u/__g_e_o_r_g_e__

Moving from estimate to full survey stage. Initial estimate was for a Midea. I've asked if Vaillant is an option and it is but haven't confirmed costs yet. What are the best heat pump options for home automation / home assistant? I'm pretty clued up with traditional central heating control (basically CH and HW demand, couldn't be simpler), what do I need to additionally consider for heat pumps? My main aim will to be to dynamically mange scheduling, primarily to fit around smart tarrifs and battery/solar. But I understand inverter control (pump power), defrost, flow temp monitoring will also need to be monitored and potentially managed. I would prefer something that doesn't reliant on cloud - ethernet/modbus being the gold standard for me. Does anyone have some success stories they can share? I don't want to end up with a heat pump that either gives no control, or I have rely on some silly cloud subscription. Or can I just rely on old fashioned call for heat and everything will behave?

I'm not missing something obvious am I? There's no EMS mode or clean solution that prioritises PV export to grid first, and only charges the battery when the grid export limit is hit ? Such that I can manually force the battery to remain at a low SOC ready to soak up excess PV generation above the export limit? Something like "command export first". Seems like an oversight.

My home assistant workaround of dynamically tweaking the grid export limit during command discharge PV, is not ideal!

Having a play round with Heat Punk ahead of recieving my first quote. Do small variations in the flow temp make a stark difference in practice? Heat Punk seems to indicate the COP difference between 45 and 50 degrees for most pumps is only about 10%. Is the impact on performance a lot worse in reality? I predict acheiving 45 vs 50 degrees will involve much more cost and visual impact from additional radiators (not just in place upgrades).

Also, I want to stick to IOG or similar tariff (cheap night rates for EV) and use battery (will be upgrading to 18KWH) where possible to minimise consumption on the day rate. (I currently do this for 100% of household usage). Is anyone successfully managing this? Heat Punk is estimating 6.9KW heat loss for the house.