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  1. derekisastro

    Considering upgrades, is my math correct?

    I see my original comment on your initial post was far too late. As to load testing the AGM's I wouldn't worry about it. The bigger thing to measure is to get a grasp on your usage. Whether by using a whole panel meter of some kind (Sense is one brand) or individual circuit/outlet load testing...
  2. derekisastro

    Considering upgrades, is my math correct?

    No, this is not correct. Not sure how you did it but it looks like you double 'halved' the LA. 600ah @ 12V (I'll even use the 12.6V nominal for a little more kick) is 7560wh. At a usable DOD of 50%, your usable capacity is 3780wh or 3.78kwh. It looks like you already applied the 50% initially...
  3. derekisastro

    Daly BMS remote monitoring

    I know you've stated on many occasions your inability or lack of desire to put something together that isn't 'off the shelf' but I doubt there is anything off the shelf to do what you want. There is going to be some level of 'putting something together' involved. I personally use Home Assistant...
  4. derekisastro

    Socially negative impacts of solar

    I could be proven wrong but I cannot see that happening in 100 years let alone less than 30. In any sphere of interest, I think many fail to really grasp just how much of the populations of a whole they represent. It's very easy to think, on this forum, that people like us are super common but...
  5. derekisastro

    How to Calibrate Growatt Battery Voltage Offset

    What do the settings 29 to 33 mean? I'm not sure which setting(s) I should be adjusting.
  6. derekisastro

    What triggers Growatt 3000 to exit float and resume bulk charging (via solar)

    To add to my experiences over the last few days, with my battery not powering any loads for some of the time (I just had the battery disconnected from the load side of the system) when going through its daily cycle, with my absorption set to 28.4 and float at 27.8, it would charge daily, with...
  7. derekisastro

    Monitoring software for Growatt-MPP Solar inverters

    I also cannot recommend Solar Assistant enough. It is a fantastic piece of software and just keeps getting better. I currently run 2 Growatt inverters in parallel, with a Daly BMS, and also run Home Assistant. The software virtually seamlessly works with all 4 'things' (2 inverters, 1 BMS, and...
  8. derekisastro

    Daly smart BMS reported SOC issue

    There's gotta be something right? An inverter yes? If the circuit is not complete how are you able to use the BMS to read anything?
  9. derekisastro

    Daly smart BMS reported SOC issue

    When you say you have no load on it, what exactly is it connected to? Like the circuit needs to be completed somehow right? Do you have it connected to an inverter (that's my assumption), if so, most inverters, even with no load, do have a draw on them. I run Growatt all-in-ones and they draw...
  10. derekisastro

    Parallel and series connection of dissimilar amp hour LiFePO4 - best practices

    Each battery that you make and connect in parallel (ideally with a parallel bus) will have its own, independent BMS. There is no need or desire to 'parallel' the BMS's. Each BMS will connect each battery to the parallel bus, that's it. If you are asking about using a single BMS on parallel...
  11. derekisastro

    Solar panel shading and parallel versus series connections

    Less about zeal and simply more about life to care-factor ratio ... my panels are performing more than adequately at the moment, such that with my limited time the impetus to do such testing is quite low ... I will still do it and hopefully might find time soon so stay tuned!
  12. derekisastro

    Small backyard off-grid system: Permit requried?

    You might not get a reply from the OP but I am pretty sure, technically speaking, that even the OP's project would require a permit in CA/LA. It's kind of surprising how many people don't realize what you need permits for and even more surprising, some of the stupid things you're actually...
  13. derekisastro

    What triggers Growatt 3000 to exit float and resume bulk charging (via solar)

    I've never had that experience so I cannot offer a sugestion. Every time I get any solar energy, it seems to go into my battery. The fact that it doesn't, and with what you've described in other threads (and without knowing ALL your settings) it seems like your inverter is faulty.
  14. derekisastro

    Help wanted-Growatt/MPPT users.

    This seems like an inverter fault. I do wonder what the rest of your settings are. As Zwy has suggested, without knowing all of your settings it's difficult to comment. I will say, however, that what you're describing, adding a load and that triggers solar charging to begin, should not occur...
  15. derekisastro

    Growatt + Daly, constant pain

    That makes sense. I am still confused about what Ian thinks the issue is though. The non-smart BMS's usually aren't worth it. Usually though, it's because the parameters are set way outside safe voltages not because the values are tighter than what you would have on the inverter (sometimes less...
  16. derekisastro

    Growatt + Daly, constant pain

    I'd love to understand why Ian thinks the BMS's are the problem? From my understanding, the BMS essentially should never come into play. It should largely be invisible to the system. If it does come into play, it's because there was an issue that needed intervention. I can only assume that Ian...
  17. derekisastro

    Growatt 5000 TL charge priority setting

    Late to the party but I am assuming you may have worked out the AC charging (utility) values are determined by setting 12 and 13 ("back to battery" and "back to utility") and it cycles around this. AC charging will not kick in until the battery reaches the low end (12), then it charges up once...
  18. derekisastro

    Growatt + Daly, constant pain

    As has been suggested, LiFePO4 batteries will always 'settle'. They will not hold 3.6, 3.65, hell even 3.45 they do not hold. They will settle to a lower voltage; understand this is not a representation of the SOC (state of charge). I'd be content with mid 26 volts once it's been fully charged...
  19. derekisastro

    Help wanted-Growatt/MPPT users.

    Yep, changed the "Back to battery" setting, and now whenever AC charging kicks in, it goes to the "Back to Battery" setting (currently using 27.6). Again, in hindsight, I guess this kind of makes sense.
  20. derekisastro

    Help wanted-Growatt/MPPT users.

    Thanks for your repeated input. I can say that the last few charges cycles, of AC charging of the battery, have all ended within 0.1 volts of the "Back to Battery Voltage (26.8V for me)". It seems to me to be of too much coincidence to not be a factor, if not the cause of my issues. I don't...
  21. derekisastro

    Help wanted-Growatt/MPPT users.

    I can confirm that no cell has gone over the BMS set limits, no cell is even getting over 3.45V On another post on this forum, I found reference to possible issues with 'charge profile' in the "USE" settings on the Growatt inverter such that the inverter stops charging the battery, not at the...
  22. derekisastro

    Help wanted-Growatt/MPPT users.

    Hi Zwy, The pack was top-balanced. Unless it is some setting I have not seen, then I don't think it's a settings issue. I am monitoring the high cell voltage and the low cell voltage over time. It does not appear to be a runner cell but I will continue to monitor it. I'll let you know when I...
  23. derekisastro

    Help wanted-Growatt/MPPT users.

    Daly Smart BMS 100amp 24v. DIY LiFePO4 battery bank, 8s, just under 11kwh.
  24. derekisastro

    What triggers Growatt 3000 to exit float and resume bulk charging (via solar)

    What program is this screenshot of settings from?
  25. derekisastro

    What triggers Growatt 3000 to exit float and resume bulk charging (via solar)

    If you change your float voltage does this change this behavior... I recall reading a theory that it would start a charge cycle at "float voltage - 1V" or something similar. I need to test this too ...
  26. derekisastro

    Help wanted-Growatt/MPPT users.

    Not sure if what I am adding will help as my issue appears different but I do wonder if they may be some related factor with my issue. I am running a single unit, Growatt 24V SPF 3000TL LVM, and I am also not running enough panels at the moment that I have the issue of losing solar energy, my...
  27. derekisastro

    New Daly "Smart" BMS w/ Communication. (80-250A)

    Thank you for the quick reply. I do know that HA does have the Node-Red add-on, I am wondering if setting up the ESP bridge, using JeeLabs ESP-Link firmware, connecting to the BMS (without the CD4001 and ignoring BT) and then running Node-Red through my Home Assistant, utilizing your Node-Red...
  28. derekisastro

    New Daly "Smart" BMS w/ Communication. (80-250A)

    Sorry for the noob questions ... what is the purpose of the CD4001 you use? Is it necessary? Is there any way, even just for monitoring the system/BMS to connect the UART to an ESP device using your system? I am hoping to monitor it with Home Assistant.
  29. derekisastro

    Home Assistant - Solar Monitoring and Management

    Home Assistant is definitely has a learning curve. It is NOT a plug-and-play system. It was, and still is, designed around the premise of offering more ... functionality, versatility, and customizations ... than the Google Homes, Alexa's and other, out-of-the-box plug-and-play style systems...
  30. derekisastro

    Daly Smart BMS 4S 250A UART Version - UART Pinout for PC Parameter Setting

    Are you able to confirm that the 4 pin output labeled "monitor" is able to function like this? Would the 4 pins be tx, rx, 3.3v and gnd? If so, do you have a pin out diagram showing which pin is which for the 4 pin output labeled "monitor"?
  31. derekisastro

    Monitor Solar Input to Growatt spf 3000Tl LVM

    Look into Solar Assistant IO if you haven't already.
  32. derekisastro

    Parallel and series connection of dissimilar amp hour LiFePO4 - best practices

    Won't the 150ah and 271ah batteries in parallel self-balance? Such that at your example of 120ah used ... it'll be that the majority of the 120ah (approximately 150/271 as a fraction) comes from the 271ah and the remainder from the 150ah so that they are at a close state of charge? One won't be...
  33. derekisastro

    Parallel and series connection of dissimilar amp hour LiFePO4 - best practices

    Do you have data showing this degradation that you mentioned? I'd be interested in understanding if it is happening and what charge and discharge parameters may help with any possible degradation. My understanding has been that even if it's not the most ideal scenario, at charge and discharge...
  34. derekisastro

    Parallel and series connection of dissimilar amp hour LiFePO4 - best practices

    Why not? In "theory", there should be no problem doing it right? Especially at rates of charge and discharge 0.2C?
  35. derekisastro

    Parallel and series connection of dissimilar amp hour LiFePO4 - best practices

    As the title says ... I have 8 LiFePO4 batteries of 271Ah and I have 8 LiFePO4 batteries of 150Ah. I wish to connect them into a single 8S 24V battery bank. Should I make 2 separate banks of 8S from each group and then parallel the 2 banks together or should I combine 1 cell from each group...
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