Situation:
Requirement:
I’ve investigated Charge HQ however is unable to accommodate this Western Australia specific constraint unfortunately (they can deal with export limitations not total inverter limitation on an oversized system).
I’m leaning towards either the following options:
Inputs appreciated.
- I’m in Western Australia and our energy provider restricts our inverter output to 5kW (this is TOTAL output of the inverter including home and grid export - yes crapola).
- I’m planning a large solar system (circa 13kW of panels) + single Powerwall 3 + EV (not Tesla, most likely VW product) and EV charger (not Tesla, most likely a Zappi).
- Standard charging behaviour is to fully charge PW3 battery and after battery fully charged to use excess solar power to go into EV charger/EV using EV charger CT placed on the side measuring power flowing to the grid.
- Problem with this approach is that PW3 will have charging priority first and will be fully charged by mid/late morning given my oversized solar system for most of the year (sunny climate).
- Issue is that late morning to early afternoon solar generation power curve will reach over 5kw for ~9 months of the year (up to circa 9kW in my setup in summer) and I'll be wasting that excess solar after battery has charged even with full 5kW household (including EV charging) based on the total 5kW inverter output restriction.
Requirement:
- I want to be able to delay/restrict PW3 charging to around these midday peak generation curve hours so I can maximise EV charge rate throughout the solar window - this will ensure one (and maybe even second EV in future) is fully charged by excess solar vast majority of the year.
- I’ll need single PW3 battery fully charged by 3pm to coincide with energy provider’s peak time of use period. During three or so months in winter, standard PW3 Time Based Control should be fine as unlikely to be generating much over 5kW peak solar generation and will need to partially charge PW3 from grid during cheap grid consumption period (9am-3pm).
I’ve investigated Charge HQ however is unable to accommodate this Western Australia specific constraint unfortunately (they can deal with export limitations not total inverter limitation on an oversized system).
I’m leaning towards either the following options:
- Setting fake PW Time Based Control rate settings to manipulate charging behaviour as has been talked about in some forums.
- Doing something with Home Assistant (still to research)
- Doing something with NetZero (still to research)
Inputs appreciated.