Yeah, we have though about such things – maybe next time the shower needs replacing, we just couldn’t do everything at once!

The Eddi is good though – it just mops up the smaller bits of surplus solar and is most useful when the surplus is insufficient to charge the car (below 1.4kW). In that case the surplus goes to the hot water rather than being exported (we don’t get paid for any export so like to reduce export as much as possible!).

I have blogged about it before: https://www.alananna.co.uk/blog/2022/04/solar-utilisation/

Al.

We have a similar arrangement but use a Solar iBoost+ to divert surplus power when our batteries are full.

We have piping hot showers and no grid draw [except during off-peak boosts in the winter]

I may have to look at the Eddi though. Could you blog more about the system?