That concept is really good but it doesn’t help us that it’s integrated into your drone and can’t be purchased separately. Did you order the BMS with your batch 4? That will communicate individual cell voltage to your controller.
Just to be clear… OpenPPG shows system voltage on the controller. The thing it has been lacking is individual cell voltage which will be part of the batch 4 BMS. I added the alarms for now to let me know if I have a low cell.
Yes i did order the baterymanagement too.
I just thought when the droneguys can build such a system someone here could do it too…
I did read your comments about waiting for batch 4 or trying something right now on your own…
And you are right the lowest cell is the most important…
Why 5000uF vs Paul’s matching 330uF?
Cheers
I soldered a 1/4”-20 brass bolt to an Xt 150 connector. I ran a tap into the connector first because the bolt was slightly too big. After soldering I cut it to the right length. Now the wires bolt directly to the connector with brass nuts (zinc plated nuts shown in the picture but I used brass). Now the connector cover is part of the surface mount holder.
Here are the files:
Xt 150 Mount Black - Face.stl (197.9 KB)
Xt 150 Mount Black - Middle.stl (141.5 KB)
Xt 150 Mount Black - Base.stl (304.1 KB)
Xt 150 Mount Black - Two Wire Cover.stl (293.2 KB)
Xt 150 Mount Black - Three Wire Cover.stl (316.2 KB)
This is the thread with all the links to read>
2 x 330uF Capacitors = 660uF / 220uF for every 4 inch extension of battery cable!
I searched for 7 x 63V 330uF capacitor packs (2310uF) and they are not available, but the
63V 5000uF packs were available and so I bought them. Are they overkill - maybe, but I am on the
safe side.
When I build my batch4 I will use 100A ESC’s and thinking about putting the ESC’s inside with
fan blowers…
Hello Paul,
I want to order a few parts at 3d hubs from your designs…
Is this material/infill/layer height correct?
Thank you for your time…
I ordered the parts in PLA / 100% infill / Layer height 200 in black.
Here are the prices I paid in $ - I will report back how the quality is when I receive them…
I’ve used 3D hub many times for parts for openppg in pla, they turned out well for me.
Dang thats a lot of cash for those, I could print them out for you free plus shipping costs
I edited Paul’s capacitor holder a bit so it could stay bolted to the arm.
Connector Cover - Bottom v2.stl (54.6 KB)
The battery incidents I am familiar with were the result of poor manufacturing quality and quality control systems. In general, Lipo are considered fairly safe from what I’ve read. (more safe than Li-on)
I believe the reason they are so heavily used in EPPG is because they have a very high discharge rate, which is needed to deliver the power PPGs need, and there aren’t many other options out there. Most of the other electric options are far too heavy which would result in increased wing size/drag requiring bigger motors and more batteries.
Someone just posted about the new Aerostak H2 power cells which are designed for aviation… I’m really interested to learn more about that. Previous power cell designs have been far too heavy to be viable… this one’s just going to be really expensive I suspect 
(Entire power cell weighs less than 2lbs… fuel would be another 15lbs or so)
Paul,
I’ve been trying to locate these on Amazon, but can’t find the same size as you used. Do you have an item number? They only have 35 mm that I can find. Thanks.
To clarify, I was referring to post 128 about the rubber grommets used for prop blade protection. I can locate 35 mm and 40 mm, but no 32 mm as shown in your link to Amazon.
Sorry, it looks like those are unavailable now. I had a hard time finding the size I wanted.
Ok, Paul, thanks for that information. I’ll keep looking.
Bill
32mm is 1.25 inch.
Look up
McMaster Carr
Grommet 1.25in.
rubber.
They sell them by the bag.
John
Thanks, John! That’s very helpful, I wasn’t having any luck searching for that size.
It’s been a while since I’ve posted flying videos. I only fly with 6 batteries now and have a new wing which is slightly bigger to handle the weight better. I traded in my medium Tequila 4 and bought a large Tequila 5. Here are some short clips:
Landing sooo smoothe
