Hi maverick Can you explain the logic of 55v for 3 hrs?
Thx Jay > On May 17, 2025, at 7:50 AM, Maverick Brown via RE-wrenches > <[email protected]> wrote: > > Jason, > > I think it is valuable to have SOC information available if you also have an > InsightHome device that can show the SOC data for reference etc. For legacy > inverters, voltage still makes the decisions. > > I don’t know of any battery that communicates together to balance between > individual battery entities. That still leaves the necessity to charge via > voltage high enough to get all batteries to high and similar SOC. > > The E-BOX says via Pylontech protocol that its battery voltage range is 46.5V > to 56.8V, so I think 48V LBCO is fine and certainly 44 is too low. > > There is a “.8” version of battery firmware and a “.16” version. I can send > you the .16 version that I have (SPBMS16SRP2205V1.5.18.C16). I use > HyperTerminal to install the software and it is the absolute easiest battery > to view the details using the Pytes USB to Serial cable (other cable brands > could also work). HyperTerminal was provided free by Pytes. I can send you > that as well. A lot of this might still be on their website. > > I lieu of having a Pytes Hub to stack the existing bank as multiple groups of > 10 batteries, you could upgrade each battery to .16 firmware and make two > communicating stacks of 10 that don’t communicate together. If you have > InsightHome, you can wire the CAN port of the left 10 to Insight and the > RS485 port of the right stack to Inight and make “two battery banks” show up > in Insight. On the Pytes, the CAN RJ45 Blue pair is CAN and the Orange Pair > is RS485 (from the RS485 port). If you have InsightFacity you can use both > CAN ports. CAN devices show up automatically and RS485 device need to be > setup via InsightLocal / Setup / Device Detection / Detect Device / RS-485: 1 > to 10. > > On the Charge Controllers, I would set Absorb to 55.2 for 3 hours. > > I even started using EQ at 56.0 on some systems. > > Good luck today! > > > Maverick Brown > Off-Grid Solar Commander since 2006 > Maverick Solar Enterprises, Inc. > • Solar Commander Remote Power > • SunFlow Systems Cathodic Protection > [email protected] > 512-460-9825 > >> On May 16, 2025, at 6:22 PM, Jason Szumlanski via RE-wrenches >> <[email protected]> wrote: >> >> The advantages of closed loop communication between LFP batteries and >> inverter systems are pretty obvious. But when you are operating in an open >> loop because you are working with a legacy inverter that does not support >> battery communication, how important is it for batteries to be wired >> together? >> >> I started contemplating this today when I ran into a Pytes stack of 20 E-Box >> 48100R (5kWh) batteries. Whoever installed them wired all 20 in a single >> communication daisy chain. Come to find out, this version of the battery >> only supports 8 or 16 in a communications network. The bank is connected to >> a couple of XW+ inverters, so it is operating based on voltage. The owner >> must have had to use an unconventional method to turn the batteries on, >> because typically you would only press the switch on the master battery. In >> this case, that doesn't work because the communication chain is broken at >> some point. >> >> The reason for my visit was the battery is sitting at 43 volts because the >> generator didn't start and the low battery disconnect was set to 44 volts, >> well below the 49 volts recommended by Pytes. Side note: I could not set >> the low battery cut out higher than 48V with these inverters. >> >> I was there to get these jump started with a Chargeverter. I rigged it up >> and got things going, but various batteries were alarming out. Ultimately I >> just disconnected the communication cables on all the batteries and they all >> started charging from the Chargeverter which was connected to the common >> bus. Awesome! >> >> So back to the original question... Are the batteries really doing anything >> in terms of balancing when they are connected in a communications daisy >> chain when they are not enclosed loop communications with an inverter? How >> important is the communication anyway? And in this case, assuming that the >> maximum batteries in a communication chain is eight, I would probably be >> better off setting up four separate communications with four master >> batteries in groups of five. Again, I'm not sure how important that is in >> terms of balancing. What if I had different quantities per communication >> group? They're not talking to each other anyway! >> >> Not to muddy up this thread, but I will say that the Chargeverter saved the >> day. Within 20 minutes, I was able to get the inverters turned on and the >> SCP to help me identify what went wrong. Then I turned on the inverters and >> got them charging the batteries simultaneously with the Chargeverter and >> solar. It really just needed a jump start! I had rigged it up in a way that >> I could easily do this and then safely disconnect the Chargeverter while the >> rest of the system continued to charge the batteries. It was my first >> experience with this little gem, and I'm happy to have it in my toolbox now. >> >> Tomorrow I am going back to restart the charging process and hopefully get >> the batteries up to 100%. I also plan to check the firmware, which I am >> almost positive is mismatched in this stack of batteries. All of my off-grid >> systems are a boat ride away, so I'm going to pretend it's a weekend and I'm >> not working. Haha. >> >> >> Jason Szumlanski >> Florida Solar Design Group >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/[email protected]/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org >
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