v battery banks.
I haven't worked out how I would check the temp in multiple places in/on the powerwall. Probably an Arduino based solution.

There would be a 2 pole dc magentic curcuit breaker between the PV--->cb---> solar charger-->cb--->inverter--->ac/cb--->sub panel(off grid)

This is as far as I have thought it out.

later floyd
 

floydR

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A quick update on my progress
The 36v hoverboard batteries are connected in parallel, 2 batteries per 20amp fuse on both positive and negative sides running to The main bus bars.
10mm copper tubing bus bar 10 awg tinned copper wire connects the bus bars to the 30 amp Circuit breaker 10 awg tinned copper wires connect to inverter.
Fuses used 20 amp @ 32v (not ideal i know)
Voltage 41.7 at circuit breaker
voltage 41.4 at inverter
I need to order some 15-20 amp 58v Fuses before building the battery banks. I want to have 4 36v 48AH banks might have to settle for 3.
I have a youtube video linked to this post https://secondlifestorage.com/t-has-anyone-used-Littelfuse-mini-58v-fuses?pid=25597#pid25597
the bank size would be 10s24p/ 12 10s2p batteries
Later floyd
 

floydR

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As you may be aware I decided to build a power cabinet out of 36v hoverboard batteries. I did a proof of concept test earlier this year. From that I upgraded the fuses to 20 amp fuses these are on the positive and negative side of each xt60 y connector. Then I used a 30 amp airpax dc circuit breaker between the battery and the inverter, The circuit breaker will be upgraded to a 65 amp airpax dc circuit breaker.
As my soldering skills are lacking, I happened upon resistance soldering. I built a small resistance solderer. here are t two bus bars I made tonight.

image_ganauc.jpg
 

Korishan

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Nice. thought it was a picture of a centipede at first :p
 

floydR

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My project slowed down to a standstill this last year. :( first it was work that kept me from working on the power cabinet. Then it was my health now I am getting back into working on the project. Might end up going about it in a slightly different manner.
later Floydr
 

floydR

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Was thinking about pre made lifepo4 battery packs all I would need to do is to setup a BMS hopefully the battery packs I am looking at will still be available when I am ready for them.

I may finish the 36v UPS setup I was working on before. But no more disassembling laptop battery/ hoverboard batteries (18650's)

later floyd
 

floydR

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Bought the Lifepo4 battery packs yesterday, There went the hobby budget that didn't get spent last year plus January's budget. an icharger x8 or 4010 will have to wait. Least I can continue working on the UPSes and the 36v hoverboard packs.

later floyd
 

floydR

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Much has changed since I started this project. Now i am again planning on a 48v LiFePO4 build. My cells are well used BYD 24v I have 2 of them @125Ah each so about 50%. also have 17 yhkam 90Ah that are testing from the 70's these I plan on 1 cell paralleled to each cell of the byds.
But first I want to test my growatt inverter so i am going to make a 16s battery out of them I have a 16s JBD smart Bms I will use on it. I have top balanced the cells two weeks in parallel after being charged to 3.65v once individually Then In 1s8p config 8 I could pick up at one time or else i would have done 1s16p charged to 3.65v twice. Then broken into 1s4p sections all of theses were connected in parallel. for two weeks.
The cells are now in 4s1p blocks waiting on me to find or build a box they will fit in. At which time I connect the 4s1p block into a a 16s1p battery pack.
Also I still am going to make a 14s80-160p bank out of the LGs 18650's I have, Install a 7s bms on the lg RESU I need to get busy!
Later floyd
 

400bird

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Apr 27, 2020
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I've been using 4 of the lg resu packs we picked up for the past few weeks.
Cycled something like 1000-1300 ah through them in a 2p2s config.
No issues. But, I'm only using them temporary while I prepare and build the permanent pack. So, these LG resu packs will stay in their temp home inside the bbq.

Where did you pick up the cabinet? Is the electrical surplus place still around? I'd love to check it out.
 

floydR

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I drove by surplus stuff today and all the signs were removed looks like it is closed. But one other time the store had moved so I hope the store just moved.
later floyd
 
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