The EasySolar goes to Sustain Mode. At 4:00 in the morning a bigger Load switches on (washing machine). The reason for Sustain Mode is the Battery Voltage? Best regards Thomas
asked
Sustain Mode EasySolar
Sustain, which Victron call absorption, is the fixed voltage part of a three or four phase charge cycle. Once voltage hits 14.4, AGM batteries are about 80% charged. Constant voltage completes the charge and current drops as it completes. Then the battery is held at a lower voltage, called float - charged, ready for action.
Sorry, but Sustain is not Absorption. Sustain is a protection mode for the Battery.
In ESS, sustain is triggered when the battery dips beneath the dynamic cutoff voltages.
Thanks, I found this text in the Victron documentation too. But what is the solution? In my screenshot the voltage is not so low, isnt it?
What batteries are these?
How have your ESS cutoff voltages been set?
Have a read of dynamic cut-off in the ESS guide.
That large load may be setting it off.
Dynamic cut-off is set in inverter with VE.Configure ESS settings If you have loaded it as an Assistant.
I use the Victron 12,8V Lithium SuperPack with internal BMS. The Sustain Voltage in the ESS Wizard is set to 12,5 Volt. The "Entladeschlussspannung" (sorry in german) is 10 Volt. Do I have to adjust the Sustain Voltage in ESS Wizard to an other value than 12,5 V ??
There is also Peukert law in play
https://en.wikipedia.org/wiki/Peukert%27s_law
if you add your capacity with parallel batteries, discharge rate per battery will decrease and you voltage drops slower, hence you won’t trigget the sustain that easily.
