Hi. I have a Multiplus-II and two 5kw batteries. I’m currently charging the batteries using the grid. I noticed that Ac input is almost 2000w but the battery only seems to be getting 877w
What I think you may be seeing is the charging value for only 1 battery, 2 x 877W is 1754W so agrees with your input 1990W with about 10% losses.
This is sometimes seen with unsupported batteries, or batteries where the master / slave is not set up, or where there is a comms problem or if the BMSs are not interlinked.
The batteries are from China called ‘Improve’. I do have the master / slave dip switches set up, but it is probably reporting the charge for 1 battery only as you said. Thanks.