somewhereinusa
Solar Enthusiast
I hesitate to post this, last time I posted something I was told I didn't know what I was talking about.
This is all done and installed for testing except for actually hooking up the main relay. It uses external sensing, not internal Valance. Until I can get more data I'll hook up the laptop to keep an eye on the Valence internal BMS. I've added a temperature sensor inside of each battery. It logs to a memory card and sends data to my phone via bluetooth. I was surprised to find that I can get the data from inside the house.? Unfortunately, now that it's spring I can't test the cold weather part but, I did thoroughly bench test it when it was still cold. This is basically a "If everything else fails do this" setup. The Victron solar charge controller can be controlled with an external switch, the Victron multiplus cannot.
Overview of system.
1. Arduino Mega
2. Voltage regulator
3. 9 DS18B20 temp sensors
4. Switchdoc labs INA3221 voltage sensor
5. 4 SS relays
Relay 1----Main Disconnect
Relay 2----Victron Charge controller
Relay 3----Cabin cooling fan
Relay 4----Battery heat
Temp sensor 1 Battery #1
Temp sensor 2 Battery #2
Temp sensor 3 Battery #3
Temp sensor 4 Battery #4
Temp sensor 5 Battery #5
Temp sensor 6 Battery #6
Temp sensor 7 Cabin temp
Temp sensor 8 Battery heat temp
Temp sensor 9 Outside temp
Relay 1 disconnects battery bank from everything *
Relay 2 turns solar controller ON/OFF *
Relay 3 turns ON/OFF compartment cooling fan
Relay 4 turns ON/OFF battery heating
*In all cases relay 1 turns on before relay 2 and relay 2 turns off before relay 1.
voltage < 9.5 open relay 1&2
voltage > 15 open relay 1&2
any batt temp 1-6 > 175° F open relay 1&2
any batt temp 1-6< 40° F open relay 1&2
temp sensor 7> 90° F close relay 3
temp sensor 8< 45° F close relay 4
temp sensor 8> 50° F open relay 4
Sends data via bluetooth to phone.
Used real time clock to keep track of date and time.
Saves data to memory card. Every ten minutes. If something triggers relay 1 and 2 logs every 10 seconds.
Overall system.This is mounted on back side of bedroom wall. Everything on left side of picture.
The batteries on floor of same area.
Screenshot of data on phone.
Another view of the control panel.
This is all done and installed for testing except for actually hooking up the main relay. It uses external sensing, not internal Valance. Until I can get more data I'll hook up the laptop to keep an eye on the Valence internal BMS. I've added a temperature sensor inside of each battery. It logs to a memory card and sends data to my phone via bluetooth. I was surprised to find that I can get the data from inside the house.? Unfortunately, now that it's spring I can't test the cold weather part but, I did thoroughly bench test it when it was still cold. This is basically a "If everything else fails do this" setup. The Victron solar charge controller can be controlled with an external switch, the Victron multiplus cannot.
Overview of system.
1. Arduino Mega
2. Voltage regulator
3. 9 DS18B20 temp sensors
4. Switchdoc labs INA3221 voltage sensor
5. 4 SS relays
Relay 1----Main Disconnect
Relay 2----Victron Charge controller
Relay 3----Cabin cooling fan
Relay 4----Battery heat
Temp sensor 1 Battery #1
Temp sensor 2 Battery #2
Temp sensor 3 Battery #3
Temp sensor 4 Battery #4
Temp sensor 5 Battery #5
Temp sensor 6 Battery #6
Temp sensor 7 Cabin temp
Temp sensor 8 Battery heat temp
Temp sensor 9 Outside temp
Relay 1 disconnects battery bank from everything *
Relay 2 turns solar controller ON/OFF *
Relay 3 turns ON/OFF compartment cooling fan
Relay 4 turns ON/OFF battery heating
*In all cases relay 1 turns on before relay 2 and relay 2 turns off before relay 1.
voltage < 9.5 open relay 1&2
voltage > 15 open relay 1&2
any batt temp 1-6 > 175° F open relay 1&2
any batt temp 1-6< 40° F open relay 1&2
temp sensor 7> 90° F close relay 3
temp sensor 8< 45° F close relay 4
temp sensor 8> 50° F open relay 4
Sends data via bluetooth to phone.
Used real time clock to keep track of date and time.
Saves data to memory card. Every ten minutes. If something triggers relay 1 and 2 logs every 10 seconds.
Overall system.This is mounted on back side of bedroom wall. Everything on left side of picture.
The batteries on floor of same area.
Screenshot of data on phone.
Another view of the control panel.
