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MPPT - 55.8V array to 12V battery bank | 21 comments (21 topical, editorial)

Re: MPPT - 55.8V array to 12V battery bank (3.00 / 0) (#8)
by BigBreaker on Mon Aug 25th, 2008 at 08:20:21 AM MST
(User Info)

If the goal is to have the battery last forever get a Ni-Fe battery. With minimal care they will outlive the owner. In my opinion, that is more sensible than keeping dry lead acids on hand and unused. If civilization doesn't end and we all have a Mr. Fusion running in our basements... well the nickel in those batteries will still be worth a fair fraction of their original cost.

[ Parent ]

Re: MPPT - 55.8V array to 12V battery bank (3.00 / 0) (#12)
by scottsAI (user name at eml dot cc) on Mon Aug 25th, 2008 at 11:30:37 AM MST
(User Info)

BigBreaker,

Very good point!!
Not many suppliers of Ni-Fe batteries, may cost more than the over sized battery.
Remember to keep more electrolyte around to replace it every 10 years.

One slight down side to Ni-Fe battery is the charging efficiency is 80%, not changing over life nor state of charge (anybody know differently?). Another source suggests 70%.
Or should I say the efficiency is an advantage if you want to keep the battery topped off?

Have fun,
Scott.

[ Parent ]

Re: MPPT - 55.8V array to 12V battery bank (3.00 / 0) (#15)
by BigBreaker on Mon Aug 25th, 2008 at 02:35:54 PM MST
(User Info)

A bit slow to charge and discharge, not especially efficient but they certainly have a long cycle life even when fully discharged.

www.beutilityfree.com/nife.html is a source that imports them from China.

Most of the electrolyte is KOH with a dash of LiOH, so it wouldn't be too tough to store a lifetime supply as dry powder.

[ Parent ]

MPPT - 55.8V array to 12V battery bank | 21 comments (21 topical, 0 editorial)

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