frans400

I have JA solar panels @TaliaB

Generated 9.6kwh with 18X540w panels in Centurion, 9 panels in a string facing east and 9 panels in a string facing west. 2X 5kw Sunsynk inverters with 4X Narada 100ah lifepo4 batteries, the system is about 3 years old.

 

The geyser controller unit

-Fit into an weatherproof 4x4 box.
-Has an current sensor to monitor if the thermal cutout of the geyser is active or not
-Has an digital temperature sensor input to monitor the temperature of the water
-Will repeat info from other geyser controllers in the system that is not in range of the main inverter controller
-Can control 3 geyser element to control the amount of power a geyser use

How the multi-element works?
The multi element geyser elements welded onto the geyser flange the first element consumes 400watts the second 800 watts and the third element consumes 1600 watts. Therefore you can increase the geyser power consumption in step of 400 watts, for instance if you want the geyser to use 1200 watt the first and second element will turn on. If any of the element are turned on and the current sensor pick up that no power are consumed the geyser controller will notify the main controller that the geyser thermal cutout unit have been activated and that geyser next in line can be heated.

So there would be 2 types of aging to consider:
Cycle aging Calendar aging
I believe cycling the battery ages it more than calendar aging. Various factors to consider in terms of the percentage of how much capacity is lost.
 
I am also curious as to how long a LFP battery could last though, if it was seldom cycled and mostly just aged after say 20 years. Would it still work and be fine? Is it just  capacity which is affected? Would the current it could provide be affected at all?