I found GE to be a bit weird with some of the settings when setting it to force charge.
How to getthe best out of Octopus Flux
- Thread starter Ron-ski
- Start date
Something I've also considered with this is that potentially if you have the option to install more westerley facing panels to favour the 4-7 peak period as this will no doubt always be the peak of the day for electric generation so likely to have higher export rates in future.
Set my Victron system to charge to 60% and it did just that, thought it was going to be a bad day, but now at 100% and exporting at 4kw
Soldato
Alright so I tried to take into account how some solar generation might impact the different tariffs based on todays rates.
Global settings:
Summary:
Once again just highlighting what I already knew. Flux gets better the more you generate. the 20kWh isn't the excess generation beyond usage figure, that is 20kWh generated total. It's also not miles worse even if you only generate a little.
8kWh generation is about the time all 3 start getting very equal, by 10 it's the best option.
Eco7 is actually pretty competitive unless you have an EV or way more battery storage, but lacks the generation payments.
Illustration of how the figures are calculated at 20kWh:
(Regular Cost) - (Peak Units negated) - (Exported Units)
Flux = ([Regular cost] £4.25) - ([Peak Units negated] 12.6 * £0.3423) - ([Exported Units] 7.4 * £0.2439)
£4.25 - £4.313 - £1.804 = £1.87
For Go and Eco7, the Peak Units Negated caps out at the same value as the Imported Peak units (5.8 and 3.7 respectively) and after that all go to export.
Think I'm done with my calc stuff don't want to spend more time on it!
Global settings:
- 0.7kWH per hour house demand on average
- Daily home consumption of 16.8kWh (24 * 0.7kW)
- 8.2kWh battery
- 2.4kW max charge/discharge
- Battery is always charged off-peak as far as the max charge rate will allow in the off-peak window
- Flux battery is held at a certain SOC % until it can discharge some units later on (in my case probably 75% would do).
- Flux export price for additional exported units is always standard rate not the best peak rate beyond the initial 5.1kWH exported
- Flux avoids using import in the most expensive peak window
- Go and Eco7 both just hold the battery at 100% until end of off-peak window, then allow battery to power the home
- All 3 tariff options first use excess solar to lessen the cost of peak rates, and then export only if that count is met.
- No accounting for round trip losses still.
Summary:
Once again just highlighting what I already knew. Flux gets better the more you generate. the 20kWh isn't the excess generation beyond usage figure, that is 20kWh generated total. It's also not miles worse even if you only generate a little.
8kWh generation is about the time all 3 start getting very equal, by 10 it's the best option.
Eco7 is actually pretty competitive unless you have an EV or way more battery storage, but lacks the generation payments.
Illustration of how the figures are calculated at 20kWh:
(Regular Cost) - (Peak Units negated) - (Exported Units)
Flux = ([Regular cost] £4.25) - ([Peak Units negated] 12.6 * £0.3423) - ([Exported Units] 7.4 * £0.2439)
£4.25 - £4.313 - £1.804 = £1.87
For Go and Eco7, the Peak Units Negated caps out at the same value as the Imported Peak units (5.8 and 3.7 respectively) and after that all go to export.
Think I'm done with my calc stuff don't want to spend more time on it!
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@HungryHippos are you able to share your spreadsheet please?
Soldato
I'll DM you a link to it
Some stuff I've put in formulas, others I've sort of hard-coded, but feel free to take a copy and edit it to improve on it.
I'm not sure, I kind of took the no solar/worst case scenario figures as the baseline, and considered that any solar generated either a) lowers peak consumption and/or b) allows for additional export, both of which can be calculated separately. So you could work out expected average solar export per day in any given month and it would give you a rough idea.
General idea of charge off-peak, and run the battery flat by the end of the day as well, which is once again into worst case scenario territory.
For me I think Flux will probably lose it's effectiveness somewhere around September sort of time, and will only re-gain it again somewhere around April, so a good 6 months when it makes sense, but I also have to weigh this up against the fact that my Go is at a better rate than the current Go tariff is.
Soldato
Octopus Flux export is now live........
Did you do anything, mines still not updated?
Soldato
i didnt do anything, but they paid me out my last load of export and it then switched to the flux outgoing.....around 10mins ago
but the export rates are lower than originally stated in the postcode verification on the site.....by a few pence
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Are they still higher than the import in the cheap window?
Soldato
yes.....but marginally
Octopus just told me via Twitter that it can take 6-8 weeks to complete export registration 
.
I wasn't registered with them for export, so I guess it could take longer than someone who already was.
.I wasn't registered with them for export, so I guess it could take longer than someone who already was.
Soldato
Octopus just told me via Twitter that it can take 6-8 weeks to complete export registration
I wasn't registered with them for export, so I guess it could take longer than someone who already was.
Slacker!
I am already with them for export so should be simples for me
Same, just need to be with them for import. Going to give it a couple more weeks then move over I think.Slacker!
I am already with them for export so should be simples for me
It's not me, it's them, will probably turn into another 20 week fiasco like getting the smart meters fixed.
Soldato
when i put my export documents to them in october it took around 10 days to get sorted and i was on smetz1 meter then too, but still half hour readings
Man of Honour
I've been moved to export. Rates are great. 24p and 38p 
Soldato
yours are a little higher then mine then......i get 22.97 and 36.85. so lets say 23 and 37. its odd that we dont all get the same export rate thoughI've been moved to export. Rates are great. 24p and 38p
Same as all costs, vary by the DNO pretty much as they all have different underlying infrastructure costs.