AC Coupled hybrid inverter charge settings
I have a grid tied AC coupled sunsynk 3 phase hybrid inverter connected to a battery bank. At the moment this inverter charges from the grid during cheap rate as instructed then during the day it charges the batteries from what would be exported power produced by a seperate grid tied inverter with a solar array connected. This separate inverter is not linked to the sunsynk inverter and batteries in anyway other than both being connected to the grid and working on the same consumer board..
What I want to be able to do is for my sunsynk inverter to charge from the grid during cheap rate overnight but NOT too charge the batteries from what it sees as grid export during the day. The sunsynk inverter does not have any PV attached to it. It simple balances the grid by charging/discharging as required to keep import and export as near as neutral as possible. I want the battwries to discharge to avoid grid import, but I don't want the battwries to charge from the export provided by a separate inverter.
The sunsynk inverter monitors the grid import/export using CT Clamps at the moment, is there anyway I can set it to charge only from the grid at night time and not to take power produced by a seperate inverter so the seperate inverter can export.
It is better for me to export at 15p per kWh and then to charge the batteries from cheap night rate from grid at 7.5p kwh. The setup always charges batteries from what it sees as grid export. Can I change this?
Thank you in advanced for any help.
Using a charge current of 100A means that current for each battery is only 20A. There is certainly no harm in keeping the cuurent below the recommend Charge/Discharge value of 80A. It will put less stress on the battery. However this will mean thatit would take about 5 hours to fully charge the battery from the lowest SOC (empty battery). The same calculation applies to discharge. These Pylontech batteries are quite capable of charging and dischatging at a higher rate. The key consideration when trying to extend the life of the battery is actually the DOD used (controlled by your SOC settings) and the number of cycles where a cycle is coinsider as a discharge from 100% to the allowed DOD of 95%.