Na+ DIY portable 200W AC powerbank 16V 10Ah

[SiB77]

Hello from Finland (europe, scandinavia)!

New member here. Found some cool Na+ cells on Aliexpress and i just had to have them. 4 pcs of 10Ah Na+ cells. These go empty @ 2V and full @ 4V. So 8V-16V. Project is not finished yet but i have been experimenting with cells, inverter and protection board (for Na+ cells).

I charged battery cells with lifepo4 charger to 14.4V (16V 2A charger is on its way as is 2A active balancer) and plugged BM500 bluetooth battery monitor. Surge amps was staggering 260A@14.4V that is almost 3.8Kw from these little 10Ah cells! Car jumper pack, lol?

Inverter is 200W (with fan) modified sine wave. It can be adjusted by hertz 50-60 and shape of modulation. Not the best one but it will do for now.

Protection board triggers every time when i plug something into inverter, even phone charger. It is broken or bad design. It freaks when there even smalles voltage drop. I even tried putting extra cap 25V 2200f after protection board, it helped little and did not trigger on phone charger but 30W heat glue gun triggered it again. Suggestions?

Active balancer is on it´s way.

16V 2A wall charger is also coming soon.

I have PWM solar controller (yes, those cheap ones) that i am going to plug to system and wire XT60 for panel connection.

Also i have 100W solar panel that i will use to charge this box when outdoors. I already had it couple of months taped to roof of my car that charged sound system battery (120A LiFePo4). That worked great. Car parked out for days job, go home and blast some tunes! Car is electric so i didn´t want to plug any of custom car audio devices to car original electronics.

I hope this project is intresting to someone and you like to follow up. I weren´t sure where to post this but it´s new battery tech so maybe here?

- Mikko, Finland

 

[SiB77]

Used some plexiglass to make braket for cells.



That worked better than expected. Need to clean those edges.

Installed fan, easy. Hole not so easy. Got no right tools so needs cleaning.



Something like this.





Next: cut 4mm aluminium pieces for + & - , drill holes and make them threaded. I need 3 wires to both posts. One for inverter, seconds for 12v sicarette outlet (got inline fuze box ready) and third for solar panel controller. No room to directly connect to cell post. And it will look better than total snake nest of wires.

Intrested? I am thinking of making video of project. It will be easy to start filming now when it´s half done. I have lot of crazy ideas what to do with portable ac powerbank.

 

[SiB77]

Happy holidays! I ordered very simple beginner 3D-printer. It has not arrived yet, but i have found lot´s of things i can use it for. Car audio projects, battery and solar stuff and so forth. I did had couple of courses of cad designing at school so not that much of punch in the face. And those tutorials on youtube are great (at 1.5 x speed). Learning a lot.

Other parts are on their way so not much more to update for now.

 

[freemanson]

I have ordered same battery in a smaller batch to verify they are real sodium. Will follow this thread =) Kitos!
Will be using them on a boat for electric propulsion. 80 pcs batteries as a starter. Currently trying to find a bms that is suitable for NA batteries.
Found this one -
https://hakadibattery.com/products/...-battery-cells-smart-bms-for-diy-battery-pack
and will have to buy 10 pieces , one for each serial string? (each serial string will use 8 batteries 8S) or is it better to buy a bms that can handle multiple strings of series? If so what type? Preferable a reprogrammable so it can be used for NA/Sodium Ion.
New to all of this but I am learning.

 

[SiB77]

8 series 10 parallel will make 16-32V 100Ah battery. You need one BMS: 8S 24V 200A will work great.

Got my 3D-printer. Work has started:

 

[SiB77]

Progress.

 

[SiB77]

I was thinking about adding light into box. But things kinda sorted them selfs out. One 60cm led light didn´t fit bathroom, so i made end caps on that. Simple hook on other end and holed cap on other. Cable was old (you collect those too...) and found new life again. So so simple and fun.

 

[SiB77]

Finally some parts. Got my 4S active balancer, works ok. This one is 1.2A and i have 2A on it´s way too. Also printed busbar for power distribution. Quite simple design. Spot welded 0.2mm strip on back of bolts. Also i have master fuze that i can pop out and do all electrics and when all is good i pop fuze back, handy.

So 6 points on busbar. (1) power in (2) inverter (3) charger (4) +12V car plug (5) solar charger (6) not used. Same for + and -.

 

[upnorthandpersonal]

Tervetuloa foorumille!

Always nice to have more people from Finland on here. We almost have enough now to play a game of cards

Nice project. We're running some tests on those cells as well in the lab. Hopefully we have some data soon-ish.