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Drawing from grid with full battery
Posted: Mon Jun 16, 2025 5:05 pm
by Iggsy469
Had a situation today demand at 4.73 kw
PV supplying 2.04 kw
Battery @ 97% but only suplying 1.3 kw
Grid supplying 1.4kw
Very confused as to why the battery was not making up the whole of the shortfall.
Re: Drawing from grid with full battery
Posted: Tue Jun 17, 2025 8:49 am
by Dave Foster
When a large appliance switches on the system has to balance the load with PV and battery power, this can take a few seconds and if the datalogger sample is taken at this point you sometimes see these artefacts i.e. grid providing power, batteries exporting etc.. - check again after 5 minutes on the next update or look at the power statistics to see if it’s a constant draw in which case you may need to investigate further.
Fast transient loads such as induction hobs play havoc with the 5 minutes samples as they switch on and off quickly and you will often see strange results when they are being used.