I also have a solar hot water system, which means in summer I hardly ever have to heat my cylinder using electricity. In winter it needs a top up most nights unless we have a couple of sunny days in a row. But again, this electricity top-up is scheduled to happen at 4am during the cheaper rates.
I have a delay timer on my dishwasher so I try to ensure that only ever runs after 9pm. I don't have this on my washing machine unfortunately, but the next one I buy will definitely have it.
I am very interested to hear how others use/monitor their electricity usage. The old man has just built a new house (earthquake rebuild) and he has opted to install solar PV cells on the roof. In his situation I think he is probably better off running his underfloor heatpump during the day, to make sure of the solar gain when it is available. But ideally he needs a smart home automation system to monitor the PV panel output and only turn on the underfloor heating when it is generating enough to make it worthwhile.
This is the sort of thing you can get very clever with. I.e. schedule a dishwashing/washing machine load when you leave home in the morning and have your 'smart home' monitor the PV output and turn on the appliances when there is enough juice being generated. This is a far more efficient use of electricity than pumping it back into the grid, getting reduced rates, and then using full price electricity in the mornings/evenings when you have no solar (as already mentioned).