🔋 Battery charging from grid - how to setup correctly
Good evening everyone. I am a bit perplexed regarding how to configure battery grid charge.
Question: Why is my system only grid charging at 4.9 kw when I am expecting 9kw?
Thanks in advance!!
My setup: 2x 5.5kva hybrids in parallel,
2x Pylontech US3000C
Situation: My entire plant is only using 4.9kw (20 A @ 220v) when drawing from the grid, even though.... - Each inverter is configured to charge from the grid at 40A. - By my maths, 40A at 220v is approximately 9kw. - I have a 40A breaker on the grid cable to the inverter.
System flow diagram:
(only 4.9 kw when really it should be taking 9kw)
My battery settings
(via sunsynk logger app) for master inverter (same config is found on slave inverter) :
Calculations
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Hi there @Vassen Moodley, it was setup by an installer.
I see what you saying about 0.5C charging and I think the whole system was configured by the installer with this all in mind.
I now understand why solar charging is less than desired although reasonable. 2.5kwh from 4.5kwh of panels (for charging, after covering base loads with priority loads enabled).
On reading the Pylontec manual I do see that recommendation regarding charge voltage. I am looking to get more batteries asap, 100% agree --- my system has so much unused potential. ASAP 👍👍👍
As for managing my loads, yes I think all is ok as we only use the batteries in the evening from 7pm to carry a base load of between 350 and 500w per hour. I have never seen any battery
Thanks for all the info and advice!
Below is an example of a decently sunny day
PV generated & used on a sunny day - 3.0 kw geyser from 11h30 until 16h00, - 0.6 kw pool pump from 12h30 until 15h30 - 0.35kw balance is the base load
Below is an example of a very cloudy and rainy day with a required evening top up charge to the batteries.
Extract from battery manual