ESS Battery drawing more power than demand

Hi @WAC768, I’m afraid I’m not familiar with the Livoltek system…I just rely on my smaller inverter not exporting anything to the grid when its storage battery is discharging, mainly at night.  
 

I have noticed, though, that the “zero export” functionality of my little system goes a bit bananas if my house’s demand drops below around 20 Watts (for example during periods when the ‘fridge freezer and the chest freezer compressors aren’t running). For that reason, I’ve stopped going around at bedtime switching off router, neon switch for the cooker, doorbell transformer etc., as the inverter seems to “like” the household load never dropping below 20Watts or so. The “low loads” you mention, are they below this kind of minimal level?

As @BPLightlog says,  check your smart meter consumption to see what exact loads have been running, but I would also check the export kWh in your smart meter, I assume this should be a tiny or even a zero figure? Is it possible your system is exporting a small amount to the Grid, or is the Livoltek not grid tied in any way when it’s not charging?  I tried a hybrid ESS system for a few months, but I prefer the on-grid zero export type of setup now. 
 

On one occasion, but only once, I caught my small (battery-based) inverter fleetingly showing a mysterious and random 300W drain on the battery, but only for half a second or so, thankfully!  300 Watts is not unusual when everything clicks on at once, but I’m talking about a fleeting completely random 300 Watt demand, which I’ve only caught it doing that once. Goodness knows what it thinks is going on if and when it does that, perhaps it’s an internal check or something. It’s certainly not enough to register on my nighttime usage stats…your situation doesn’t sound similar though, I think?

You can get your own import/export meter very inexpensively: I hard-wired mine, but there are CT-based ones as well, although space may be limited in and around your consumer unit?  And you may glean enough information from your IHD and the smart meter itself, but I like to have my own kit as a “second opinion”!

Good luck with it, it’s a frustrating conundrum you’ve got there!  Is the Livoltek tech support any good?