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There's a new wall in Germany!
#11
It would be great to know your used devices: inverter, charge controller, and bms.
Thanks!
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#12
(06-10-2017, 05:29 PM)The-J-Man Wrote: Looks pretty cool. I like the fact that there are more and more projects in germany.
Officially you have to register a PV battery with the state or power company or whatever, is yours registered or unofficial? I presume you have to register it so they can put some tax on us at one point Big Grin
I wont be registering mine as it will be totally off grid.

all the best!

thanks a lot Smile . Well, I don't know about registration for off-grid systems here, the only thing I know is, that you have to register your PV system if it has more than 10kWp or you're feeding back to the grid. In this case, you'll also have to pay some kind of tax ("EEG-Umlage") for the power you produce.
But as far as I know, I don't have to register my battery and therefore it's not registered Big Grin.

(06-11-2017, 02:19 PM)Newidea Wrote: It would be great to know your used devices: inverter, charge controller, and bms.
Thanks!

Charge controllers: 1x EPSolar Tracer 2210RN (20A), 2x EPSolar Tracer 3210RN (30A)
Inverter: Westech WT Combi ECO 3000W (off-grid, single phase, auto-switching)
BMS: none (as described here)
Balancers: 7 x 1S single cell balancer (see here)
Batteries: 8 x sealed lead acid, 940Ah/32kWh, 1400 x 18650s (200p7s, 420Ah/10kWh)

Cells tested: 6.096 (overall: 12.084 Ah, average: 1.982 mAh)
Cells in production: 3.360 (overall: 7.056 Ah, average: 2.100 mAh)
Powerwall setup: 7s480p, 1.008 Ah, 26 kWh
Project page
Live solar/powerwall values
Daily graph
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#13
Are you happy with your balancer ? how much did you pay for those ?
It seems a good alternative to expensive Batrium products.
Current setup: 21x 215wc poly, 7.5kWh 7s 18650, PIP 2424msxe.
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#14
I wouldnt call batrium expensive. 14USD per pack is not much Smile Those linked 1s balancers are heckalot more expensive in terms of what they do.

1s cost 20USD each compare to batrium at 14USD each. yes you have to buy the main board for Batrium but you get so much more in terms of monitoring and controlling. Since that system can control alot of external parts. So as soon as you go above 14 units its cheaper. But if you go with lead acid the Batrium will not do it. since they are for lithium. Though lead acid generally dont need much of balancing in real life if its setup correctly. (But of course it doesnt hurt and you may save some cycles)

if you want cheaper bms you need to go to one of those 30USD-100USD complete packages but they generally are pretty cheap quality.

The 1s works and do what they should just fin. I have em to and tested them but they have no monitoring.
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#15
Respekt !!

How long did it take until all the batteries were together for the wall?

Mfg
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#16
14€ per longmon is not costly indeed, but the main board and the shunt are so it's a lot of money to start with just 7 or 14 packs.
Current setup: 21x 215wc poly, 7.5kWh 7s 18650, PIP 2424msxe.
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#17
(06-13-2017, 09:14 AM)coolfx Wrote: Are you happy with your balancer ? how much did you pay for those ?
It seems a good alternative to expensive Batrium products.

The balancers do what they should. Although from the specs, they should balance to around 10mV difference between the series, but I always meassure 30-40mV... but they didn't exaggerate with the balance current, max is 10A and I can confirm that. So overall, it's a simple and quite cheap balancing solution, especially if your system is 24V like mine.

(06-13-2017, 01:22 PM)daromer Wrote: I wouldnt call batrium expensive. 14USD per pack is not much Smile Those linked 1s balancers are heckalot more expensive in terms of what they do.

1s cost 20USD each compare to batrium at 14USD each. yes you have to buy the main board for Batrium but you get so much more in terms of monitoring and controlling. Since that system can control alot of external parts. So as soon as you go above 14 units its cheaper. But if you go with lead acid the Batrium will not do it. since they are for lithium. Though lead acid generally dont need much of balancing in real life if its setup correctly. (But of course it doesnt hurt and you may save some cycles)

if you want cheaper bms you need to go to one of those 30USD-100USD complete packages but they generally are pretty cheap quality.

The 1s works and do what they should just fin. I have em to and tested them but they have no monitoring.

You're right, the Batrium system is much better because of the monitoring functions. At the time I bought my balancers, I didn't know about Batrium, if I would, I maybe would have bought their solution. But on the other hand, I wouldn't have the challenge and the fun to build my own monitoring solution now Big Grin
Everythings-stuck-together likes this post

Cells tested: 6.096 (overall: 12.084 Ah, average: 1.982 mAh)
Cells in production: 3.360 (overall: 7.056 Ah, average: 2.100 mAh)
Powerwall setup: 7s480p, 1.008 Ah, 26 kWh
Project page
Live solar/powerwall values
Daily graph
Reply
#18
coolfx. Thats true. The shunt cost but comparing to the 1s balancer that neither have monitoring nor shunt Wink


I can also say that there is ongoing work on getting a new shunt type that will be more directed to DIY... And the price shall be in our area too!
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
Reply
#19
That's good to know, I will wait before buying anything to see what's coming !
Current setup: 21x 215wc poly, 7.5kWh 7s 18650, PIP 2424msxe.
Reply
#20
(06-13-2017, 03:33 PM)IronSky Wrote: Respekt !!

How long did it take until all the batteries were together for the wall?

Mfg

thanks Smile
Harvesting and testing cells took about 5-6 months, building it only 3 weekends, including bending and soldering work. Here're a few pics from the building process:
rbev, Herbie, grgdgreek And 5 others like this post

Cells tested: 6.096 (overall: 12.084 Ah, average: 1.982 mAh)
Cells in production: 3.360 (overall: 7.056 Ah, average: 2.100 mAh)
Powerwall setup: 7s480p, 1.008 Ah, 26 kWh
Project page
Live solar/powerwall values
Daily graph
Reply


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