I love that Aus/US term "weed eater" :)
Back on topic... my 2p worth...
The safety will depend largely on the quality of the socket you are connecting the granny lead into, rather than simply age of house.
If you are planning on using a granny charger for any length of time, then I'd...
Intrigued what you meant by 'max battery allowable'? FWIW there is no mandatory limit on home energy storage capacity. There is a 'recommendation' under BSI PAS-63100; that is 40kWh within a dwelling or 80kWh if outside, or in detached garage/outbuilding.
I disagree.
We are in a similar situation to that of @NikLiverpool. We have a sizeable solar and battery system which has a payback period of sub four years for house energy usage, excluding EV, which we didn't have at the time of the solar installations.
We got our first EV in March and...
IMHO a 5 mins break every 200+ miles (so that's about 3 to 4 hours depending on traffic) is not a safe strategy for you to reach those that you want to spend quality time with. That's why commercial drivers are regulated to take a break of at least 45 mins per 4.5 hours driving time. But...
No... BMS's normally use coulomb counters to calculate change in charge levels. They only use voltage to reset/recalibrate to 100% when a full charge results in cells or the pack reaching a pre-defined maximum voltage.
You can't use voltage as a measure of state of charge because, as you say...
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