So the manual says recommended current of 25A and max current of 50-89A@60 sec.
However since I have two batteries I think that should be 50A and 100-178A.
Multiplying that by 50V should give recommended 2,500W and max 5000W-8900W.
Should I read that as "don't go above 2500W load on the battery for more than 60 seconds, ever" or perhaps more as "try not to do it excessively"? Am I Ok to run 4000W load at night? - this would mostly be for 2 to 6 minutes at a time for an average of less than once a day. Will going too high cause any damage to the battery, or will it just cut over to grid electricity or withhold power when it is under strain? I'll probably run an experiment and plug in two kettles after dark to see if the battery can handle 4000W. Let me know if this is a bad idea.
I decided, after dark, to fill and turn on two kettles. This brought the total house load to just over 4200W. I figured 4000W+ load at night is going to happen sooner or later so I may as well just do it at a convenient time and watch what happens.If the battery is overloaded, the battery management system (BMS) should cut power supply to the inverter. If I'm not mistaken this means your inverter will also shut down as it requires battery power operate.
Your batteries are not designed to supply high power so I suspect you will be confined to operate within your 2.5kW limit.
The battery provided all the energy successfully without grid use or a power cut for about 4 minutes until the first of the kettles came to the boil and turned off. However a red light came on the master battery at some point. I ignored this and it still worked.
If the total load was 4200W that may indicate about 84-88A for 4 minutes, well above the recommended discharge of 50A total for the two batteries.
The manual states "if current exceeds 90A, battery protection will turn on". I assume I would have to draw about 180A across the two batteries to get to 90A on one, which would never happen since that is above the inverter´s power rating. Since the 50A discharge is just a reccomendation, I´d guess exceeding it occasionally just for a few minutes won´t be damaging to the battery.
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