@sepi Thanks for sharing! Those silicone gaskets look great, I've manually cut gaskets that worked in the past and to be honest they didn't look half as good as yours do, so I bet they will work just fine. Good point on the Arduino button, it also didn't work on my Chinese Arduino clone, we need to modify that STL to make the button deeper.

@gus now that you have it working. Do you have any ideas how to take this further?

@sepi The pharMed BPT is not the correct tubing. It will work for a while but will slowly leak iodine at high SOC values (especially above 50% SOC). You should order the teflon lined one explicitly, they refer to it as "tygon chemical tubing". Make sure to confirm they are sending you PTFE lines tubing. As I mentioned they do NOT sell this through aliexpress so you will need to contact them directly. Note that you can still run tests at lower SOC values with normal BPT tubing.

If it's solid wood, there is a high chance that it will warp with changes in temperature and/or humidity. I guess it is some kind of plywood made from birch wood. Plywood is much less prone to warping due to the aforementionned external factors. In the end things might be different since the plates will be under pressure. I'm wondering if a structure a bit similar to what you did for the PLA endplates in the small battery might work. That's off course only if you run into trouble with your current, simple design.

@quinnale this look great!! @quinnale said in Towards a working system: In addition, by printing the gasket template for a guide, and then cutting the holes and cavity with some cheap circular punches and an x-acto knife, I got some jenky gaskets. I've done similar, it's definitely possible as you've shown! @quinnale said in Towards a working system: Also, should I have made this a blog post? Happy to delete and move if that's better. Oh no worries there, I made that category in part as a container for Daniel's blog - WordPress and our forum software can interact (via ActivityPub), so that we can reference and comment on his (and other people's) longform WordPress posts directly here in the forum, like what's happening here. @quinnale said in Towards a working system: Also, here's an update on the 3D-printed pump! Been running it for about an hour, no issues. Unlisted Youtube video . If anyone is curious I can provide more details. Gonna try run it to death, see if the plastic or the tubing fails first. That's awesome! Having another pump option besides only Kamoer would be great (esp. an open-source one!). It's this pump you've used? @sepi said in Towards a working system: eing a complete newb, I slowly gather an understanding of the individual components of the cell. Glad to hear it, that's one of the whole points of this forum!

Ah, in the FAQ ... Yes, was thinking wrong from other and not so good sources.

@sepi Unless you are very experienced soldering small components I would suggest not doing this. Some of the expensive components are tiny and easy to damage, either by overheating or by soldering multiple legs together and causing shorts. I tried soldering my own mystat 3 times (without success) before I got my first working one from pcbway. I am however, not good at all at soldering.

My latest quote is 315$ with assembly included by PCBWay. That's expensive but not prohibitive. Thanks for the input!

Here is an updated version! https://spectra.video/w/nJ8XNYu1MXNPSDLKV3KVTh

@gus @SamAuc ABS may work with an all-copper chemistry!

Cloning the https://codeberg.org/FBRC/RFB-dev-kit repository, opening the assembly in FreeCAD, fixing part of it, then pushing the changes with VSCodium. As part of the Flow Battery Research Collective project at https://fbrc.dev 0:00 Cloning repository 3:29 Opening assembly file 4:09 Fixing the cell assembly 20:20 Pushing changes to repository

Hi Otmar, welcome to FBRC and the project, looking forward to working with you!

@kirk said in How should we control the centrifugal pumps? TRIAC/thyristor etc? Need help from controls/electrical people: It seems to work! At least enough for testing purposes. Here is a video: https://spectra.video/w/8xipM8aXnBkDXnu4kkRpqT Here is the code for this test: https://codeberg.org/FBRC/RFB-test-cell/src/commit/d10834bc7dd67736e708c9a33832a5602ab3ca28/firmware/FlowrateRampTest.ino

That's great! Do you have a link to one or know where we could procure one to test?

Stephen Hawes of Opulo has compiled some of their tools here: https://midscale.io/docs The AutoBOM one seems to be based on those workflows above and looks pretty interesting

Reading the posts about the different pump designs, it makes more sense. More background reading to do. TY