Hi,
isn't there a contradiction between the 2 official sources?
https://www.victronenergy.com/media/pg/SmartSolar_MPPT_RS/en/troubleshooting-guide---mppt.html says:
5.4.7. Wrong temperature compensation setting
To find out the correct temperature compensation coefficient setting for your battery, refer to the battery documentation. When in doubt use the default value of -64.80mV/°C for lead acid batteries and disable the temperature compensation setting for lithium batteries.
The graph displays the temperature compensation for a 12V system and uses a -16mV/°C temperature compensation coefficient. For a 24V system multiply the voltages by 2 and for a 48V system multiply by 4.
I have a 24V, Lead Carbon, (2x 200Ah) with MPPT 100/30, Off-grid.
Using both mentioned sources, I can't figure out if -32 mV/°C (2x 16 according to the 2nd source) or -64 mV/°C (according to the first source) is the correct setting.
What I measured: Battery1=12,84V, Battery2=12,87V, B1+B2=Inverter=25,71V. MPPT Battery=26,1V
Victron App shows 26,1V.
Now, it is mid-day (hot, sunny, after charging for 5h) and the MPPT is in a warmer space (closet with inverter producing heat) than the batteries (under the bed). And I measured under load and while charging. That's probably the biggest mistake.
Thanks!
Armin
Edited: https://www.bluesunpv.com/bluesun-12v-200ah-lead-carbon-battery-with-certification-made-in-china_p514.html are my batteries. The data sheet does not
