V2G - maybe the next article will be similar but Vessel (not vehicle) to grid

[Neeves]

The downside is that it increases the number of charge/discharge cycles, reducing the battery's lifetime.

I think it was Geem or Sea Change aka Kelpie who linked to 'Mainsail' (aka ???) and 15th anniversary of his Lithium bank, Happy 15th Birthday to my LiFePo4 Bank - Cruisers & Sailing Forums. One take away from Mainsail's work is that we don't know what LFP battery life is - there are simply insufficient data points, basically its all too new. It seems we have been extrapolating from LA batteries and Mainsail's experience is saying that underestimates LFP performance, though his is only one data point.

A question then is - is a 15 year life, and no end point yet, acceptable.

Being mocked - I don't mind, I have a thick skin - and in this case I feel a degree of vindication, but don't wallow in my vindication.

There is a developing under utilised resource, solar powered lithium battery banks on yachts - this has been addressed with vehicles, is it so difficult, technically complex, to better use the resource available in yachts retained in a marina?

I might be, I am, influenced by the number of Lithium threads which may not be representative of the opportunity.

Jonathan

 

[AntarcticPilot]

I think it was Geem or Sea Change aka Kelpie who linked to 'Mainsail' (aka ???) and 15th anniversary of his Lithium bank, Happy 15th Birthday to my LiFePo4 Bank - Cruisers & Sailing Forums. One take away from Mainsail's work is that we don't know what LFP battery life is - there are simply insufficient data points, basically its all too new. It seems we have been extrapolating from LA batteries and Mainsail's experience is saying that underestimates LFP performance, though his is only one data point.

A question then is - is a 15 year life, and no end point yet, acceptable.

Being mocked - I don't mind, I have a thick skin - and in this case I feel a degree of vindication, but don't wallow in my vindication.

There is a developing under utilised resource, solar powered lithium battery banks on yachts - this has been addressed with vehicles, is it so difficult, technically complex, to better use the resource available in yachts retained in a marina?

I might be, I am, influenced by the number of Lithium threads which may not be representative of the opportunity.

Jonathan

We do know - part of the development cycle of batteries is an assessment of capacity remaining after a specific number of charge/discharge cycles. About 80% of capacity after about 800 cycles is regarded as good.

Sorry, I can't give chapter and verse; once again I am bound by non disclosure conditions, especially as some of what I see is commercially sensitive. But the degradation over charge/discharge cycles is part of the standard assessment of Li based batteries; much research is going into extending it.

 

[Ian_Edwards]

It's an interesting discussion, people are thinking about the possibilities, problems and restrictions, which I think is really good sign.
The sailing community will eventually move to relying less on diesel and that will happen, as the technology develops and the cost come down.
I think that most of the technology need to implement boat to grid is already available.
The system I installed in 2020 syncs to the grid or the generator and will reinforce the AC supply, from the batteries, if it comes close to the maximum current the AC supply can provide. That's only a short step away from allowing the export of energy.
I think the outstanding problem have more to do with the Marina management and the utility company.