Good day All

ive got 2x 5kva inverters that was installed a few years ago running 4x 200amp agm batteries

ive just replaced them with 2x new gen volta stage 1 batteries now ive noticed that its not sharing or splitting the load and the master does the work and the slave charges the batteries

what setting did change that did this as it was working before i set it to user

Menu 02:80A; 05:USE; 11:80A; 26:56: 27:54; 32:AU33

Have you turned on the second inverter ?

Usually the small switch under the unit on the right hand side? This turns on the inverting mode?

Otherwise if the inverter is connected to batteries and or mains, and has PV power it will turn on and only charge the battery, and night when the PV is off it will turn off completely if no mains supply, to the second unit.

hi

yes both are on.

ive also noticed some times the HS and SL switch around so from left to right and right to left might be after a while when switching the one off then back on

ive also looked it maybe the load it to low and put geyser on then it shows 75% switch 2nd geyser on then error on HS and reboots after 15sec or so due to over load

was working ok till gel batteries was removed and replaced with Lithium New gen Volta

checked settings on both inverters from 01 to 33 and they the same so thinking ive missed a setting some ware maybe from the watch power screen

not to sure whats the best settings for these inverters or does mine look ok from the pic

wanting to try get most off grid cost savings so only charges via solar

Edited October 27, 2025Oct 27 by Albert B

On 2025/10/27 at 9:09 AM, Albert B said:

ive also noticed some times the HS and SL switch around so from left to right and right to left might be after a while when switching the one off then back on

This not a problem. Often they switch positions. Normally the master is the first inverter to be powered on. The second became the slave. As @Arandoza said, check the power button first.

On 2025/10/27 at 9:09 AM, Albert B said:

ive also looked it maybe the load it to low and put geyser on then it shows 75% switch 2nd geyser on then error on HS and reboots after 15sec or so due to over load

Control the parallel cables, sharing cables and the 230V output wires. Normally the load should be shared between the two inverters. Attached you the shema of the wiring

On 2025/10/27 at 9:09 AM, Albert B said:

was working ok till gel batteries was removed and replaced with Lithium New gen Volta

Did you have checked the battery settings when your replace your batteries with the new ones ? Gel batteries and lithium batteries didn't have the same parameters.

13 hours ago, fhocorp said:

This not a problem. Often they switch positions. Normally the master is the first inverter to be powered on. The second became the slave. As @Arandoza said, check the power button first.

Control the parallel cables, sharing cables and the 230V output wires. Normally the load should be shared between the two inverters. Attached you the shema of the wiring

Did you have checked the battery settings when your replace your batteries with the new ones ? Gel batteries and lithium batteries didn't have the same parameters.

Hi, thanks

the only thing that was changed was the batteries from gel to Volta and then the settings on the screen shot in black

ive also tried to switch them on and off from the small switch bottom right and still the same. i didnt change any other wires and it use to work

when checking the settings or changing them must i only do it on the master and that will update the slave ? or on both

if i dont get them right ill try put them back on agm reboot and then back on user and redo all the settings again but wanted to avoid that for now

thanks

1 hour ago, Albert B said:

when checking the settings or changing them must i only do it on the master and that will update the slave ? or on both

Normally only on the master. The parameters are syncronised on the slaves.

1 hour ago, Albert B said:

if i dont get them right ill try put them back on agm reboot and then back on user and redo all the settings again but wanted to avoid that for now

If nothing works it is your last thing to do sir

Best Regards

According to the photo, slave inverter is not turned on. It's in solar charger mode aka Standby:

You have to turn it on, using the switch located on the bottom of the box:

19 hours ago, Youda said:

According to the photo, slave inverter is not turned on. It's in solar charger mode aka Standby:

You have to turn it on, using the switch located on the bottom of the box:

Hi

that's the strange part it looks like that but both are on, on that switch hence why i thought the slave is missing a setting to pull it out of standby

maybe the switch is switched around but i did try with it on and off on the slave no difference

Last thought is, are both inverters showing for menu 28 - PAL (for parallel use) ?? if you need to change this turn off the inverting of BOTH inverters before changing.

When paralleled, if settings changes are made, on either inverter, they should reflect to be the same on both master and slave, But i would manually check and verify this, as well.

Also assume you have one battery bank ( 2 x volta's) connected to both inverters so the inverters share the bank. Also that you are using the user defined battery setting on both the inverters ? or do the inverters understand the comms (canbus or serial data) from the battery bank? If your inverters have a lithium option they may not understand the battery bank, but this would cause issues more with charging than with one of the units not inverting? I would expect?