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  1. upnorthandpersonal

    Heater element matched to solar panel output = diode string

    Hot water tanks n this case are several thousand liters. They're buffers hooked up to e.g. wood burners, and they have extra electric heating elements. These buffers are both for domestic hot water as well as the floor heating. When adding them directly to the house, you need a grid tie...
  2. upnorthandpersonal

    Heater element matched to solar panel output = diode string

    Not built it yet (no time). I have the PCBs which Steve sent me, the list of components etc. are here: https://drive.google.com/drive/u/1/folders/1ZttKfq6gq9EcfazIHo1u6NbJQLIiO2CD
  3. upnorthandpersonal

    Dead short fuse trip experiment using an MRBF fuse

    I wish I had more time. I have all the equipment to do these tests in my lab (I've done Class T and BS88 in the past for example). As for the BMS (I tested the JK): in many cases and faults it will be much faster to react than the fuse, but it's not the only thing I would rely on. I size my...
  4. upnorthandpersonal

    JK-BMS-CAN with new Cut-Off Charging Logic (open-source)

    I'll follow the thread. I know it can be frustrating on either end, but @chaosnature, you have to remember everyone is trying to help out here and remember that the others only have the information you share to do so. This has nothing to do with 'negative attitudes', and is not a 'you are either...
  5. upnorthandpersonal

    Air gap for heat to escape?

    @sunshine_eggo ^ another one of your kind :)
  6. upnorthandpersonal

    I'm Pretty Sure This Is What My Wife Hears When I Talk About This Stuff

    That's old news though. The original machine has a base-plate of prefabulated aluminite, surmounted by a malleable logarithmic casing in such a way that the two main spurving bearings were in a direct line with the pentametric fan. The latter consisted simply of six hydrocoptic marzlevanes, so...
  7. upnorthandpersonal

    Solar assistant: do you use it?

    Excuse me, sir. Seeing as how the VP is such a VIP, shouldn't we keep the PC on the QT? 'Cause if it leaks to the VC he could end up MIA, and then we'd all be put on KP. - Adrian Cronauer
  8. upnorthandpersonal

    Air gap for heat to escape?

    You have no idea, but you're in for something :)
  9. upnorthandpersonal

    Air gap for heat to escape?

    PIR doesn't burn easily. It will turn black, but it's not at all like Styrofoam.
  10. upnorthandpersonal

    Solar assistant: do you use it?

    Yep. I use a more 'bare metal' approach consisting of Grafana for the user/monitoring interface and bunch of Python code that controls things like Shelly devices, the heatpump (dumping excess when battery is over 80% or so, also depending on weather forecast data, etc.), pings me when the wood...
  11. upnorthandpersonal

    Air gap for heat to escape?

    Not OP, but PIR is excellent for this. Something like Finnfoam FF-PIR. I made a calculation in the past: https://diysolarforum.com/threads/lifepo4-heating-pads-circuit-design-question-diagram-relay-to-relay.50493/#post-642059 You can adapt that to your box dimensions and temperatures. Also...
  12. upnorthandpersonal

    My 44kW vertical and bifacial set in Finland.

    Nah, those are marshmallows - ready to harvest I believe.
  13. upnorthandpersonal

    Deciding to DIY my solar battery was one of my worst mistakes ever

    The local university where I also teach has the largest Arcade and Pinball collection in Finland. https://yle.fi/a/74-20023534 Article in Finnish, but you can translate...
  14. upnorthandpersonal

    Deciding to DIY my solar battery was one of my worst mistakes ever

    One of my hobbies is restoring old arcade machines. I know all about those caps and coin cell batteries...
  15. upnorthandpersonal

    Deciding to DIY my solar battery was one of my worst mistakes ever

    If you ever had a Phase 5 accelerator, I personally know the engineers behind that company. Still got a A600 and A1200 somewhere, and I think I even have a PowerPC accelerator for the A1200, and I also should have a VLab Motion non-linear video editing card and a bunch of other stuff. I was into...
  16. upnorthandpersonal

    Cell price drop

    And still, cell prices are still dropping here in the EU.
  17. upnorthandpersonal

    Cross-checking my ideas for my Battery v2 after Battery v1 Nighmare

    Think about Andy's garage in sunny hot Australia. They see 35C for sure in his cabinet. It's not about self-heating (LFP has a very efficient round trip), it's more about ambient over 30C which many people not in our Nordic region face for long periods of time during a year.
  18. upnorthandpersonal

    Cross-checking my ideas for my Battery v2 after Battery v1 Nighmare

    Yep - at cold temps, the battery limits charge current itself due to increasing internal resistance. No such limiting at high temps.
  19. upnorthandpersonal

    Battery charger efficiency?

    For reference, a R48 Rectifier (as some of us use in our DIY chargeverter) sits over 90% efficiency.
  20. upnorthandpersonal

    Small diesel generator...

    See if you can find some military surplus equipment. Tends to be cheaper and some of the older stuff is easier to fix/rebuild if something goes wrong. Just make sure it's not a 400Hz thing.
  21. upnorthandpersonal

    Deciding to DIY my solar battery was one of my worst mistakes ever

    But also think about the opportunities it can bring, when you invest time into this and become good at it and how valuable that knowledge can be. Because I started doing this, I've been able to join projects I wouldn't have been able to otherwise. I'm currently designing a battery pack for a...
  22. upnorthandpersonal

    Deciding to DIY my solar battery was one of my worst mistakes ever

    Yep, that's mine. I think I mention somewhere that those nuts are hand-tight. Nothing. You can get to 50% of the price of off-the-shelf by going DIY, and have been for pretty much ever. The last time I made the calculation...
  23. upnorthandpersonal

    Victron is Over-priced Eurotrash. Why would anybody buy Victron over an AiO?

    Inverters 101 There are a few ways to make an AC voltage out of a DC source. Traditionally, these are (skipping modified sine wave) low and high frequency inverters. The traditional low frequency inverter uses a power stage that uses a ferroresonant transformer, but these are not used in...
  24. upnorthandpersonal

    JKBms not accurate

    That's not the actual JK site, but the one that is the actual site (jkbms.net) seems to have issues. @Nami ?
  25. upnorthandpersonal

    How to update communication protocol of a battery BMS?

    Do you have any examples? It's only with inverter style BMS that can support a variety of protocols (over CAN or Modbus/RS485) and you can choose one in the configuration. This allows integration with e.g. Victron, supporting the Pylontech protocol, etc.
  26. upnorthandpersonal

    Sodium ion batteries vs LiFePO4

    Andy did some NaI charge/discharge tests and looks at possible cut-off voltages and capacity remaining:
  27. upnorthandpersonal

    JK-BMS-CAN with new Cut-Off Charging Logic (open-source)

    This is correct. At low temperatures, the increased internal resistance will automatically prevent high C rates.
  28. upnorthandpersonal

    Build a LiFePO4 battery or buy one already made?

    For cells in Europe, go with e.g. NKON in The Netherlands.
  29. upnorthandpersonal

    Build a LiFePO4 battery or buy one already made?

    Be careful with buying cells from Aliexpress. Many of the listings there are plain scams, and a lot of other sellers are less than honest to say it mildly. Aliexpress is good for many things, but battery cells aren't one of them.
  30. upnorthandpersonal

    Battery price drop?

    There are always trade-offs. NaI cell voltage is not the same as LFP cell voltage, so if you want to do 0% - 100%, that means 1.5V to 3.95V. Not a lot of inverters that can work within that voltage range (24V - 63.2V for a '48V' pack). You can stay away from these and say use them between 2.5V...
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