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What about running 5 6V SLA batteries in series to get a 30V power source? I noticed that the 6V SLA betteries seem to have a higher maximum current than the 12V. The 12V don't get much higher than 15A for any sustained period, while the 6V double this - is this extra current with the 6V batteries a problem when powering on the unit (will the soft-start circuit be able to handle the 6V batteries?)?
Is there such a thing as NOT fully charging an SLA battery?
I would like to know if LiFePO4 Li-Ion rechargeable batteries would do the trick. Obviously, I would welcome anyone with any experience of using this later technology to give their views.
Vinnie,Thanks, very interesting .So basically, from what I can gather from your extensive answer is a LiFePO4 pack with a PCM is a no go because of a too variable voltage range, however, would employing a full smart charger improve the outcome?Isaac
Vinnie, Sounds like you are doing a sales job on me (Actually, I've got your Black Lightening page bookmarked already ). I've spotted a mistake in my previous post, should read: "full-time smart charger", , i.e. having the pack under constant low current till cut-off. Anyway, this is what I have found, with the TWO.2 in mind (may be a pair of employing 2 packs). http://www.batteryspace.com/lifepo426650battery384v68ah26112wh30aratewithpcm.aspx
While LiFePO4 cells have a shutt-off voltage of under 3V, isn't this battery chemistry more resiliant (and even more responsive) to limitting discharge to way before this occurs. Looking at discharge curves, it seems that these shutt-off voltages are achieved suddenly and that most of the discharge life of these cells occur above 3.4V to 3.5V.So, besides the high cost of these cells, LiFePO4 may actually work well.
The second question is that I have read that charging batteries in series will result in an uneven voltage charge between batteries. Is this a sonic problem?
Finally I would like to ask the Virtue staff what the power connection is on the back of the Virtue 1.2.
Also, a note regarding Lithium cells. Some Lithium cell chemistries (ie, LiCoO2, LiMnNio4) seem to have a nominal voltage of 3.6V while (newer?) LiFePO4 cells seem to have a nominal voltage of 3.2V - which is what Vinnie was obviously referring to. Sorry for the confusion
Still the issues of 33.6 V peak voltage and the potentially low cut-off as menstioned by Vinnie.
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