Node that compares max and min price

[Heddan76]

It would be nice with a node that compare max and min price. And if the difference is bigger than x öre output 1 activates.

I use my battery for pricearbitrage and Lowest Price-node for charging at lowest price and discharging at highest price of the day. But its only worth doing this if the difference between max and min price is more than 80öre. Because of taxes, wear of the battery and so on...

With this new node it would be possible to choose differerent saving strategys from day to day based on how volatile the electrice price are the next 24 hours.

[ottopaulsen]

Interesting idea. Let me elaborate. So let us use Output 1 for spending from battery. Send true to start spending and false to stop spending. Then let us use Output 2 for charging the battery. Send true to start charging and false to stop charging.

The algorithm would analyse a period the same way as Lowest Price does. It will start by finding the costliest and the cheapest hour. If the price difference is >= x it would charge the cheapest hour and spend the costliest hour. Then it would find the next costliest and the next cheapest, compare them and do the same with those. When the difference is < x it would do nothing. Both outputs would be false both hours and for all remaining hours.

What other config would be required?
I guess a maxHoursPerChargingSequence and a maxHoursPerSpendingSequence would be useful. If one of those limits are reached it would stop searching for more hours, as it would then risk to start charging on more expensive hours and be done charging before the cheapest hour comes, and similar on spending.

It could also calculate a saving for each pair of hours.

This algorithm assumes that spending and charging takes the same amount of time. That may not always be the case. Maybe some kind of configuration is necessary for handling that too. This would make it more complex, but it is probably possible. Maybe a chargeDischargeRatio or hoursChargingPerHourSpending.

Does this make sense?
My immediate thought is that it sounds possible.