u/muffinman8519

I have a Sigenergy SigenStor battery system with a gateway installed for backup.

Last night my house power went out twice. The battery was sitting at around 5% at the time. I later realised I had changed the settings so that both Backup SOC and Discharging Cut-off SOC were set to 5%, which probably explains why the battery didn’t actually carry the house during the outage. Basically, there was no usable reserve left once it hit the discharge floor.

What I’m more concerned about is the logging/alerting side.

Because the house power went out, my router and network also went down. I do have 5G backup internet, but obviously that doesn’t help much when the network gear itself has no power. So I understand why I may not have received a push notification at the time.

But I expected the Sigenergy app to show somewhere afterwards that the grid had gone offline, or that the system attempted to go into backup but couldn’t because the battery was already at the discharge cut-off.

Instead, the only alerts I can see are two short “Communication fault / Gateway communication abnormal” alerts around the outage times. I can’t find anything obvious saying:

• grid offline
• grid failure
• off-grid mode attempted
• backup unavailable due to low SOC
• battery at discharge cut-off
• gateway failed to transfer

Is this normal behaviour for Sigenergy? Does the app not expose those grid/off-grid events to the user, or should I be seeing a proper grid outage record somewhere?

I’m trying to work out whether this is just because the internet/network dropped during the outage, or whether the gateway/app/system should still have locally recorded the event and synced it later once everything came back online.

Interested to hear from anyone with a SigenStor + gateway setup who has had real outages or done a controlled backup test.

I’ve run into a bit of a design limitation with my Sigenergy setup and curious how others have solved it.

My SigenStor stack is installed outside under a pergola (which I actually think was the right call by the installer), but it’s roughly ~7m away from the carport. Once you factor in the way the DC cable has to route down and out of the stack and then back up, you realistically lose a couple of metres straight away.

From what I can tell:

The DC module only comes in 5m, 7m, or 10m cable options

And 10m is basically the max supported length
Which means depending on where the charge port is on the car… I’m right on the edge (or over).

The frustrating part is even if I tried to go down a custom route, I don’t think it would physically fit anyway once you account for routing, bends, and slack. So it’s not just a “buy a longer cable” problem.

I’ve also spoken directly with Sigenergy about this:

They confirmed they don’t offer longer cables because voltage drop becomes too large

I asked whether they’d consider a DC wall outlet / pass-through system (so you could run your own compliant cabling through the house and terminate closer to the carport)

They said it was an interesting idea and something they’d consider for future products

I’m trying to future-proof for V2H/V2G because that’s honestly one of the main reasons I went Sigenergy in the first place. The idea of using the EV as part of the home energy system is too good to miss just because of physical layout.

So I’ve got a few questions for people who already have this setup:

Has anyone exceeded the 10m limit in any way (extensions, custom cabling, etc)?

Did the system accept it or just refuse to operate?

Has anyone relocated or repositioned the module after install to make it work?

Any creative solutions? (running through walls, conduit paths, mounting tricks, etc)

Or did you just give up and go AC charger instead?

I’ve seen one example where someone drilled through a wall and routed the cable through just to make the reach work, which is kind of where my head is going too, but even so I don’t think the route would make a difference.

Right now my options seem to be:

Try to engineer a better cable path

Relocate hardware (painful)

Go AC charger and lose V2H (feels like a waste long term)

Keen to hear what others have actually done in the real world.

I’ve recently installed a Sigenergy system and noticed a consistent discrepancy between the app and my utility smart meter.

Over ~2 weeks:

Sigenergy import: ~0.03–1.05 kWh/day

Smart meter import: ~0.6–1.7 kWh/day

So there’s a pretty steady gap of ~0.5–0.8 kWh/day where the smart meter is always higher.

This looks like a constant ~20–30W load over 24h (~0.6 kWh), which makes me think it could be system self-consumption (inverter, gateway, BMS, etc.) that isn’t being reported in the app.

Questions:

Has anyone else seen this with Sigenergy?

Does the system exclude its own consumption from “grid import” stats?

Could this just be CT inaccuracy at low loads?

Or does it point to something wired outside the gateway?

Everything in the house should be behind the gateway, but I do have a grid bypass/main switch setup.

Would appreciate hearing what others are seeing in real-world installs.