First look
" ..I´m really surprised at your numbers on LiFepo4 vs Lion NMC."
...
(Edit) Right .. saw it...
You take same total power, and then compare the mass/cost.
Yes.
I more/less agree with your numbers, except that in the real world, the
Lion cycles/lifetime are much more favourable than Your numbers re: AGM.
By about double, or 100% better.
Likewise, cycle depth is somewhat tilted /very little)..
By your numbers, AGM batteries deliver 136 £ / Nm, and Lion NMC 187 £ / Nm.
In the real world, by all reports I know of, == the same.
This might also be an artifact of the costs You used and all Your
numbers are spot-on !
But the lion (NMC) is more "risky", and needs a BMS more, to avoid issues.
Fwiw..
Boat engine rooms are usually /typically very hot in use (bigger boats).
Boats are often very hot when not in use (in Spain/warm climates), or
very cold (Finland, UK, etc..).
Re-cap (mine):
Typical retail marine lion offers today retail == 700€ / kWh.
== 100 Wh/kg, give or take.
Typical best solution DIY options are about 2-3 x cheaper new..
Typical lion usable energy/cost is about == same as any other technology
available today, 6/2017, be it AGM or lead.
This ratio is about to flip, likely this year, latest next year.
Because electric scooters/bikes/motorbikes make available huge numbers
of semi-industrial products at very low mass-produced costs/unit of
performance delivered.
On 27/06/2017 12:13, 66b6dcd5b59507e7d751ea81382ea1f6 wrote:
> Hi Myles,
>
> Indeed, this was the point of my post and in my asking Hannu's
> knowledge of 'non boat' batteries. I agree re heat as we deal at such
> low loads compared to cars. Taking your reply a bit further, I just
> put this attached spreadsheet together for a boat that cruises at 4
> knots using 1,000 Watts of battery power in calm conditions, for 4
> different battery scenarios, all with similar ranges and battery cycle
> and calendar lives. Wh/Kg and volume are for the packs.
--
-hanermo (cnc designs)
Posted by: Hannu Venermo <gcode.fi@gmail.com>
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