Feature request: Save harvested energy on power loss

[jaybee79]

Hi, how about saving the harvested energy to the EEPROM when the power is lost?
Normally the MPPT charger will stay powered by the battery, but if there is any event where the battery is disconnected (for example because a BMS disconnects it for any reason) the most important data is lost.
The question is: Is the software loop fast enough to detect when the battery is disconnected and writing the value to the EEPROM in that case? For example store this value when the battery voltage drops below the the value stored in the EEPROM as minimum battery voltage.
Another idea (not for automatic storage): Store the harvested energy using the settings menu, that would be usefull in case of a software update on the MPPT charger.

[fl4p]

You can just store the value when solar input voltage or battery voltage fall below 10V. It is very unlikely that both solar and bat are disconnected at the same time. And if one is disconnected, the energy counter won't change, so there's nothing to store

[jaybee79]

I've tried a slightly other method: (Input <14V && Output <12V && Output >4V). The 12V lead acid battery I use won't normally go below 12V, so <12V means it's disconnected. If the solar voltage is off there is just enough energy in the capacitors to give me 1 or 2 write cycles until the voltage gets to <4V where the DC/DC converter stops producing the 3,3V.