Advice on my Growatt and Pylontec installation

Hi All,

We have an "off grid" setup which is proving to be costly on our electric bill due to early morning charging from grid. I am reaching out to the community for advice on how reduce / prevent this charge spike and hopefully reduce our bill (please refer to charts below).

Installation:
2x Growatt SPF 5KW, 4x Pylontec 3000C Li batteries, and solar panels to product 5KW, Solar Assistant monitoring system.

Issue:
Currently, the average load throughout the night is approx. 800w. The batteries are able to service this load until the batteries reach 20% (47.6V) - around 4:30am. This is when the grid is used to recharge batteries to 80% (51.0V). This charging period lasts around 2.5hrs and at a rate of 35.A which registers the 4Kw spike in the graph below.

Does anyone have any suggestions to either reduce this spoke or even prevent it (e.g. firmware upgrade, inverter settings), or do we need to add additional batteries?

Any help will be greatly appreciated

I have a growatt 8000. Not the same but, I believe you can change your settings as not to charge at all. Or less amps and even to a lower level, say 40% battery s.o.c.
Spend some time reading the manual and experiment with some settings.

How have you gone with this? I have a similar setup but with mpp solar 5048mgx, you could change the back to battery voltage lower? that woud reduce how much it would grab from the grid.

Yes, set your 'from grid charge' as low as it will let you. Mine is 10 amp.
Change your, back to battery, level lower... say 40%. This will change back to, the off grid use, earlier in the day. That is less charge time. And, by 40% you are on the upswing of your charge cycle.
Growatt has a "solar only" setting that is not supposed to use the grid to change at all. Mine however always charges at 10 amp. That equates to approximately $1.60 U.S. on the rare occasion I bump to gird, so I just leave it alone.

Tried setting to charge only from solar?