Quote:
Originally Posted by Davydd
As for the 14 deg. F. discharge temperature of the Valence batteries I think the key statement is, "From personal experience, I know that people who live in those places will be prepared for the cold." The paper was prepared by Fred Ahlgren, a northern Minnesota native. Plus, ARV makes provisions and capability to keep the batteries above the optimum 41 deg. F. at all times for all their systems. So, it is really not inconvenient if you design for it.
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Actually, I think the key statement is
you can't use your batteries if they are below 14 deg F. That counts as an inconvenience. I agree that it is a tolerable inconvenience.
It doesn't matter how prepared Mr Ahlgren is for the cold. The fact is that if a van has been in long term cold storage without shore power, it is not possible to "keep the batteries above the optimum 41 deg. F." The ARV white paper says as much. Starting up under these conditions would entail an inconvenience. An acceptable (for me) inconvenience, but an inconvenience none the less. I do not store my van with continuous access to shore power, and I do not desire to. It would not be convenient.
As I said, this chemistry would require extra provisions for heating the battery from either shore power, a lead-acid battery, the engine, or a genset, and it would have to work
without either using or charging the Li batteries. This can certainly be done, but it is most certainly an inconvenience.
Personally, I think it is both possible and useful to admit that a system can be good without insisting that it is perfect.
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