RikusW

Yes I did connect the BMS and then it caused other issues with the inverter cutting out sometimes when charging fast. (SPF5000ES)

Hi This site seems to be run by a Growatt employee, so for those capable of board level repairs here is the service manual: https://www.amosplanet.org/spf-3500-5000es-09fault/ https://www.amosplanet.org/spf-3500-5000es-spf-5000tl-hvm-wpv-troubleshooting/

Hi I found a very useful website, it seems to be run by a Growatt employee. https://www.amosplanet.org/firmware-download-for-off-grid-inverter/ https://www.amosplanet.org/how-to-activate-control-board-of-off-grid-inverter-that-failed-upgrading/

I found something for SPF 5000ES - Soft start setting 051 https://www.amosplanet.org/how-to-restart-on-spf-5000es-or-spf-5000tl-hvm-wpv/

Hi Renier, already have one DU battery that is about the same age and if I can find a compatible inverter will be interested in yours. My Growatt works with solar assitant and voltage based charging only.

@Thunderdolt https://www.theforumsa.co.za/documents/SANS10142-1_ED3TC067_SC06_DSS.pdf You need a double pole circuit breaker on the input and output of the inverter https://resource.capetown.gov.za/documentcentre/Documents/Procedures, guidelines and regulations/Embedded_generation_schematic_drawings.pdf 7.12.5.1.1 Overcurrent protection and isolation shall be located as near as possible to the output terminals of each alternative supply unit, except where the cable connecting the unit to the distribution board is mechanically protected and is regarded to be within the fault-free zone of the distribution board where protection is installed. The circuit-breaker magnetic characteristic shall have a low threshold value in view of the high impedance in the case of a generator or of the current-limiting characteristics in the case of a static inverter UPS. Downstream coordination shall take this into account. To be consistent with the rest of this part of SANS 10142, overcurrent protection is required for the protection of the conductors, but might also provide protection to the alternative supply unit.

https://britelighting.co.za/collections/changeover-switches/products/circuit-breaker-din-changeover-2p-63a

Just saw this today, https://www.4-noks.com/shop/elios4you-accessories/power-reducer/?lang=en was considering building something like this, I'm guessing inside is something similar to https://www.researchgate.net/figure/Standard-ac-ac-buck-converter_fig12_224125119

The Growatt manual recommend USE 2 for lithium voltage based setup, equalization needs to be disabled.. The lithium protocol for Pylontech is L52 for the CAN connection, you also need a 120 Ohm terminator on the unused CAN connector on the battery.

The protocol also change immediately when changing the dip switches, no need to power cycle the battery. Something to be aware of if something accidentally bumps the switch and it goes to Victron 250 the inverter might switch off, I haven't tested this, maybe Growatt will autodetect bit rate change, also if the cable is disconnected the inverter will switch off.

The Axpert diagrams come with the user manuals.

PS, I'd also like to know how to connect the comms cable and if any settings needs to be done for the protocol like for example Growatt.

Hi I've set up the settings for a voltage based installation without comms cable for 2x Mecer Axpert mkII in parallel and 3x Pylontech US3000, the electrician didn't set the right settings, voltages/current was too high and batteries started to smell strange, still working now a few years later fortunately. The settings are 5=USE then 1,2,11,12,13,16,26,27,29 needs to be set, refer to the battery and inverter manuals. It might be necessary to add the cable voltage drop to the charging voltage, it might be a few hundred mV. RS485-protocol-pylon-low-voltage-V3.3-20180821.pdfPYLON LFP Battery communication protocol - RS232 V2.8 20161216.pdfCAN-Bus-protocol-PYLON-low-voltage-V1.2-20180408.pdf Regards Rikus

Check setting 14, CSO/SNU/OSO, SNU sounds like what you want ? and then limit the AC charge current.

In User 2 mode voltage based setup it stops charging once the bulk voltage is reached, no constant voltage charge, then restarts charging multiple times throughout the day and once solar output is low enough not to reach the bulk voltage remain charging until the end of the day.