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Let's design our own UPS
- Thread starter Thor
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Search outomatic transfer switch or automatic change over switch on takealot or geewiz. Not sure how to wire them but with enough time I'm sure you will figure the wiring out
I would not recommend soldering 2nd life batteries. For 999 out of a 1,000 I'm sure it will be fine... but it just takes one to really mess up your day. Have a safety protocol in place while you build your pack, Lithium fires are difficult to put out if it starts with a cell in the middle of a 100P battery. Etc, etc
Consider spot-welding with fusable nickel
Question: when you where testing your cells, did you cycle them at 0.5A or 1A and did you track and remove cells that started to overheat ?
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Pineapple Smurf
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RaptorSA
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Getting there on my project
Free salvaged 18650's
My 7S100P is almost complete
Taken over 3 months to test each cell
Average 2200mA each
This will be a 24v array (4.2v x 7 = 29.4 volts actually)
1540 amps @4.2volts
= busload
But the curve drops quickly to settle at 3.7v nominal so on this number we can calculate my power wall will be 5698Wh on average
Basically a 5killowatt battery bank
View attachment 1476677
Let us know how this works out.
I want to build a custom battery for my electric dirt bike one day and this is the kind of skills needed.
It would basically end up looking something like this:
I'm s**t scared of building one though, seems like one neesd to really know what you're doing.
RaptorSA
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That fit on the trolley is perfect and looks nicely balanced too.
That is going to work so nicely.
Yeah, still blows my mind that all the components line up like this.
I even ordered my own battery terminal crimp tool and some cables and lugs so I can create custom cables so the build can be as clean as possible.
It's starting to make sense at this point to maybe build one or two more of these and see if people would be interested in buying them. No idea if there's a market though.
The closest competitor in terms of price/performance that I've seem would be something like this:
But honestly, those things are ugly and the batteries seem to be made using second life cells.
I think the Growatt inverter is also nicer if someone wanted to disassemble the trolley in future and turn the components into a wall-mounted home hybrid solution with a decent sized solar array and WiFi monitoring included.
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wingnut771
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Doesn't the heat from the solder damage the cells?
$m@Rt@$$
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That's why you must spot weld them.
Pineapple Smurf
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There is a technique, and when using the correct amount of flux it looks pretty quick
Lots of Youtubers out there that have built massive power walls using this method
Trial and error I guess
wingnut771
Honorary Master
That is the point I was making.
Pineapple Smurf
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I have a spot welder
****ing difficult getting it right
Looks so easy on youtube
You have to choose the right current for the thickness plate
And then you also have to use the right downforce pressure as well
Not easy
Then again, practice makes perfect
****ing difficult getting it right
Looks so easy on youtube
You have to choose the right current for the thickness plate
And then you also have to use the right downforce pressure as well
Not easy
Then again, practice makes perfect
$m@Rt@$$
Expert Member
Split second too quick and the contact is ****ed and a split second to long and the contact is ****ed.
Pineapple Smurf
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Yup it is a weird thing indeedSplit second too quick and the contact is ****ed and a split second to long and the contact is ****ed.
Ive only used my spot welder twice
Looks like bird ****
Need lotsa practice
$m@Rt@$$
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And also remember to have them at a fairly low SOC when spot welding.
Pineapple Smurf
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Oh, didnt know that, my cells were all at 4.2v each LOL
I guess you can have a slightly smaller fire if something goes wrong.
On a serious note - if you get this down, I'd pay for a custom battery pack or 3. Always worried about diy'ers not fusing their cells cos I'm paranoid. (That's a lotta energy); so you're the first one I've found who is / will do that.
Oh wait, are you in CT?
Pineapple Smurf
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Hold my beer.
Haha yup in Somerset West
But you want a pack made up just go to this place.
I used them last year to repack my robotic vacuum cleaners and a friends one
Prices were pretty good, in Milnerton
REPACKING OF CORDLESS DRILL PACKS - Batteries Unlimited
REPACKING OF CORDLESS DRILL BATTERY PACKS 9,6V Repack 8 x cells (S/C NI-CD 2200MAH) @ R460.00 Incl. of VAT 9.6V Repack 8 x cells (S/C NI-MH 3300MAH) @ R 670.00 Incl. of VAT 12V Repack 10 x cells (S/C NI-CD 2200MAH) @ R495.00 Incl. of VAT 12V Repack 10 x cells (S/C NI-MH […]
batteries-unlimited.co.za
Thanks, will have a look.Hold my beer.
Haha yup in Somerset West
But you want a pack made up just go to this place.
I used them last year to repack my robotic vacuum cleaners and a friends one
Prices were pretty good, in Milnerton
REPACKING OF CORDLESS DRILL PACKS - Batteries Unlimited
REPACKING OF CORDLESS DRILL BATTERY PACKS 9,6V Repack 8 x cells (S/C NI-CD 2200MAH) @ R460.00 Incl. of VAT 9.6V Repack 8 x cells (S/C NI-MH 3300MAH) @ R 670.00 Incl. of VAT 12V Repack 10 x cells (S/C NI-CD 2200MAH) @ R495.00 Incl. of VAT 12V Repack 10 x cells (S/C NI-MH […]
RaptorSA
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Thanks to someone in china sleeping at the job I ended up having to tear apart my trolley build this weekend and do some of the cabling again.
Brand new multiplug, but the neutral rail wasn't secured in one of the little pegs.
So I'm testing my new inverter & battery build, thought I'd plug in the watt-meter and get some capacity readings as I'm discharging it.... next thing you know it's just sparks and explosions as the live and neutral become one.
So yeah if you're in the market for a multiplug I'd stay away from these.
Awful quality... from now on I'll just stick to Ellies multiplugs.
What I still don't understand is how it's possible for a person with one anus to leave behind three parallell brown stripes on the floor.
Brand new multiplug, but the neutral rail wasn't secured in one of the little pegs.
So I'm testing my new inverter & battery build, thought I'd plug in the watt-meter and get some capacity readings as I'm discharging it.... next thing you know it's just sparks and explosions as the live and neutral become one.
So yeah if you're in the market for a multiplug I'd stay away from these.
Awful quality... from now on I'll just stick to Ellies multiplugs.
What I still don't understand is how it's possible for a person with one anus to leave behind three parallell brown stripes on the floor.
