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G4IJL > FUEL 13.02.11 23:03l 71 Lines 3561 Bytes #999 (0) @ WW
BID : AF0150G4IJL
Read: GUEST
Subj: Re: G4IJL > Fuel cells etc.
Path: DB0FHN<DB0MRW<DK0WUE<DB0RES<ON0AR<HS1LMV<CX2SA<ZS0MEE<VE3UIL<GB7COW
Sent: 110213/2103Z @:GB7COW.#44.GBR.EU #:44225 [240834] FBB7.01.35 alpha
From: G4IJL@GB7COW.#44.GBR.EU
To : FUEL@WW
> I'm rather at a loss in what you say since it's unclear and not the way
> either of us learned it. If I had some idea what they mean by "secondary
> fuel cell" it might sit better, then maybe not. The way I learned it is a
> primary cell generates electricity from a chemical reaction and a
> secondary cell uses two reactions (charge and discharge) to store it...
> right? IMO fuel cell and secondary cell are a contradiction in terms.
Its an easy answer. It looks like a single unit, but under the mess of
plumbing you find a fuel cell and also a separate electrolysis cell. Oh
and a fine bunch of wires and dedicated computer to switch valves in the
plumbing and relays to switch the power. So put electricity into the
combination unit and it makes hydrogen and oxygen from water. The gasses
are stored. To get electricity back drain the power. The voltage bus drops
a little and the unit stops the electrolysis and starts the fuel cell. OK
it is complicated but it is two units in one. Highly expensive and exotic
as a battery. It has a very high per unit cost. It knows from its computer
set up low bus voltage go fuel cell, high bus voltage go electrolysis. I
suspect this would be rocket science as they would need a thing like this
some time in the future.
> Right, gel batteries are finicky things, I never got one to last as long
> as I'd like. Most are those 12V 7.5AH "bricks" but one year I spotted a
> 100AH NIB monster at a hamfest and after considerable struggle used it as
> backup power for the shack. I don't know where I go wrong but I never get
> more than a couple of years out of these things. Then again I know your
> secret, a solar charger is a "smart" charger and it can outhink either of
> us. (;->)
A car battery runs at a charging voltage of 13.8, that gives best
performance. An alarm gel battery runs at 13.2 up to 13.5 volts that is in
the charging mode. The gel cell charger also has a form of current
limiting. The wet cell can tolerate higher charge currents but also should
ideally be limited. For my gel cell I use 13.8 volts on a timed run with
that in mind now you know how I get 10 year old gel cells. You need to
limit all aspects of the charging voltage, current and time. Oh and never
- never - never leave the battery with anything but full charge for more
than a couple of days. The crystals' of lead sulphate change crystal
structure over time and then you need to re-crystallize the lead plate in
a battery recycling plant. To us take to the scrap yard and buy a new
battery. Also note a solar panel is not a mains supply. The voltage sags
on load when power is taken out. Yes my solar charger is smart, it has two
chargers in one. A trickle charger and a bulk charger both set by a bus
voltage sensor. The switchover to bulk charging has a pot you can set up
as wanted voltage limit.
> "Have you got the bunker ready?"
> And they cried unto the mountains saying fall on us and protect us from
> the wrath of the Lamb.
> Nah, look for the candle I'll light as a beacon.
And the sky and stars rolled up as a scroll - How do you describe the
Andomida galixy on near collision with us. Yes it will hit us at around
the time the oceans boil off with the red giant phase of our sun. Time to
impact 4.5 billion years. For the other people we are quoting Revelations
in the bible.
73 - Paul, G4IJL @ GB7COW
Message timed: 20:40 on 2011-Feb-13
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G4IJL located IO92KX
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