25-02-2025, 08:47 PM
(25-02-2025, 01:39 PM)harm_less Wrote:(25-02-2025, 01:13 PM)nzoomed Wrote: Yes thats a good point, especially given that fossil fuels are not considered a renewable fuel, its really just on the scale of a human lifetime that they are not when they take at least tens of thousands of years to millions of years to form.V2G is on its way as latest version of the AU/NZ electrical standard 4777 is being rolled out now in Aussie and here this year which includes V2G functionality. The energy stored in an EV battery is typically ~400V DC so that needs to be converted to grid voltage to be used domestically. V2L, and some V2H, enabled EVs do this through their onboard inverter while others allow DC output that is then converted by a bidirectional EVSE 'charger'. The manufacturers of EVSEs are currently hurriedly developing suitable bidirectional chargers as a result of the demand coming as the V2G standards are adopted.
V2G is a great option for a home battery, providing the car is available when you need to use that energy. I see that the returns from energy retailers varies dramatically, many dont want to credit you back in cash either, hopefully you can strike a good deal with Octopus.
I take it that you must have a high voltage DC inverter if you are considering V2G. Higher voltages also allow more efficiency and thinner cables, etc, plus there are a ton of cheap surplus EV batteries available from wrecked cars now that make a great second use as a solar bank.
The amount of energy required to power a home is small compared to most EV battery capacities so easy to 'pinch' a bit of it without hindering EV mobility. Even better if the EV in question is a second vehicle.
Newer electricity suppliers such as Octopus and Ecotricity are paying good tariffs for exported generation as a way of building a stable of customers with solar capacity as their own distributed 'power station' which insulates them to some degree from the volatility of NZ's wholesale electricity prices. For us the FIT is 1.5c short of our night supply rate with Octopus but in some regions the inverse applies which make for a great incentive to ramp up solar capacity.
Yes, I dont believe we are far behind either, I work for a fella who is working with the regulatory bodies for establishing this standard here, it will probably happen later in the year is my guess.
IIRC i remember reading an article that Nissan was looking at adding V2G with the leaf, I could be wrong, but I had the impression they were doing this.
I hope we dont see a situation like is happening in parts of Australia where energy companies are penalising those who put power into the grid if its deemed they are producing too much.
We need all the solar we can get, I consider it a good problem to have if there is too much surplus energy, but I can see that the grid has not been designed to cope with this, there probably needs to be more batteries installed to the grid unless more homes get their own battery/EV to store the power..