u/Ayrix87

I noticed that the print head cable was being squeezed by the print head cable fixture, so I installed a thin PET braided sleeve around the cable for some extra protection.

However, when I reassembled everything, I found that the screw for the print head cable fixture no longer tightens properly. It only goes in far enough for the fixture to hang loosely on the screw instead of being firmly secured.

I uploaded a video showing exactly what I mean.

Has anyone experienced the same issue?

• Is this normal?
• Did I miss something during reassembly?

I’d really appreciate any advice before I start modifying anything. Thanks!

Hi everyone,

I'm having a strange and very reproducible issue with my Marstek Jupiter C Plus together with the Marstek CT002 Smart Meter.

My setup:

• Marstek Jupiter C Plus
• Jupiter firmware: V142
• CT002 firmware: V124
• Communication module: 202409090159
• Auto Mode using CT002
• Three-phase sum (A+B+C)
• Excess feed-in enabled

The problem:

Everything works normally while the battery is charging and discharging.

However, as soon as the battery reaches 100% SOC, at some point the system stops feeding power into the house/grid. Even when there is household consumption and the battery is full, the Jupiter remains at 0 W and does not start discharging again.

The really interesting part is:

I can immediately make it work again by either:

1. restarting my Wi-Fi router, OR
2. running the Smart Meter / Auto Diagnosis in the Marstek app.

After doing either of these, the Jupiter immediately starts responding to the CT002 again and discharges normally.

This makes me think that it is not a battery/BMS or hardware problem, but rather some kind of firmware/communication issue between the Jupiter and CT002. Maybe the connection or control state gets stuck when switching from full-charge/excess-feed-in mode back to normal Auto Mode operation.

The system worked correctly with an older firmware version. Marstek support unfortunately has not responded to my requests for a downgrade.

Has anyone experienced exactly the same behaviour?

I'm especially interested in:

• Does your Jupiter C Plus also stop discharging after reaching 100%?
• Which Jupiter firmware version are you using?
• Which CT002 firmware and communication module version are you using?
• Did a firmware update/downgrade solve it?
• Has anyone received a newer firmware from Marstek support?
• Did updating the CT002 communication module solve the problem?
• Is anyone using CT002 communication module 202506141125 together with a Jupiter C Plus?
• Did changing Wi-Fi/router/mesh settings permanently solve it?

Any experience would be really helpful. I'm trying to figure out whether this is a V142 firmware bug, a CT002 communication issue, or a combination of both.

Thanks!

Hi guys I have just bought a kobra s1 and noticed a weird sound when printer is moving in positive XY direction. In negative XY direction is no noise. Is that normal?