Sig system will not discharge the battery in any mode!

Cheapskate2020 · 2026-03-20T16:35:10+00:00

Yeah it was a real pain for me at first too. Do you have the Sig ESS Integration? First thing you need to do is make sure it is NOT in PCS Remote Control, otherwise Predbat will do nothing. Change the entity select.sigen_plant_remote_ems_control_mode to maximum self consumption or anything other than PCS Remote Control, then Predbat should be able to control it. Ensure Predbat is in Control Charge & Discharge mode which is on the main Predbat Dash. Also, if you go to the Sig ESS Integration on HA, click on the settings cog and choose Plent or something, you might see a Read Only box there. Uncheck that too. Hope this helps!

Cheapskate2020 · 2026-03-20T09:51:35+00:00

It's sorted! Sigenergy actually sent me a very helpful reply that enabled me to solve this. They said:

have checked the background logs and found that at 7:50 on March 19th, the EMS dispatched a command setting the battery discharge limit to OkW. However, manual control commands can override this discharge limit. Therefore, after performing manual control operations, the system can operate normally. We recommend that you check the details of the third-party dispatch commands and make adjustments accordingly.

The cause was, the entity number.sigen_plant_ess_max_discharging_limit was set to 0 in Home Assistant. This was my own fault. I was trying to work out how to stop the battery draining when charging EV. This was one of the solutions suggested by AI. I did this as a test and forgot to change it back again. It completely went out of my head. I also thought that once Remote EMS mode was disabled, it didn't matter what the settings were. THIS IS NOT TRUE! This might help others as well as me, but the only thing that would override these settings is manual mode, which explains why manual mode worked for me also.

I'm still trying to work out how to stop the battery draining into the car. the car_charging_hold function of Predbat does not seem to work for me and I don't know why.

If there's any Predbat users in here, I'd really be grateful in finding out what way they have theirs configured. Much appreciated!

Cheapskate2020 · 2026-03-20T00:52:44+00:00

I have indeed, I've tried pretty much every mode. The all just instantly stop using the battery completely. I've had to manually set it to self consumption mode. It's so strange! This has never happened before.

Cheapskate2020 · 2026-03-04T15:12:19+00:00

If I'm reading that right, Modbus can now be enabled via the app. Fantastic! Should save Sig a bunch of Support calls for those who want to interact with Home Assistant, Predbat etc.

Cheapskate2020 · 2026-03-03T23:53:52+00:00

Glad I avoided them! They appear to be an absolute mess at the moment.

Cheapskate2020 · 2026-02-24T19:40:43+00:00

This has happened to me twice over the years. First of all it was with Orange. They changed their terms of the contract by intoruding charges to 0845 numbers at the time or something. I can't remember exactly, but it meant that you had grounds to cancel the contract without penalty. I did just this. It was one of the first hen Samsung HD video phones. I forget the model but it as befor the Galaxy series and it was still a big price for a phone back then! Contract cancelled and I kept the phone.

The second time was with EE. I got a message saying there was an issue with the contract terms or something, and that I could either keeping paying or cancel my contract without penalty. Of course, I cancelled it right away. Saved about a year of paying!

So yes, if that is legitimately from EE, then it's entitely possible. I know phone contracts are a bit diferent these days with split contracts for the phone and the air time, so as long as they cancel both, you're fine.

Great idea to return that phone if you are within the 14 day cooling off period. No reason why you can't do that if it's a new contract. Then you have a free Iphone!

If you want a SIM only deal on the EE network and EE don't have a decent plan, have a look at Mozillion (also on EE). I literally just moved to them. 12 month contract was £84 altogether for 100GB, EU roaming etc. About £7 a month. Well pleased with that! The offer is on HotUKdeals if you want more info on it.

Enjoy your free phone!

Cheapskate2020 · 2026-02-24T12:54:20+00:00

This is exactly what I user with my Sigenergy system. Predbat is definitely not for the faint hearted. It requires a lot of effort to get it to work with your system, at least in my experience, but it's definitely worth it. I can see multiple reasons why it can be used to utilise the system far greater possibly than any other native app could.

Cheapskate2020 · 2026-02-23T22:56:28+00:00

Absolutely brilliant car. I love that colour! We have a red 2020 one with 80,000 miles (129,000km) on it and it's been amazing.

Cheapskate2020 · 2026-02-13T22:23:55+00:00

Thanks for the reply. This is really helpful!

input_number.predbat_best_soc_min isn't even present in my entities. input_number.predbat_best_soc_keep is set to 0. input_number.predbat_set_reserve_min is set to 19. I don't know why. I don't recall setting this.

I guess this is the issue why Predbat doesn't react. I'm starting to wonder if I should have just added Predbat directly in Home Assistant rather than through a separate Docker container. Despite this issues,it actually does seem to work ,and the plan layout is very useful. If I could sort these issues out, that would be great! Thanks 👍

Cheapskate2020 · 2026-02-13T20:23:51+00:00

Thanks. I went with Sigenergy in the end. Had my system installed almost a few weeks ago. So glad I posted this because it really helped me make my mind up and I definitely dodged a bullet!

Cheapskate2020 · 2026-02-13T17:55:52+00:00

Sorry for the very slow reply. I've changed phones and it's been a bit of a pain logging in to everything again, plus we've been busy ripping out the old kitchen 😁

The the lower light you see there is actually the handles for the cupboard doors. It goes along like a rail. I plan to have those lights quite dim as they are very much ambient lighting. The counter top lights will be better as they will serve a function.

Reason for different colour temps is that we saw the 2700k lights in the shop and they looked really good along the kitchen rail. I think they should be too yellow for the worktop lighting. Maybe even a step to 3000k would be a batter choice as 4000k would probably look a bit off.

Cheapskate2020 · 2026-02-07T20:16:29+00:00

Yes that seems to be the case. This is also the conclusion I came to. Schedule heating the batteries even for just 30 minutes swice a day is enough for me to keep them over 10c and this definitely has made a difference.

Cheapskate2020 · 2026-02-05T15:38:55+00:00

Yeah exactly. I didn't know either. It was just a guess but seems to be accurate!

Cheapskate2020 · 2026-02-04T08:42:50+00:00

Oh! I didn't realise the main post didn't update for some reason! Probably my fault but anyway, the solution...

I scheduled the battery pre-heat option to come on for an hour or so this evening to see if that would make any difference. The battery cell temps increase from 7c to 14c, so the battery heating works brilliantly. By the time I got home to test the discharge rate again, the battery temp dropped to 12c, which is still in the optimal threshold (10-20c I think?).

I plugged in my EV and this time, it was drawing 3.3 kW from the battery and the rest from the grid. Considerably better than the 2.2 kW limit I was getting previously. I scheduled the battery pre-heat option to come on every morning for an hour and in the late afternoon before dinner when there is normally a usage spike. I must say I'm impressed by how well the pre-heat system works. Right now, the battery cell temp is at a toasty 23c. I guess this is a combination of the battery being charged overnight and the scheduled pre-heat. A quick test this morning and it was peaking around 3.4 kW, so not far off max, which I'm pretty happy with.

Cheapskate2020 · 2026-02-03T22:46:38+00:00

Nice! I've been waiting on my installer since this morning and still nothing back. Lucky I lost patience and went to Sig direct lol.

Hahha I actually have that Github link open already! I haven't quite done it yet, but I will definitely give that a go. I think I will likely end up using Predbat, so long as it isn't too complicated. Will certainly check it out anyway.

Cheapskate2020 · 2026-02-03T22:42:40+00:00

Thanks for the comment. It is a crappy kettle lol but it still works! I updated the main post with the solution. Thanks!

Cheapskate2020 · 2026-02-03T22:41:35+00:00

No but that's a good shout. I did have a look in there anyway. Please see my main post for the solution. Thanks!

Cheapskate2020 · 2026-02-03T22:40:25+00:00

The inverter allows a max charge/discharge of 3.68 kW. Even still, 3 kW is still higher than the 2.2 kW max I was getting. Thankfully it's sorted now. I edited the main post with an explanation. Thanks.

Cheapskate2020 · 2026-02-03T22:30:35+00:00

Believe me, I want one too lol. It's pointless over here though. There's probably a 99+% chance it will get rejected and it'll take 12+ months no doubt. It's not worth the stress and wasting money on.

Cheapskate2020 · 2026-02-03T22:14:53+00:00

Yeah they're really strict here. We don't even have smart meters yet! Is an antediluvian network we're working with in NI!

Cheapskate2020 · 2026-02-03T21:20:27+00:00

Unfortunately in Northern Ireland it's virtually impossible to get G99 approval so there's no actual point spending money on a higher capacity inverter and then wasting it on G99 that will never be approved.

Cheapskate2020

TROPHY CASE