sorry for my english, this is my first post
I suppose may be interesting for someone to realize a project like mine: to use a pair (or more but even number) Tesla S module for energy storage from photovoltaic plant.
After some monts of experiments I realized the project, now I have a 10 kWh battery at low cost with an Goodwe EM serie hybrid inverter
The job was no easy, first no one inverter house helped me to modify only one parameter or to know some serial protocol to external bms battery, second: Tesla module has 6s (12s if two in serie)when the almost all hybrid inverters need a 14s external battery to work properly and for that serie has some voltage limits.
For solving these problems I realized a gateway, with this device I send to inverter the BMS data from modules traslated by one of admitted battery (BYD, PYLONTECH...)
So I have a board for digital signals and another one for relays
A power relay is used for cut power connection in case of faults, a precharge relay is controlled by timing circuit, another relay is used to control an external load when SOC is 100% from more than one minute.
For solve the problem of internal voltage limits of battery use of the inverter it was necessary to open inverter and analyze circuit, furtunally I found the network who read battery voltage and I modified a resistor value withan external circuit
I thik to add two more modules in the future, these first two is enough for one night on summer but I suppose not when daylight become less
I suppose may be interesting for someone to realize a project like mine: to use a pair (or more but even number) Tesla S module for energy storage from photovoltaic plant.
After some monts of experiments I realized the project, now I have a 10 kWh battery at low cost with an Goodwe EM serie hybrid inverter
The job was no easy, first no one inverter house helped me to modify only one parameter or to know some serial protocol to external bms battery, second: Tesla module has 6s (12s if two in serie)when the almost all hybrid inverters need a 14s external battery to work properly and for that serie has some voltage limits.
For solving these problems I realized a gateway, with this device I send to inverter the BMS data from modules traslated by one of admitted battery (BYD, PYLONTECH...)
So I have a board for digital signals and another one for relays
A power relay is used for cut power connection in case of faults, a precharge relay is controlled by timing circuit, another relay is used to control an external load when SOC is 100% from more than one minute.
For solve the problem of internal voltage limits of battery use of the inverter it was necessary to open inverter and analyze circuit, furtunally I found the network who read battery voltage and I modified a resistor value withan external circuit
I thik to add two more modules in the future, these first two is enough for one night on summer but I suppose not when daylight become less