I’ve been using six Pytes V5 batteries in pair with a Victron Multiplus 2 for a year. Everything is fine, except that in winter, when the batteries need self-heating, “they tell the Victron system” or “vice versa” to draw power from the national electricity grid, instead of using the batteries, even though the batteries are fully charged.
How can I prevent this?
notes :
When the weather is nice, there’s no problem, because the batteries don’t need any energy to heat up.
In winter, When I’m disconnected from the grid in off-grid mode, the batteries heat up using their own energy.
aiui there is no temp specific entry in the BMS CAN spec to block charge/discharge.
It is a function of the BMS hitting temp thresholds and disabling or lowering limits.
The Inverter is just following what it is told and likely has no clue what the cause is.
You can integrate with nodered and provide some protections to pre-empt the BMS cutting out.
Yes, I have 2 Batteries Temperatures imputs ( 512 and 276 ). Both are a different from real Air Temperature ( 512 is +5°C and 276 is -5°C from real Air Temp )
I don’t know how to trim to correct that input. The 276 probe says battery is -5°C instead of 0°C ( the exact Air temperature at the moment )
Every time the temperature goes beyond or around -5°C → Pytes Battery asks for heating ( each batteries has got its own heating pad system )
→ When the grid is disconnected → Energy is drown from the battery itself ( good ! that is what I want )
→ When the gris is connected to the Multipus → The Multiplus draw kWh from the grid to provide the heating system of the batteries.
ps : Thanks but, Node Red might be too complicated for me. I whish Victron / or Pytes will improve their protocol
