| - wiedi (QUIT: Ping timeout: 256 seconds) (~wiedi@ip5b4096a6.dynamic.kabel-deutschland.de) | 00:05 | |
| ex-parrot | mntmn: that should be fine | 00:21 |
|---|---|---|
| mntmn | ex-parrot: ok | 00:27 |
| ex-parrot | and a reasonable proportion of the time the govt just choses not to charge import tax | 00:28 |
| ex-parrot | so who knows :) | 00:28 |
| + terpri_ (~terpri@2606-a000-1127-8381-bb9b-06b0-c48b-b828.inf6.spectrum.com) | 00:37 | |
| - terpri (QUIT: Ping timeout: 260 seconds) (~terpri@2606-a000-1127-8381-bb9b-06b0-c48b-b828.inf6.spectrum.com) | 00:41 | |
| - jfred (QUIT: Quit: The Lounge - https://thelounge.chat) (~jfred@li652-25.members.linode.com) | 00:59 | |
| - csprng (QUIT: Ping timeout: 240 seconds) (~sprang@h72-0-167-252.bendor.broadband.dynamic.tds.net) | 01:28 | |
| + csprng (~sprang@h72-0-167-252.bendor.broadband.dynamic.tds.net) | 01:30 | |
| + terpri__ (~terpri@2606-a000-1127-8381-bb9b-06b0-c48b-b828.inf6.spectrum.com) | 02:13 | |
| - terpri_ (QUIT: Ping timeout: 260 seconds) (~terpri@2606-a000-1127-8381-bb9b-06b0-c48b-b828.inf6.spectrum.com) | 02:16 | |
| + B[] (~Thunderbi@219-89-228-78-adsl.sparkbb.co.nz) | 02:37 | |
| Jookia | mntmn: do you have any information on prolonging lifepo4 battery life? cycling between 20% and 80% seems to be suggested for traditional lipo cells | 03:04 |
| mntmn | i read a bit about it, but it’s unconclusive because it’s hard to tell which technology generation you’re dealing with | 03:05 |
| mntmn | anyway it’s not so good to fully discharge | 03:05 |
| mntmn | and it’s not so good to keep charging at the top. so better stop when full. i just implemented a safety for that today. | 03:06 |
| Jookia | what about fully charging? | 03:06 |
| mntmn | full charge is ok but apparently no trickle charging because lifepo4 keep the charge very well | 03:06 |
| mntmn | like, they have almost no self discharge | 03:07 |
| mntmn | apparently freezing them is bad | 03:07 |
| mntmn | and cells shouldn’t be too hot | 03:07 |
| mntmn | they don’t get hot by themselves though | 03:07 |
| mntmn | unlike liion | 03:07 |
| Jookia | does the reform have some kind of charge window? like between 20% and 80% | 03:07 |
| mntmn | more like 20% and 100% | 03:08 |
| mntmn | i could go lower but in my experiments it can be bad | 03:08 |
| Jookia | so 100% charge on lifepo4 isn't the same terribleness as liion? | 03:08 |
| mntmn | like, going below 2.5V is not so healthy i think | 03:08 |
| mntmn | no, it’s not terrible afaik | 03:09 |
| Jookia | ah ok | 03:09 |
| mntmn | i mean i’ve revived cells that were at 1V | 03:09 |
| mntmn | but if they go lower they don’t keep much charge anymore | 03:09 |
| mntmn | like, they can take damage at the low end | 03:09 |
| mntmn | also they shouldn’t be tortured with high voltage | 03:10 |
| mntmn | some people charge with up to 3.9v or more but i don’t do that | 03:10 |
| Jookia | isn't 3.4 around 98%? | 03:11 |
| mntmn | i start balancing (discharge) at around 3.5-3.6 | 03:11 |
| mntmn | yeah the voltage is not reliable though | 03:11 |
| mntmn | it changes immediately depending if you load them or charge them | 03:11 |
| Jookia | ah | 03:12 |
| mntmn | but yeah they spend most of the discharge time at 3.2V | 03:12 |
| mntmn | and nominal charging voltage is 3.6 | 03:12 |
| mntmn | you can crank that up a little to charge faster | 03:12 |
| mntmn | but it can be detrimental | 03:12 |
| Jookia | i've been looking at little linear chargers for my project, though i still need to find a battery protection IC for them | 03:13 |
| mntmn | yeah i also don’t have individual cell protection. i use a monitor for all of the cells in parallel and the mcu disconnects the battery input (or stops charging) if there’s a problem | 03:14 |
| mntmn | and i can discharge individual cells | 03:15 |
| mntmn | but i don’t have charge shuttles, active balancing or | 03:15 |
| mntmn | so | 03:15 |
| Jookia | interesting! i'm not doing BMS, just a single cell | 03:15 |
| mntmn | ok | 03:15 |
| mntmn | i also have an analog UVLO that turns off _everything_ if system voltage goes critically low | 03:16 |
| Jookia | that's pretty cool | 03:16 |
| mntmn | like, just a voltage divider on the EN of the standby 3.3v supply for the lpc mcu | 03:16 |
| Jookia | i see | 03:18 |
| ex-parrot | nice idea | 03:36 |
| ex-parrot | overdischarge killed my novena battery :( | 03:36 |
| ex-parrot | and then I could never get a replacement as good in the same form factor | 03:36 |
| - csprng (QUIT: Ping timeout: 260 seconds) (~sprang@h72-0-167-252.bendor.broadband.dynamic.tds.net) | 03:37 | |
| + csprng (~sprang@h72-0-167-252.bendor.broadband.dynamic.tds.net) | 03:39 | |
| Jookia | ex-parrot: :< | 04:10 |
| ex-parrot | oh well, it's how these things go :P | 04:11 |
| - midfavila (QUIT: Ping timeout: 240 seconds) (~midfavila@2607:fea8:e920:5f00::df85) | 04:44 | |
| + wiedi (~wiedi@ip5b4065de.dynamic.kabel-deutschland.de) | 05:01 | |
| * terpri__ -> terpri | 05:34 | |
| swivel | mntmn: what was the battery runtime on the reform 2? | 05:34 |
| - csprng (QUIT: Ping timeout: 246 seconds) (~sprang@h72-0-167-252.bendor.broadband.dynamic.tds.net) | 05:47 | |
| + csprng (~sprang@h72-0-167-252.bendor.broadband.dynamic.tds.net) | 05:49 | |
| - B[] (QUIT: Ping timeout: 264 seconds) (~Thunderbi@219-89-228-78-adsl.sparkbb.co.nz) | 07:51 | |
| - csprng (QUIT: Ping timeout: 246 seconds) (~sprang@h72-0-167-252.bendor.broadband.dynamic.tds.net) | 07:56 | |
| + csprng (~sprang@h72-0-167-252.bendor.broadband.dynamic.tds.net) | 07:58 | |
| - MilkManzJourDadd (QUIT: *.net *.split) (milkmanz1@gateway/shell/matrix.org/x-yehsjydzjnbqaqdw) | 09:10 | |
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| - dckc (QUIT: Ping timeout: 260 seconds) (~DanC@user2.kumc.edu) | 10:04 | |
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| + dckc (~DanC@2605:a601:ac60:1000:20d3:4ffb:581d:f812) | 10:10 | |
| mntmn | swivel: it’s currently around 4-5h | 10:41 |
| + adjtm_ (~adjtm@155.red-79-150-249.dynamicip.rima-tde.net) | 11:09 | |
| - adjtm (QUIT: Ping timeout: 240 seconds) (~adjtm@80.red-79-150-248.dynamicip.rima-tde.net) | 11:11 | |
| - erlehmann (QUIT: Read error: Connection reset by peer) (~erlehmann@46.114.39.139) | 11:54 | |
| + erlehmann (~erlehmann@46.114.32.230) | 12:09 | |
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| + csprng (~sprang@h72-0-167-252.bendor.broadband.dynamic.tds.net) | 12:17 | |
| - jvalleroy (QUIT: Quit: http://quassel-irc.org - Chat comfortably. Anywhere.) (~quassel@unaffiliated/jvalleroy) | 12:43 | |
| + jvalleroy (~quassel@li1266-111.members.linode.com) | 12:44 | |
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| + jvalleroy (~quassel@unaffiliated/jvalleroy) | 12:44 | |
| - _Bnu (QUIT: Read error: Connection reset by peer) (~beeanyew@89-160-120-72.cust.bredband2.com) | 12:49 | |
| - csprng (QUIT: Ping timeout: 265 seconds) (~sprang@h72-0-167-252.bendor.broadband.dynamic.tds.net) | 14:24 | |
| + csprng (~sprang@h72-0-167-252.bendor.broadband.dynamic.tds.net) | 14:26 | |
| skalk | @mntmn: I'm trying to change the u-boot environment persistently:q | 16:00 |
| skalk | unfortunately, certain boot variables are set hardly | 16:01 |
| skalk | always by the code in set_env_vars, so that you cannot change the default bootcmd | 16:01 |
| skalk | as a workaround I compile the network boot command into u-boot | 16:02 |
| skalk | just wanted to give you the feedback that one cannot change it, which is more convenient | 16:03 |
| skalk | but probably most users won't do it anyway, so I think there is no hard need for it | 16:04 |
| - dckc (QUIT: Ping timeout: 240 seconds) (~DanC@2605:a601:ac60:1000:20d3:4ffb:581d:f812) | 16:18 | |
| + dckc (~DanC@user2.kumc.edu) | 16:23 | |
| - csprng (QUIT: Ping timeout: 258 seconds) (~sprang@h72-0-167-252.bendor.broadband.dynamic.tds.net) | 16:33 | |
| + _Bnu- (boll@89-160-120-54.cust.bredband2.com) | 16:34 | |
| + _Bnu (~beeanyew@89-160-120-72.cust.bredband2.com) | 16:35 | |
| + csprng (~sprang@h72-0-167-252.bendor.broadband.dynamic.tds.net) | 16:35 | |
| - _Bnu- (QUIT: Client Quit) (boll@89-160-120-54.cust.bredband2.com) | 16:36 | |
| Jookia | mntmn: does the reform use a specific lifepo4 charger or does it just use a generic lion one? i've been looking at charger ics online and some sites seem to forget to write it on the data sheet but write in on the online search and vice versa | 17:08 |
| Jookia | it kind of just seems that all lithium charger ICs do is pour energy in until it reaches a voltage | 17:11 |
| mntmn | skalk: so far i’ve also just compiled it in. there’s some bug there related to saving on sd-card instead of eMMC. | 17:24 |
| mntmn | skalk: but i still have to clean up u-boot anyway, or ideally move to mainline u-boot, where this should work | 17:25 |
| mntmn | Jookia: last page http://dump.mntmn.com/reform2-motherboard.pdf | 17:26 |
| mntmn | Jookia: i'm using LTC4020 | 17:26 |
| mntmn | which is kind of an expensive, heavy-duty solution ;) | 17:27 |
| mntmn | but very powerful | 17:27 |
| Jookia | i see | 17:28 |
| mntmn | there are also much simpler chips. | 17:28 |
| Jookia | i was looking at the LTC4079 but despite the website search saying it supports lifepo4, the description/data sheet doesn't | 17:29 |
| mntmn | it really depends on your topology? like, how many in series, paralleled, do you need balancing? | 17:29 |
| Jookia | just one 18650 battery, it's basic stuff | 17:29 |
| mntmn | Jookia: MCP73831? | 17:30 |
| Jookia | yeah i have that one listed- but i'd like something that i can configure to work on both at runtime, which i imagine is just setting voltage/current targets over i2c | 17:31 |
| mntmn | ah you want to change chemistry on the fly? | 17:31 |
| Jookia | yeah, or with a switch | 17:32 |
| mntmn | with a switch you could also use 2 simple chargers | 17:32 |
| mntmn | like, one for each chemistry | 17:32 |
| Jookia | that's true, and was my original thought | 17:33 |
| - wiedi (QUIT: Read error: Connection reset by peer) (~wiedi@ip5b4065de.dynamic.kabel-deutschland.de) | 18:31 | |
| + wiedi (~wiedi@ip5b4065de.dynamic.kabel-deutschland.de) | 18:31 | |
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| + erlehmann (~erlehmann@46.114.39.233) | 19:37 | |
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| - futarisIRCcloud (QUIT: Quit: Connection closed for inactivity) (uid222239@gateway/web/irccloud.com/x-eodhcvjhlbyrsjfp) | 20:54 | |
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| - mntmn (QUIT: ) (sid100487@gateway/web/irccloud.com/x-zkzkiykzqvuqciox) | 23:07 | |
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| + mntmn (~mntmn@softboy.mntmn.com) | 23:42 | |
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