j5_immortal

I received this from Pylontech:

I have 2 x Growatt SPF 5000TL inverters, 24 PV (12 x 340w and 12 x 365w). I have one stack of 8 x US2000 Pylontech batteries.I am keeping with my setup (05 -US2) as follows which seems to be working just fine up till now to get my batteries charged during the day, with combined charging current up to 100 Amps when active load requirement allows. This setup will normally get my battery stack fully charged up by 13H00, keeping it charged until sundown which will then see me through for the night. I am 100% off-grid most of the time during sunny days. The monitor app might not show the charge percentage of the batteries accurately (BMS cable not connected) but you can always check the battery voltage on the info (i) icon or on the detailed logs. As soon as you see the PV switches off during the day, you know your batteries are fully loaded. The internal battery BMS will switch off the charging current from the inverters when the batteries are fully charged and you will see the battery voltage indicated on the inverter jump up to +/-53V due to the battery charging load being removed. (My BMS cable is not connected to the inverters). I am quite satisfied with the performance and functioning of the system set up like this.First set up function 05 - US2 and then all the other settings and double check again after adjusting all settings:01 - SBU02 - 80A04 - SDS05 - US211 - 30A12 - 47.7v13 - 48.3v14 - OSO19 - 52.3v20 - 52.3v21 - 47.5v

Hi Janez I have the SPF 5000TL inverters but do not use it with the batteries connected to the inverter RJ45 (although it does have the connector and option) due to charging current limitations on the BMS when using it connected to the inverter. In Use mode you can adjust the charging current to charge at the max rated by the Pylontech batteries. I charge 4 x 2.4Kw pylontech batteries at 80A with 12 x 165W PV when they can deliver without problems. See my previous post for the settings I use. The internal BMS of the Pylontech will sort out the charging even if not connected to the inverter. The inverter will not accurately show the battery capacity in percentages but you can still monitor the voltage graph of the battery pack on the app to see the detail of charge/discharge.

Hi Bafaro69, I am glad you reported back on the latest software, I was wondering if someone with a similar setup than me has tested the charging current with the BMS. I have 2 x Growatt SPF 5000TL inverters, 24 PV (12 x 340w and 12 x 365w). I have one stack of 8 x US2000 Pylontech batteries. I am keeping with my setup (05 -US2) as follows which seems to be working just fine up till now to get my batteries charged during the day, with combined charging current up to 100 Amps when active load requirement allows. This setup will normally get my battery stack fully charged up by 13H00, keeping it charged until sundown which will then see me through for the night. I am 100% off-grid most of the time during sunny days. The monitor app might not show the charge percentage of the batteries accurately (BMS cable not connected) but you can always check the battery voltage on the info (i) icon or on the detailed logs. As soon as you see the PV switches off during the day, you know your batteries are fully loaded. The internal battery BMS will switch off the charging current from the inverters when the batteries are fully charged and you will see the battery voltage indicated on the inverter jump up to +/-53V due to the battery charging load being removed. (My BMS cable is not connected to the inverters). I am quite satisfied with the performance and functioning of the system set up like this. First set up function 05 - US2 and then all the other settings and double check again after adjusting all settings: 01 - SBU02 - 80A04 - SDS05 - US211 - 20A12 - 47.7v13 - 48.3v14 - OSO19 - 53.3v20 - 53.3v21 - 47.5v

Thank you for the feedback, I have adjusted the float voltage down to 52.2V now, just to be a bit on the safer side, however Pylontech specifies charging voltage up to 53.5V. Unfortunately with the BMS running things I could not get my 8 x US2000 battery group to charge at 80A . it always limits around 25A, of course bat amps report higher with load requirement above this charging current level. On USE02 I can get my battery stack fully charged by PV at 80A. I am yet to see someone with PV panels and BMS reporting a proper high charging current on a large battery group. Will just have to stay on USe02 mode for now. Works quite well for now.

Hi Strauss, I run two SPF5000TL with 24 PV and 2 x 9.6KW Pylontech stacks. I use the firmware originally provided by Siliconkid. It works fine accept the charging form PV doesn't seem to work very well and charge current is limited to 25A (too low for 20KW batteries), the use2 setup works fine for me. Can you perhaps post your typical charging graph logs, I would like to compare with the BMS controlled results you have. Image: This is what my charge curve looks like, charges up to 53V until sunset: Second image: my daily chart on one of the inverters.

This is correct, the Pylontech BMS will not communicate and the Inverter is monitoring the battery voltages and the charging under the user mode US2 setting. The Li light will be flashing, that is normal. The US2 setting works well for me.

Yes, I believe it should work for you as my aim is to function totally off the grid as well with these settings. Over weekends when my load footprint is lower I am already of grid.

Also, even with my settings as above the power from the PV will be shut off or be limited when the batteries are fully charged and there is not enough demand from the load. If this happens on a daily basis, it means you have abundant solar energy available that are going to waste, it is a call to you to expand your battery storage capacity so you can utilize the additional solar energy and convert it into storage for night use. On my graph above the PV output is not limited because I have expanded my batteries to a stack of 8 x US2000 recently and there is not enough power from the 12 x PV to fully charge the battery stack and therefore supplying full capacity. I am currently expanding with additional 12 x PV... In addition to the settings mentioned above during regular load-shedding you will need to set program 14 to OSO to keep batteries charged even with grid power if required, so you can have power from batteries for when load-shedding occurs after sunlight hours.

Hi djacobs, it has to do with the the correct setup of priorities as well as the voltage levels. Your batteries takes over too soon if the voltage levels for switchover to battery supplying the power is too high. I have 4 x US2000 Pylontech batteries with 12 x 360W PV. I do not use the Pylontech BMS to control the setup as it limits the charging current for the 4 x batteries to 25A for the stack which is way too low to get battery stack charged up during the day. The following settings are what I have setup and it allows the PV to supply power the whole day and charge the batteries without being switched off: 01 - SBU 02 - 80A 04 - SDS 05 - US2 11 - 20A 12 - 47.7v 13 - 48.3v 14 - OSO 19 - 53.3v 20 - 53.3v 21 - 47.5v As you will see, when no loadshedding schedules are implemented, I use setting 14 on OSO (Solar charging only, no ghrid charging), Setting 1 is on SBU: Solar supplies power to load, after sunlight hours, batteries will take over the loads until battery voltage falls down to setting to 47.7 V (setting 13), then grid takes over the load until sunlight and solar takes over again. During the day if loads are too high or aclouds block solar power, batteries takes over load until it falls to 47.7v, then grid takes over if insufficient sunlight, as soon as battries charges up to 48.3V (setting 13) battries takes over the load again, and so forth.... from my graph below you will see the effect of this setup: Batteries works minimal during sunlight hours and I get most out of the PV's, grid only kicks in when battery voltage reaches 47.7v under load. During regular load shedding schedules you would want to keep your batteries from draining during the day if loads are to high or cloudy skies. During these times would need to change the change Setting 01 - Sol, 12 - 50, 13 - 53.3. Hope this helps See an example of my graph over 24hrs attached

The master battery dip switch must be 1000, the rest you can leave on 0000. Not sure if this will make a difference. Also check setting 12 to be 48V, if too low the battery BMS may switch the battery stack off and the inverter will also switch off.

To overcome the low charging rate with the Pylontech BMS and wasting valuable available sun power I have switched back to Use Lo5 setting. I have received the following recommendations by Pylontech from an installer when using user mode: Program 02: Set to N*25A, N=number of batteries Program 05: Set to USE Program 12: Set to 48V Program 13: Set to 51V (I use 49V which means the grid supply will switch off sooner in the morning as soon as the battery reaches 49V from Solar charging) Program 19: Set to 53.2V Program 21: Set to 47.5V I am still trying to get an answer why the BMS limits the solar input to charge 4 batteries only at 25A when abundance of solar energy available, the BMS software seems lacking in this respect and it doesn't make sense.

Hi SiliconKid, I have installed : 1 x Growatt SPF 5000TL HVM 5kVA/5kW Hybrid Inverter. 4 x Pylontech US2000 batteries. 15 x 340 wat Solar Panels I followed your instructions for the firmware and it is working 100%, thank you. I have one problem, I realize you don't have PV panels but maybe you'v' come across this problem: The maximum charge current when using the solar panels to charge the 4 x Pylontech US200 batery stack is set at a maximum of 25A which is way too low to get the 4 x batteries (each are specified for a recommended 25A) charged during the PV panel charge time. It seems the firmware doesn't allow setting 02 to be set to a higher max charge current, or the inverter sees only one Pylontech battery. I have the master battery dipswitch set at 1000 and the others on 0000. You are charging from grid,at what current do you charge and do you have any suggestions on this issue? Thanks

Hi SiliconKid, I would like to PM you for the firmware but is waiting more than a week now for account approval from admin. Can you please email me at [email protected] with the details? Much appreciated Philip