Peak vs off peak competition (March 2025)

[Will]

So, for those wondering, if you have your grid pressure setting to export slightly and avoid making silly mistakes, you can get a bill like this before solar credit, which makes it free for 9 months of the year.

Nearly 2000 kWh to 14 kWh off-peak vs peak!

I believe the remaining 14 kWh is the electric hob as it clicks on and off so the battery has to respond. I'm going to switch it out for an inductive hob, which is more consistent. That or I just made a mistake at some point during the month.
Month bill

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Typical day view, keeping all use to the off-peak rate.

[reef]

We managed this in April-May:

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This is on a H1-5.0-E, so no grid pressure setting is available. Instead, it's just using Feed-In First from 05:30 to 20:30, force exporting from 20:30 to 23:30 and force charge between 23:30 and 05:30.

Pretty much all of that peak rate usage is from our 8kW electric shower.

I'm looking to move the batteries from the loft to the garage soon as I'm not keen on 164kg being up there long-term (6x HV25). I'm thinking a KH9 will suit us well and also allow going up to 8 HV25s aswell. We'll be in the bizarre situation at that point of having a H1, KH and F series inverter.

[Will]

nice!

[WyndStryke]

633.2kWh off-peak versus 0.1kWh peak

This is with grid compensation turned to -30W export, a 7kW inverter (versus house load which never goes over about 5kW), and I have force-discharge set at 400W for the two minutes before and after the overnight tariff change (just in case the smart meter clock is out of step with the inverter clock).

* Force discharge 23:58-0:02 400W
* Force charge between 0:02 and 6:58 about 2kW (set dynamically to hit 87% or 100% at 06:55 depending on whether it is a calibration day, it's usually within 1m of the target time except on calibration days when it is a bit unpredictable)
* Force discharge 6:58-7:00 400W
* Feed in first from 7:00
* Force discharge from about 20:00 to 23:58 2-3kW (set dynamically to hit 17% or 10% at 23:55 depending on whether it is a calibration day, it's usually within 1m of the target time)

I was running at 99.8% off-peak and 0.2% peak, prior to changing the grid compensation setting in March, so this is an improvement. However, I suspect that summer will always be better than winter, because if there is PV export or battery export, it would offset any spikes from things like turning the kettle on/off.

[Will]

Nice results!

I've just achieved the following in May 1,169kWh to 4.1kWh off peak vs peak. 4kWh peak still feels like I can optimise something.