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Babysteps into 18650
#1
Video 
Hey guys, 

Been watching this forum for a while... finally i started with this project... i'm not a typer, i prefer to vlog my projects, hope you guys are ok with it!

Still, a lot of questions i didn't find an answer to....

like,
what u guys suggest for fuse wire (not us, so AWG isn't directly available)
which solar inverter for small powerwalls,
bushbar diy or those nikkel plates?
12v or 24v... or more?

Hope to learn a lot here!

Thanks
The powerwall section starts at 1min35....


hbpowerwall likes this post
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#2
Most answers can be found here, but mainly depends on what you wan't to do. Power a whole house. Just some equipment? Provide some information and you will get answered.
My Powerwall Build Thread

Maniac_Powerwall: 1x 14S100P 18650 LiIo, 6x 345W LG panels, MPP Solar PIP5048GK, Batrium Watchmon4 BMS
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#3
The idea is to start with only my shed…
What's in there, well some powertools offcourse, the lightning for the garden (aiming to replace lightning with low wattage 12V led's)
and the most tricky thing in there is the pool setup... a 400W pump that runs about 7 hours a day and a pool heater of 2Kw....
So i'm aiming for an upgradable setup.

First i want to buy a solarpanel or 2 (290W) connect them in series (24V) and then with an inverter to a charger…. i've been looking into those things, but here are so many inverters arround, i got no clue where to look at....
Also, i want to get an relayable monotiring system, I saw that AJW22 is using a raspberry with grafana, and this looks good…

But then again… how trusty is this all….

Dream is to got everything running off grid, but the house itself is a diffrent story... (4 woman and an electric car) so that will be a very big battery…

Greetings
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#4
(02-18-2020, 07:30 AM)Pietershomeprojects Wrote:  there is the pool setup... a 400W pump that runs about 7 hours a day and a pool heater of 2Kw....
So i'm aiming for an upgradable setup.
400w * 7 = 2800wh  +  2kw * 5hrs/day = 10000wh.   That's in the range of 13kwh/day  or 13*31days = 403kwh/summer-month.

If you're climate is similar to mine - you'll need around 9 x 300w panels for the above - e.g. a 2700w PV array.   A Midnite Solar Classic 150 charge controller needs at least 3 x panels in series for 120v - but can grow up to 12 or 15 panels.   So as an example, you might invest in equipment that can start at 3 panels but grow to 12 or 15.    I use 285w panels and have 15 of them per each Classic 150 for 4275w each.

Pump and tools require spikes in power and heater is 2000watts - so you need a 3000watt - 4000watt inverter.  A 48v battery would better for this level of power as 4000w/48v = 83amps.  If you go 24v that would be 166amps - getting up there Smile

Personally - if its OK budget wise I would think in terms of starting with 3 x panels (in 280 - 330w range - e.g. 120v input voltage range) and a 48v battery bank and get equipment than can size up to the 9,12,15 panel level and 4000w inverter level. 

Note: I find PVWatts ( https://pvwatts.nrel.gov/pvwatts.php ) a free/accurate way to get good estimates of PV power for your exact location.   Its been within 10% +/- accurate with my city.
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#5
Wow, big plans. To power everything I agree wit OffGridInTheCity. Gotta go big. Definetly a 48V System and rather big Powerwall. Maybe 14S80P or even bigger. Better 6 Panels depends on where you are located.

Also just looked your video. I think you will not get very happy with these chinese cells... Just my thought.
My Powerwall Build Thread

Maniac_Powerwall: 1x 14S100P 18650 LiIo, 6x 345W LG panels, MPP Solar PIP5048GK, Batrium Watchmon4 BMS
Reply
#6
(02-18-2020, 05:32 PM)OffGridInTheCity Wrote:
(02-18-2020, 07:30 AM)Pietershomeprojects Wrote:  there is the pool setup... a 400W pump that runs about 7 hours a day and a pool heater of 2Kw....
So i'm aiming for an upgradable setup.
400w * 7 = 2800wh  +  2kw * 5hrs/day = 10000wh.   That's in the range of 13kwh/day  or 13*31days = 403kwh/summer-month.

If you're climate is similar to mine - you'll need around 9 x 300w panels for the above - e.g. a 2700w PV array.   A Midnite Solar Classic 150 charge controller needs at least 3 x panels in series for 120v - but can grow up to 12 or 15 panels.   So as an example, you might invest in equipment that can start at 3 panels but grow to 12 or 15.    I use 285w panels and have 15 of them per each Classic 150 for 4275w each.

Pump and tools require spikes in power and heater is 2000watts - so you need a 3000watt - 4000watt inverter.  A 48v battery would better for this level of power as 4000w/48v = 83amps.  If you go 24v that would be 166amps - getting up there Smile

Personally - if its OK budget wise I would think in terms of starting with 3 x panels (in 280 - 330w range - e.g. 120v input voltage range) and a 48v battery bank and get equipment than can size up to the 9,12,15 panel level and 4000w inverter level. 

Note: I find PVWatts ( https://pvwatts.nrel.gov/pvwatts.php ) a free/accurate way to get good estimates of PV power for your exact location.   Its been within 10% +/- accurate with my city.

Heyhey,
About the climate, i got a solar setup right now (on grid) of 4,5Kw) and I got about 4Kw a year.
I’m looking for solar panels, and I wanted to add 15 or so… I got the space for it so ?
I’ve seen 290Wh panels for a good price….
I’m from Belgium, so we work with 220V systems…
 
I love the idea of expandable like you said, start with 3 and grow from there on…
If I leave out the heater to start with, since I don’t want to go into 48v (yet)….
 
The midnight solar classic looks good, but to begin with, a little bit too expensive (for now) if I calculate everything I want… the price tag is a little bit to much (did I mentioned I got 4 woman in the house???)
So, you suggestion, 3 panels and an 48v bank… ok, but I need more batteries for that…. But what “cheap” converter will do to start with? Which BMS (also since I’m getting into this, not too expensive)
And ofcourse, available in EU would be nice..
 
I tried the site, and yes they are pretty close!

(02-18-2020, 05:41 PM)Maniac_Powerwall Wrote: Wow, big plans. To power everything I agree wit OffGridInTheCity. Gotta go big. Definetly a 48V System and rather big Powerwall. Maybe 14S80P or even bigger. Better 6 Panels depends on where you are located.

Also just looked your video. I think you will not get very happy with these chinese cells... Just my thought.

Thanks,

Well, about those chinese cells... the thing is, in Europe, you'll pay 10 - 14$ for 2 cells.... so i don't know where else to get them, for a reasonable price... i'm starting to look for used batches... but here, it's hard to do with our regulations...
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#7
I know why they seem to be attractive to us :-) But they are most very bad. No good quality, not reliable. As I said most of them. There are ways to get cells cheaper than 10-14$. I'm from Germany and get new cells like these you got, aroound 2600 mAh for about 4 Euros, maybe less. And used cells on Ebay even cheaper of course. But I don't know your regulations in Belgium. But I think we got other members from your country here. Maybe ask them how they did?

Have a look what you can get. You'll need alot. Like at least 1000 cells and up.
My Powerwall Build Thread

Maniac_Powerwall: 1x 14S100P 18650 LiIo, 6x 345W LG panels, MPP Solar PIP5048GK, Batrium Watchmon4 BMS
Reply
#8
Maniac_Powerwall Wrote:I know why they seem to be attractive to us :-) But they are most very bad. No good quality, not reliable. As I said most of them. There are ways to get cells cheaper than 10-14$. I'm from Germany and get new cells like these you got, aroound 2600 mAh for about 4 Euros, maybe less. And used cells on Ebay even cheaper of course. But I don't know your regulations in Belgium. But I think we got other members from your country here. Maybe ask them how they did?

Have a look what you can get. You'll need alot. Like at least 1000 cells and up.
 well, 4 euros isn't that bad... but like you say... >1000 cells, is €4000.... and i think i can't convince my wife to spend so much money... for a project Tongue

I'm going to start with what i have, and see further on from there… thinking about buying 3 solar panels next month… and a simple, cheap mppt charger… and work my way up from there…
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#9
I couldn't find a local source for good & cheap fuse wire, so I strip and take apart tin(?) coated copper AWG22 wire, which yields 17 strands of ~AWG34.
Breaks at 5A~7A.  I run at max 0.5A, so quite happy with these.
Most people seem to be using thicker wires of AWG32~30.


(02-18-2020, 07:30 AM)Pietershomeprojects Wrote: Also, i want to get an relayable monotiring system, I saw that AJW22 is using a raspberry with grafana, and this looks good…

It works well, and I can even view the status from my phone from anywhere in the world as long as I have Internet connection. 
I recently added Wifi SmartPlugs that can be controlled from the PaspberryPi.  For now (winter) I use it to disconnect my GTI when battery capacity is low and electricity is cheap (off peak hours).  In the near future, I intend to smartly control loads such as water heaters, pumps for watering the garden, etc.

Fuse wire: It doesn't need to be AWG measurement. You just need wires that have a cross section of around 0.02~0.05mm^2.
https://www.powerstream.com/Wire_Size.htm
Modular PowerShelf using 3D printed packs.  50kWh and growing.
https://secondlifestorage.com/showthread.php?tid=6458
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#10
Yes for sure just start and see where it goes. Nothing bad about!

Fuse wire can be bought here:

https://www.ebay.com/itm/36-SWG-Tinned-C...:rk:1:pf:0

Cheap and enough for a lifetime. Ship from GB. They have different offers.
My Powerwall Build Thread

Maniac_Powerwall: 1x 14S100P 18650 LiIo, 6x 345W LG panels, MPP Solar PIP5048GK, Batrium Watchmon4 BMS
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