I updated my Multiplus II GX 5k inverter to the Victron MultiPlus-II 48/6k5/100-50 at the start of the summer as I will need 100amp charging to take advatage of the cheap electricity from Octopus. As I have Solar I haven’t needed to charge the batteries from the grid as there has been enough Solar to top the batteries up on a daily basis.
Today Octopus had a free 1 hour electricity slot so I set up a timed slot to take advantage., additionally it was also sunny so I was getting around 2.8Kw from solar. The overall charging was around 60amp not 100amp. I also tries changing the batteries to Keep batteries charged and got the same result.
I have been through the configuration and can’t find anything that looks misconfigured.
Shore Limit 63amp overruled by remote enabled
Grid UK G98/1 amendment 6
Charger 100 amp
Assistants ESS (Energy Storage System)
ESS external meter
Mode Optimixed without Battery Life
Limit inverter power off
Battery monitor Automatic
Auoselected Pylontech batter on CAN-bus
Battery modules 7
Installed / Available capacity 570Ah
Charge Voltage Limit (CVL) 53.20V
Charge Current Limit (CCL) 335A
Discharge Current Limit (DCL) 365A
The low charging isn’t a problem at the moment as there is time to charge the batteries overnight. The problem will be apparent when winter draws in.
@wrightste What are the charge settings on the inverter itself if you download it into ve.configure? Also, using the G98 gridcode turns (read restricts) the inverter effectively into a 3.68kW inverter compliant with G98 cerification requirements. This unit has however not received certification yet in the UK if installed there.
I have been having a dialog with the dealer that supplied my MultiPlus-II 48/6k5/100-50. We have been through all the configuration parameters and nothing is amiss. The unit itself is correctly wired and functions apart from maxing out at 60amp when charging.
The battey management system is showing a CCL of 365amp which is what you expect given the battery configuration of 5 x US300s and 2 x US5000.
I have a MP8000 with 8 Pylontech US300C batteries and get the full 105 amp changing. I upgraded to this from a MP5000 which also gave me 70 amp charging which is still higher then what you are getting. I actually upgraded because I needed the 100amp transfer and the increased charging was a bonus. My setting look like yours but a little lower
If you setup a graph in your advanced panel what do you see? Here is mine which lowers and the batteries get full and then raises again as I empty them
It has been sugested that this may be due to the G98 grid code. In order to change the Grid Code I will need to obtain an unlock code from the dealer which I will do on Monday.
I have enabled the Battery Monitoring as suggested by Dave and will check and post the results tomorrow morning.
When you add the chart for BMS limits to VRM advanced it should have historical data available, so you can rewind to a time you saw the behaviour and correlate any reductions in CCL.
I hadn’t realised that there was historical data I currently don’t fully charge the batteries as there is still plenty of sunshine. I have grabbed the data from yesterday / this morning which shows charging and charge limits
I can see that a G98 / G99 profile limits the output available to export but what I having difficulty with is its ability to limit the charging current.
I stand to be corrected, my understanding is it clamps the overall performance. The system is a converter, it either charges or inverts, it cannot do both.
I had previously asked for clarity on this and not got a definitive answer for similar questions where a larger multiplus was being limited.
I would agree the wording is a bit vague focusing on exporting.
In this case I would be happy to be incorrect, your grid code change should prove/disprove that easily enough.
I’ve included a link to a connection guide for the various Gxx specs
G98, G99 and G100 Explained: The Complete UK Grid-Connection Guide
A practical engineering guide to G98, G99 and G100 for solar PV, battery storage, generators and V2G in Great Britain—including DNO applications, protection, export limitation, commissioning and a worked PV+BESS example.
This device is an intelligent device which has the ability to
1/ Charge the batteries (100 amp max capability)
2/ Invert from the batteries to 240V
If this wa a dumb device then yes a limitation in one direction would also limit the ability in the other direction. As this an intelligent device then there is no reason why it has a limitation in the charging direction.
More to the point when working with a G98 code what have I actually got in terms of charging and onverting over above say the 4K5 unit?
I also note that there is a post earlier in the year 14/Feb/2026 where the person is also experiencing problems albeit on a larger scale!
You can work out if it is the Muktiplus or the batteries? How long is since you have fully charged the batteries as they need a regular full charge to balance
I have changed the schedule to ensure that batteries are fully charged on a Saturday night - now that there is less sunshine. The batteries are set to fully charge tonight and I should be able to get the necessary information indicated in your post.
Although I export little to none it looks like I will need to fill out the paperwork for G99 which will I can update the inverter to a G99 grid code.
This is probably the fiest time that inverter has been required to “Fully Charge” the batteries givan the sunshine over the summer and not using much electricity for the house. I have now set the schedule to chage to 100% limited by the number of hours. Today there is a free 1 hour slot from Octopus and the weather is predicted to be sunny.
So it is definitely the multiplus that is limiting the charge and not the batteries.Looks like the G98 code as that is the only difference to mine which is running on G99.
I currently don’t fully charge the batteries as there is still plenty of sunshine. I have grabbed the data from yesterday / this morning which shows charging and charge limits
