u/muffinman8519

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.