September 24, 20223 yr Hi. Can someone please supply me with the correct charging settings (charge voltage, float, absorbsion, etc) for above batteries connected to a Sunsynk 5kw inverter. There are 2 x 3.5kva Pylontechs connected with bms canbus cable. The battery settings screen, the voltages looks a bit too high for me.
September 24, 20223 yr You dont have to change any of the voltage settings if you have BMS comms . Just set battery capacity correctly and discharging and charging amps thats it .Edit* Signal island mode has to be ticked to make your earth neutral bond relay work . Edited September 24, 20223 yr by Nexuss
September 25, 20223 yr This will depend on the exact model of the battery and number of cells, there are a lot of different pylontechs with different specs... That said, if it is the US3000 series it looks like those voltages are very high. The US3000C has a suggested bulk/absorption voltage of 53.5V.
September 25, 20223 yr Author Thanx guys. Will set down bulk voltage. Shall I keep absorptiin and floating voltage the same?
September 25, 20223 yr 2 minutes ago, OttoN said: Thanx guys. Will set down bulk voltage. Shall I keep absorptiin and floating voltage the same? Setting the bulk voltage down will do absolutely nothing if you are connected via CAN and have comms.
September 25, 20223 yr Pylon max voltage setting is 53.2v (at very max 53.5v but not at all recommended) Any voltage over 54.5v will permanently damage the batteries BMS. As has been said before if the CAN is connected the settings should be set automatically. You must check the communication is working by checking the inverter settings in the correct place. I don't have that inverter so have a good read of the manual.
September 25, 20223 yr 2 hours ago, OttoN said: Thanx guys. Will set down bulk voltage. Shall I keep absorptiin and floating voltage the same? I would use 53.2V as suggested by @Tinbumfor bulk and absorption and set float to something like 52V for now. If your bms comms are working then I would think the inverter wouldn't let you change these settings (should be grayed out), but I don't know for sure. I would at least expect these values to be automatically set correctly if the comms are working. I would change the settings first if the inverter allows and then figure out if the comms are indeed working.
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.