Voltaic Medium Enclosure Station G2 / BCPB2 Bracket

Capacity Notes

I don't recommend running using this configuration in its current form. The capacity of 3Ah cells in the BCPB2 is only enough to run the G2 for about 3 days without sunlight. If this is acceptable to you then feel free to use the bracket. But I am not planning to continue using this setup outside and am looking to build a new solution with a larger battery (like a 3S2P or 3S3P).

Details

A bracket for the Voltaic Medium enclosure which allows you to mount a Wondom BCPB2, Station G2, and optional Adafruit INA219 and BME680 STEMMA QT sensors.

You will need some screws in addition to the ones that came with the Voltaic enclosure:

• 4 x M3 (between 5 and 10mm) for the BCPB2
• 6 x M3 (between 8 and 12mm) for the Station G2
• 4 x screws from the original Voltaic enclosure mount plates for the STEMMA QT sensors if using those
• 6 x M2.5 (8mm or 10mm with use of included printable washers so they don't bottom out) for the bracket to the case standoffs. You can print the "Washer Included" versions to included the washer on the print if you prefer.

In addition to the screws you will also need some very flexible LMR-195 (Time Microwave UltraFlex or other stranded center conductor) and a 90-degree SMA adapter. This is to make the tight bend through the cable gland to the SMA connector on the Station G2. I am using ABR195W-UF from https://abrind.com/cable-overview-abr195w-uf-pn195wf.

The power cable from the BCPB2 to Station G2 was custom made by me. You can pick up a JST PH 2mm 4 conductor lead (which also comes with the BCPB2 cable kit if you get that) and a JST ZH 1.5mm 5 conductor lead to make your own. Be mindful of the positive and negative leads on both as the leads usually come without color-coding.

Print in PETG or better outdoor rated plastic if you'll be using it in an outdoor setting. I also did 3 perimeters and 30% rectilinear infill.

Source CAD model at https://cad.onshape.com/documents/c2e16016d1bf436de06357a8/v/e601e597ea965b6cfd7806ec/e/8e2e3b747916a44ee6a2bb00?renderMode=0&uiState=66cf7d56e174fa7caf5bb941

Updates

• 09/22/24 V2: Changed the geometry around the SMA connector a bit to make it easier to screw in. Moved the G2 to the right a little bit to also help with this. The LMR-240 was a bit too stiff so I changed the instructions to mention only LMR-195 stranded flexible.
• 11/24/24 V3: Added a configuration for the new INA3221 STEMMA QT power board with 3 channels. Also added versions with the builtin washer on the corners. Be sure to choose the right bracket for the sensor and length screw you intend to use!