Open mikelovic opened 6 years ago
some thoughts:
Ecological materials:
We can replace the cover-plates with wood-plates . I would recommend multiplex/plywood of 12mm. Question is how to fix them onto the frame.
upcycling
Hmm, in a project which should be easy reproducable by others a more crucial aspect is the overall availability of the components from regular sources and a BOM which list that sources clearly. But you can maybe upcycle/use any appropriate plate-materials for the cover plates.
easy production
Biggest prob is the availability of pcbs in small numbers eg. <= 10 pieces. Commercial production from watterott is an option starting with 50 pieces, but we need smaller quantities for prototypes and their testing.
Possible solutions:
Btw., one thing which is even more important than "easy productions" is "easy maintainance".
moveable
I have added some nice handles to the upklib. See https://wiki.opensourceecology.de/images/8/80/Upk_handles.jpg and https://wiki.opensourceecology.de/images/6/64/Upk_handle2.jpg
scalable
Since the Mosfets are rated at 80A it is theoretically possible to drive it with up to 4 MPPT20s, what means up to 1.6 KWp PV-panels. In practice we maybe better go with 3 MPPT20s and 60A to stay comfortable under the Mosfets limits equal to 1.2KWp PV. Optimum loading is with 3/10C that means with 60A LiFePO4 cells with 200Ah fit perfectly, if you want to reach a lifetime of about 8000 full-cycles (~ 20 calender-years)
This means to construct a backplane for the MPPTs, which consists of the CAN-bus data-lines (blue) and two 12V-Power-lines (black and red) like in this diagramm: https://wiki.opensourceecology.de/images/e/e8/Bms12v_systemuebersicht.png
@case06
can you open the zip file and import it in FreeCAD. Somehow i can't import it correctly in my FreeCAD version (0.16).
thank you in advance
@FWdesign Feedback:
When i imported the .igs file into freecad 0.17 it became extremely slow ... like swapping. Then i changed the view of the whole object into transparent and the performance was normal.
So i saved it into a freecad file
with transparent view.
see
@FWdesign weight of batteries. 1.9 kg per cell. So for the 4 cells it is round about 8kg ( exactly 7,6kg). here you find the specs http://evwest.com/support/CAM72FI%20Final.pdf
@case06 @jocogergely @DhavalGambhava hello CAD designer :) we need a new battery holder for this box design. the batteries lie horizontal. so we need again a mounting option and the space holder. no prio. thank you
in this issue we want to discuss about possible design elements for the batteries and electric components. based on the V0.1 of the Libre Solar Box.
requirements: