Solis Feed in priority to limit clipping

System · 17-06-2024 11:45AM #1

This discussion was created from comments split from: Domestic Solar PV Quotes 2024 - No PM requests - See Mod note post #1.

graememk · 17-06-2024 10:49AM

https://www.boards.ie/discussion/comment/122267398#Comment_122267398

https://www.boards.ie/discussion/comment/122267574#Comment_122267574

Success it works. We are off track enough as it is, any replies will be moved to another thread.

This is for people who are oversized and have a battery.

Set operation mode to feed in priority, and set export limit to 5kW, maybe a little less to allow for house load but a bit of trial and error to come into account here.

Solis will export to 5kW. It will only charge the battery with excess power that it can't export eg export 5kW and possibly put 2kW into the batteries at peak sun if 7kWp of panels are connected.

The way I tested this, I was generating 1.2 kW.

Put in feed in priority mode, set export limit to 500w. House load was 200 w.

I exported at 500w, house took 200w, battery took 500w.

In feed in priority mode, the battery will discharge, but doesn't charge until the export limit is reached.

THE ALM · 17-06-2024 11:09AM

https://www.boards.ie/discussion/comment/122268904#Comment_122268904

Can confirm same.

Have been running it this way for the last week or so to see how it goes before I make a few tweaks.

Would have been clipping at about 6.3kW (Solis 6kW before the new regs came in)and will now hit the peak of 8.16kW when it needs to charge the battery with the excess being exported.

conor_mc · 17-06-2024 12:09PM

Very interesting, thanks for providing the results of your experiments @graememk and @THE ALM.

What are your thoughts on how to best utilise this though, with say a 5kWh battery? Seems it might be a summer setting (where usual house load is comfortably met by generation), and then revert to ploughing as much generation as you can into the battery over winter?

THE ALM · 17-06-2024 02:18PM

https://www.boards.ie/discussion/comment/122269220#Comment_122269220

Yeah, probably looking at summer or when peaks start running over the 6kW in any meaningful way. If I know there is a good day ahead I'll look to dump the battery (9.6kWh) early and then charge it up during the day and still be exporting the 6kW.

conor_mc · 17-06-2024 02:46PM

Any thoughts about how to prevent the battery from depleting on a grey day, other than reducing the export limit value manually?

Also, I don't see an Export Limit field under Work Mode > Feed In Priority Mode. Am I looking in the right place?

Model is S5-EH1P5K-L, Inverter Version (presumably this is the firmware version) is 440040.

graememk · 17-06-2024 06:47PM

https://www.boards.ie/discussion/comment/122270055#Comment_122270055

export is on the right hand side of the advanced settings somewhere, its a separate setting. If you cant find it i'll go look again.

olympicweights · 09-07-2024 07:45PM

I have a 15kWh battery which is charged overnight and I don't need it to be topped up by solar during the day. So obviously I'd prefer to export any generation.

If the inverter is set to Feed in Priority am I correct in thinking that if there is demand for power from the house i.e. electric shower then it will import from the grid instead of pulling 5kW from the battery when in this setting?

graememk · 09-07-2024 08:02PM

Feed in priority will discharge the battery as needed.

It will only charge the battery from solar if the inverter has reached it's AC output (eg 5kW) but the solar has the potential to produce 6kW, then 1kW will go to the battery.

It will charge via a timed charge too

olympicweights · 10-07-2024 04:08PM

Is there a setting that will prevent the battery from charging as above?

olympicweights · 10-07-2024 05:22PM

Looks like it's doing what it should now. Battery at 95% and surplus solar being exported and not charging the battery.

Battery setup might need to be tweaked to prevent the charging at near full (99%+) as seen above.

NurseBridie · 04-05-2025 10:47AM

https://www.boards.ie/discussion/comment/122360323#Comment_122360323

Interested in this as I have an oversized system. So know how to enable it but confused by the time of use charge/discharge settings and time slots.

graememk · 04-05-2025 06:21PM

https://www.boards.ie/discussion/comment/123416584#Comment_123416584

Depending on what you want to do.

If just export as much and put the excess into the battery, select the feed in priority mode and leave the charge/discharge timers all at 00:00

TimHorton · 15-02-2026 03:02PM

https://www.boards.ie/discussion/comment/122268904#Comment_122268904

Excellent Posts , Clipping in mid Feb ! Pulling in over 7kw from 8.9 Peak System… Will be great come the longer days , Likely to be discharging for 4 hours a day either side of charging from 2AM to 5AM.

mjatkey · 15-02-2026 04:14PM

Surely if you run your inverter as Feed In Priority with a not completly charged battery, you could push 5Kw into the grid and maybe 2-3Kw into the batteries with the Solis 5K, plus of course the house load?

TimHorton · 15-02-2026 05:43PM

I changed 1 setting - Max Export set to 5000w, Before this change I was clipping at 5.5 kw !…

dessertspoon · 15-02-2026 09:52PM

I am set to Feed In Priority and have my max grid export set to 6000W and it exports up to the AC inverter limit of about 5.7kw. If the solar array is generating more than that the rest goes to the battery.

Was yours operating differently?

TimHorton · 16-02-2026 08:37AM

https://www.boards.ie/discussion/comment/124239196#Comment_124239196

Before setting Export Limit to 5000w my PV was topping out at about 5500w , As soon as I set it to 5000w PV hit 7,300w !

mjatkey · 16-02-2026 09:34AM

https://www.boards.ie/discussion/comment/124239637#Comment_124239637

Ah, so you are saying once you changed your export limit to 5Kw your panels produced more? Not sure why that would be what model inverter is it?

dessertspoon · 16-02-2026 10:47AM

https://www.boards.ie/discussion/comment/124239637#Comment_124239637

That sounds like a bug!

What was the export limit set to before?

TimHorton · 16-02-2026 10:53AM

https://www.boards.ie/discussion/comment/124239822#Comment_124239822

It was blank/Zero.

dessertspoon · 16-02-2026 10:56AM

https://www.boards.ie/discussion/comment/124239848#Comment_124239848

Try setting it to 6000W and see if it operates as expected; export to 5.7 and send the rest to battery.

TimHorton · 16-02-2026 11:05AM

https://www.boards.ie/discussion/comment/124239860#Comment_124239860

Will do

micks_address · 16-02-2026 02:44PM

you guys have nc7 approval for export over 5kw?

dessertspoon · 16-02-2026 02:59PM

https://www.boards.ie/discussion/comment/124240389#Comment_124240389

The NC6 limit is 25A which is 5.75kw. The Solis S5 has a max AC output at 25A making it compliant.

SteelyDanJalapeno · 16-02-2026 04:01PM

I think there's some confusion in the thread,

I don't think anybody is over exporting, and I don't think it's a fw bug.

Some users are setting their priority to export until it reaches 5kw, them at that stage start topping up the battery aswel so it uses that additional energy for the battery instead of losing it to clipping.

The 5kw output limit is ac, your inverter can charge your batteries in DC, so it's a good way to earn a few more pennies, handy feature

dessertspoon · 16-02-2026 04:33PM

https://www.boards.ie/discussion/comment/124240643#Comment_124240643

A user above reported their inverter to be clipping (not directing excess to battery) with the max import set to 0W. That doesn’t sound like intended behaviour? (hence my bug accusation).

olympicweights · 17-02-2026 03:55PM

https://www.boards.ie/discussion/comment/124238496#Comment_124238496

Just revisiting this thread, screenshot from June below. And my Backflow power setting is set at 0000W

KevIRL · 03-03-2026 06:28PM

Can this be done on Sigen inverter?

Solis Feed in priority to limit clipping

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