Absolutely none in my case, in fact its quite the opposite, we'd just got used to putting the dishwasher and washing machine on when the suns shinning, but now I charge the battery every night it doesn't matter, and once the additional battery is installed in a few weeks we won't have to worry about using too much either.
- Charge battery off peak (maximum charge circa 24kWh, 8kw x 3 hours)
- Solar tops battery up to full - capacity circa 29kWh
- Excess is exported at more than we paid per kWh to charge the battery
- Discharge some at peak rate, but keep some back to see us through to 2am and in case of a power cut.
- Repeat the above
I haven't yet tried Solcast, I came across an integration for Victron Node Red which uses Forecast.Solar and modded that, but may try Solcast, but given my use case as above its not really needed now.