<?xml version="1.0" encoding="UTF-8"?><rss xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:atom="http://www.w3.org/2005/Atom" version="2.0"><channel><title><![CDATA[General Discussion]]></title><description><![CDATA[General discussion for the Flow Battery Research Collective]]></description><link>https://fbrc.nodebb.com/category/2</link><generator>RSS for Node</generator><lastBuildDate>Fri, 07 Aug 2026 21:16:01 GMT</lastBuildDate><atom:link href="https://fbrc.nodebb.com/category/2.rss" rel="self" type="application/rss+xml"/><pubDate>Fri, 31 Jul 2026 16:53:13 GMT</pubDate><ttl>60</ttl><item><title><![CDATA[New version of development kit]]></title><link>https://fbrc.nodebb.com/topic/72/new-version-of-development-kit</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/72/new-version-of-development-kit</guid><pubDate>Fri, 31 Jul 2026 16:53:13 GMT</pubDate></item><item><title><![CDATA[New MYSTAT software v1.2.2]]></title><link>https://fbrc.nodebb.com/topic/71/new-mystat-software-v1.2.2</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/71/new-mystat-software-v1.2.2</guid><pubDate>Tue, 28 Jul 2026 16:27:50 GMT</pubDate></item><item><title><![CDATA[Anyone have any questions for the flow battery industry players?]]></title><description><![CDATA[@bipolaron @kirk This project in Switzerland is currently building a 2.1 GWh capacity / 1.2 GW output redox-flow battery. Scheduled to go online in 2029, and by their own PR material "the largest in the world".  https://www.swissinfo.ch/eng/climate-solutions/switzerland-builds-worlds-most-powerful-redox-flow-battery/91181119]]></description><link>https://fbrc.nodebb.com/topic/dedbdf2a-aa9f-414b-bc5b-41cbb5b2a557/anyone-have-any-questions-for-the-flow-battery-industry-players</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/dedbdf2a-aa9f-414b-bc5b-41cbb5b2a557/anyone-have-any-questions-for-the-flow-battery-industry-players</guid><dc:creator><![CDATA[[[global:guest]]]]></dc:creator><pubDate>Tue, 16 Jun 2026 07:10:59 GMT</pubDate></item><item><title><![CDATA[Made a video on FBRC]]></title><description><![CDATA[I caught the version on YT, but having the same vid on PT is great. 
]]></description><link>https://fbrc.nodebb.com/topic/70/made-a-video-on-fbrc</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/70/made-a-video-on-fbrc</guid><dc:creator><![CDATA[BillySmith]]></dc:creator><pubDate>Thu, 21 May 2026 01:17:53 GMT</pubDate></item><item><title><![CDATA[Video on Edison battery]]></title><description><![CDATA[The battery looks interesting but has some problems. From what I've read, it tends to use up the water in the electrolyte fairly quick by splitting into hydrogen and oxygen. Also, It's working voltage is ~1.2v but it needs 1.6v (1.65v if added lithium) to take a change? The inverter I'm leaning towards now, GTIL2000, for low cost and simple connection has an input range of 45v-90v. When using a 48v LFoP battery, it only can produce about 1300w. With a 72v, it's around 1700w according post on a solar forum. One of these batteries with enough sells to put the charge voltage just below 90v with give me a battery that only has about 60v when no solar to charge it. That would really cripple the inverter.
Here is a few videos of someone messing with this battery making his own electrodes and a gell electrolyte in an effort to improve the battery.
https://www.youtube.com/watch?v=NaOzDt83XWY
https://www.youtube.com/watch?v=0mYaei0O1sU
https://www.youtube.com/watch?v=pjoxC4kwA9I
]]></description><link>https://fbrc.nodebb.com/topic/68/video-on-edison-battery</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/68/video-on-edison-battery</guid><dc:creator><![CDATA[Vorg]]></dc:creator><pubDate>Sun, 03 May 2026 07:57:06 GMT</pubDate></item><item><title><![CDATA[MYSTAT software v1.2.1]]></title><link>https://fbrc.nodebb.com/topic/67/mystat-software-v1.2.1</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/67/mystat-software-v1.2.1</guid><pubDate>Sat, 02 May 2026 07:52:15 GMT</pubDate></item><item><title><![CDATA[New video of cell testing process]]></title><link>https://fbrc.nodebb.com/topic/66/new-video-of-cell-testing-process</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/66/new-video-of-cell-testing-process</guid><pubDate>Thu, 26 Mar 2026 12:59:43 GMT</pubDate></item><item><title><![CDATA[Build-a-Batt - A fully parameterized flow cell stack model]]></title><description><![CDATA[Also, this reminds me of the OpenAFPM project - they also use FreeCAD and provide a dashboard for people to input custom parameters for a small wind turbine generator, there is some FEM, and then design files are output. There is a video demo here: https://www.openafpm.net/cad-visualization
I know a few of the folks behind that project, I'm sure they'd be happy to give input on how to accomplish a similar goal but for flow batteries.
]]></description><link>https://fbrc.nodebb.com/topic/65/build-a-batt-a-fully-parameterized-flow-cell-stack-model</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/65/build-a-batt-a-fully-parameterized-flow-cell-stack-model</guid><dc:creator><![CDATA[kirk]]></dc:creator><pubDate>Fri, 13 Mar 2026 05:57:11 GMT</pubDate></item><item><title><![CDATA[Calcium-ion Battery]]></title><description><![CDATA[This video seems to be AI generated and doesn't have that much real information? I have seen Ca-ion systems from (I think) a German group that looked good, but had a lot of organic synthetic steps if I remember correctly.
]]></description><link>https://fbrc.nodebb.com/topic/64/calcium-ion-battery</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/64/calcium-ion-battery</guid><dc:creator><![CDATA[kirk]]></dc:creator><pubDate>Sat, 28 Feb 2026 23:29:44 GMT</pubDate></item><item><title><![CDATA[No pump flow battery, likely not useful, but interesting]]></title><description><![CDATA[https://www.youtube.com/watch?v=t09aBKUejSs&amp;list=PLYDTEjzfnaSVHeUiCOX5Z9G7i_AiSifpR&amp;index=10
]]></description><link>https://fbrc.nodebb.com/topic/63/no-pump-flow-battery-likely-not-useful-but-interesting</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/63/no-pump-flow-battery-likely-not-useful-but-interesting</guid><dc:creator><![CDATA[Vorg]]></dc:creator><pubDate>Mon, 23 Feb 2026 18:00:13 GMT</pubDate></item><item><title><![CDATA[You Tuber Video on an open source all Iron battery]]></title><description><![CDATA[The cost per kWh of this is too high, the use of organic materials and ion exchange membranes puts this closer to what people do in academia and further from the cells that can be reasonably fabricated using DIY approaches. The use of an ion exchange membrane likely reduces the lifetime of this cell a lot. For a static cell, I think the sulfuric acid Cu/Mn battery we have discussed before is far more promising. That chemistry requires no exchange membranes, uses only commodity inorganic materials and cycles to 30-40Wh/L.
For pure Fe batteries I am much more inclined to the Fe flow batteries.
]]></description><link>https://fbrc.nodebb.com/topic/62/you-tuber-video-on-an-open-source-all-iron-battery</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/62/you-tuber-video-on-an-open-source-all-iron-battery</guid><dc:creator><![CDATA[danielfp248]]></dc:creator><pubDate>Sun, 22 Feb 2026 04:39:28 GMT</pubDate></item><item><title><![CDATA[My Suction Luer Lock]]></title><description><![CDATA[Very nice work @doho ! It's great to see your setup.
@doho said in My Suction Luer Lock:

But for getting reproducible resultants the flow through the cell should be down to up, but not horizontal (how much would be air isolating in the chamber when changing parts?)

This is a good point, from what I've seen in other applications cells should generally clear air/produced gases by flowing against gravity from bottom to top, that is still possible with the new setup but the tubing from the pump outlet to cell inlet would have to be slightly longer. In my jig redesign I'll take this into account when writing the documentation.
]]></description><link>https://fbrc.nodebb.com/topic/60/my-suction-luer-lock</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/60/my-suction-luer-lock</guid><dc:creator><![CDATA[kirk]]></dc:creator><pubDate>Thu, 19 Feb 2026 15:45:16 GMT</pubDate></item><item><title><![CDATA[Upcoming improvements to the dev kit]]></title><description><![CDATA[@doho said in Upcoming improvements to the dev kit:

I have try-ed to download Your new files from github (.stl and .pdf), but the files all appeared as broken, even in github.

The files to sprint for the new endplates are here: https://codeberg.org/FBRC/RFB-dev-kit/src/branch/clampable-cell/CAD/exports
[image: 1771858819246-1c46bc80-7e99-4780-8178-46d24a289a32-image.png]
I haven't updated the new
You have to download them individually, unless you clone the repository with Git LFS set up---the large CAD files are handled with LFS and without LFS installed downloading the repository just downlaods a pointer/reference to the CAD file, not the actual file (at least that's how I understand it).
Let me know if this works for you!
]]></description><link>https://fbrc.nodebb.com/topic/59/upcoming-improvements-to-the-dev-kit</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/59/upcoming-improvements-to-the-dev-kit</guid><dc:creator><![CDATA[kirk]]></dc:creator><pubDate>Wed, 18 Feb 2026 12:11:36 GMT</pubDate></item><item><title><![CDATA[Using cnc router cut PVC foam boards as cell frame]]></title><description><![CDATA[@rowow said in Using cnc router cut PVC foam boards as cell frame:

The long term goal and my personal next goal is to get into injection molding which of course is the best option.

At scale, definitely!
@rowow said in Using cnc router cut PVC foam boards as cell frame:

Ill see about uploading the cell fusion 360 model

A .step file would also be great so I could look at it in FreeCAD! I don't have a Fusion 360 license. I'd be curious to see if we could take a similar approach.
]]></description><link>https://fbrc.nodebb.com/topic/58/using-cnc-router-cut-pvc-foam-boards-as-cell-frame</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/58/using-cnc-router-cut-pvc-foam-boards-as-cell-frame</guid><dc:creator><![CDATA[kirk]]></dc:creator><pubDate>Wed, 18 Feb 2026 11:42:55 GMT</pubDate></item><item><title><![CDATA[Preprint from Forner-Cuenca group: RfbFoam: An open-source framework for porous electrode modeling in redox flow batteries]]></title><link>https://fbrc.nodebb.com/topic/56/preprint-from-forner-cuenca-group-rfbfoam-an-open-source-framework-for-porous-electrode-modeling-in-redox-flow-batteries</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/56/preprint-from-forner-cuenca-group-rfbfoam-an-open-source-framework-for-porous-electrode-modeling-in-redox-flow-batteries</guid><pubDate>Sat, 07 Feb 2026 15:17:23 GMT</pubDate></item><item><title><![CDATA[Life Cycle Assessment (LCA) for the FBRC redox-flow battery]]></title><description><![CDATA[Hi all, and apologies for the delay! This year has started off with quite a lot of administrative burden for me and I haven't had as much time for research as I anticipated.
@Santiago-Eduardo said in Life Cycle Assessment (LCA) for the FBRC redox-flow battery:

Elektrolyte:
The group noticed that two slightly different electrolyte compositions are mentioned.

Sorry for the confusion, the correct mass composition can be found in the documentation here: https://fbrc.codeberg.page/rfb-dev-kit/electrolyte.html, the masses listed will prepare approximately 10 mL of electrolyte.
@Santiago-Eduardo said in Life Cycle Assessment (LCA) for the FBRC redox-flow battery:

They assume an 880 ml volume for one single cell. Do you estimate this volume to maintain the obtained results until now? Is this the volume foreseen to achieve the 22 Wh/single large-format cell?

Yes this would be correct volume scaling for the large-format cell, although of course still a lot smaller than an eventual life-size system! It is basically t]e volume that we will end up using for our tests of the large-format cell (still to come).
@Santiago-Eduardo said in Life Cycle Assessment (LCA) for the FBRC redox-flow battery:

The group is assuming the EE value to estimate this. This value does not include energy demand from pumps and electronics, correct?

Correct, these losses are often summed up in RFB literature as "balance-of-plant" or BoP if you want to search for some values.
@Santiago-Eduardo said in Life Cycle Assessment (LCA) for the FBRC redox-flow battery:

Meaning: to store 1 Wh, 1.56 Wh needs to be taken from the grid (excluding electronics and pumps). Does this make sense, or are we oversimplifying here?

You've got it exactly!
@Santiago-Eduardo said in Life Cycle Assessment (LCA) for the FBRC redox-flow battery:

Used electricity
For the same purpose of modelling the use phase, it is important to define from which country and what type of energy/electricity is being used to charge the electrolyte. Since the users of the FBRC battery can be anywhere, but are currently mostly centered in Europe, the group has decided to choose the European electricity grid mix data to represent the current FBRC reality.

This makes sense to me.
@Santiago-Eduardo said in Life Cycle Assessment (LCA) for the FBRC redox-flow battery:

The separator, for instance, would be one of these peripheral impacts, since it would need to be replaced after some cycles (probably faster than the electrolyte). Since cycle durability of photo paper is still unknown, the group will model different scenarios from 10–100 cycles in steps of 30 cycles. Do you feel this is a reasonable range? Do you already now conditions such as density and flow rate the larger cell will work with? The group will assume 4 layers for the larger cell although in some parts are 3 layers stated.

While separators can be replaced, I am doubtful in an industrial system that they would, due to the labor costs. From my understanding, Li-ion lifetimes are often given as 2,000 cycles to 80% of initial capacity; for flow batteries, the data isn't as solid, but for VRFB the lifetime claims are more on the scale of 20,000 cycles or 20 years, whichever comes sooner (taken with a grain of salt...). We haven't done any testing that long-term, so don't have much for your to extrapolate, but RFB technoeconomic papers with operation and maintenance (O&amp;M) costs incorporated would give you a good idea of membrane/pump replacement
frequency (if ever). I would increase the cycle range to much longer terms, with the upper end in the 1,000s at least.
We aren't yet locked-in on flow rates for the large cell as we are still settling on choice of pumps and flow field design.
@Santiago-Eduardo said in Life Cycle Assessment (LCA) for the FBRC redox-flow battery:

The current BOM and building instructions do not provide specific links to purchase the necessary chemicals. To model the electrolyte production, including the transportation of each chemical, the group has assumed the following production locations based on market data and worldwide production trends. If your own experience differs in this, please do not hesitate to comment.

These assumptions all make sense to me; Daramic separator (which we also use in addition to paper depending on the test) can/is produced in the EU though not exclusively.
I hope this clears things up for you all somewhat, and again, sorry for the delay!
]]></description><link>https://fbrc.nodebb.com/topic/53/life-cycle-assessment-lca-for-the-fbrc-redox-flow-battery</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/53/life-cycle-assessment-lca-for-the-fbrc-redox-flow-battery</guid><dc:creator><![CDATA[kirk]]></dc:creator><pubDate>Mon, 01 Dec 2025 21:54:23 GMT</pubDate></item><item><title><![CDATA[MyStat control software refactor]]></title><description><![CDATA[Hi sepi, your refactor-modular works on my PCs: my mainPC (Kubuntut 2404) and two Notebooks for measurements (Kubuntu 2404 and Win11), thanks.
I'm waiting for your calibration wizard. My hardware is waiting incl. Mystat, but till now I did not do tests.
]]></description><link>https://fbrc.nodebb.com/topic/52/mystat-control-software-refactor</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/52/mystat-control-software-refactor</guid><dc:creator><![CDATA[doho]]></dc:creator><pubDate>Fri, 14 Nov 2025 20:10:17 GMT</pubDate></item><item><title><![CDATA[Youtube Video from Undecided has some interesting new info on Zinc batteries]]></title><description><![CDATA[from this paper, seems like nanomaterial synthesis needed: https://www.nature.com/articles/s41560-026-02091-w#Sec25
also they use triflate salts --- that's likely more expensive than the Zn (and, fluorine-containing, with all that entails)
]]></description><link>https://fbrc.nodebb.com/topic/50/youtube-video-from-undecided-has-some-interesting-new-info-on-zinc-batteries</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/50/youtube-video-from-undecided-has-some-interesting-new-info-on-zinc-batteries</guid><dc:creator><![CDATA[kirk]]></dc:creator><pubDate>Tue, 14 Oct 2025 17:54:39 GMT</pubDate></item><item><title><![CDATA[3D printed barbed connector]]></title><description><![CDATA[My pumps didn't have them, only the ones built into the pump. I saw that on some of your pictures, you have additional fittings between the different elements, I guess to make it easier to connect and disconnect the cell. In the end, it might make more sense to just shrink the barbs on the flowframe and/or tank a bit so the tubing comes off mor easily.
]]></description><link>https://fbrc.nodebb.com/topic/45/3d-printed-barbed-connector</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/45/3d-printed-barbed-connector</guid><dc:creator><![CDATA[sepi]]></dc:creator><pubDate>Thu, 11 Sep 2025 17:49:16 GMT</pubDate></item><item><title><![CDATA[Thin sleeves to insulate screws (no more tape)]]></title><description><![CDATA[@doho that's a great idea, I'll give it a try!
]]></description><link>https://fbrc.nodebb.com/topic/43/thin-sleeves-to-insulate-screws-no-more-tape</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/43/thin-sleeves-to-insulate-screws-no-more-tape</guid><dc:creator><![CDATA[sepi]]></dc:creator><pubDate>Mon, 01 Sep 2025 08:34:55 GMT</pubDate></item><item><title><![CDATA[Separator material]]></title><description><![CDATA[@danielfp248 ah, that makes sense as a last resort measure but would it not be nice to not lose charge? Well it all depends on how easiy it is to counteract by setting a different flow for the different electrolytes.
]]></description><link>https://fbrc.nodebb.com/topic/41/separator-material</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/41/separator-material</guid><dc:creator><![CDATA[sepi]]></dc:creator><pubDate>Wed, 20 Aug 2025 14:20:09 GMT</pubDate></item><item><title><![CDATA[Tygon chemical for sale]]></title><description><![CDATA[The tubing is gone now, thanks for buying at my store 
]]></description><link>https://fbrc.nodebb.com/topic/40/tygon-chemical-for-sale</link><guid isPermaLink="true">https://fbrc.nodebb.com/topic/40/tygon-chemical-for-sale</guid><dc:creator><![CDATA[sepi]]></dc:creator><pubDate>Tue, 19 Aug 2025 18:40:48 GMT</pubDate></item></channel></rss>