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Home > Archive > Alternative Power sources > August 2005 > 80 amp DC-DC charger?
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| Author |
80 amp DC-DC charger?
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| Robert Morein 2005-08-14, 2:21 am |
| Looking for an 80 amp 24V DC-DC charger.
The biggest Xantrex makes is a 60 amp.
Suggestions?
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| Scott Willing 2005-08-15, 11:21 am |
| On Sun, 14 Aug 2005 00:30:05 -0400, "Robert Morein"
<nowhere@nowhere.com> wrote:
>Looking for an 80 amp 24V DC-DC charger.
>The biggest Xantrex makes is a 60 amp.
>
>Suggestions?
You don't really mean DC-DC do you Robert?
Presumably AC-DC? Otherwise is 24V the input or the output voltage?
(Or both, in which case I'm *really* confused. :-))
-=s
>
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| Robert Morein 2005-08-15, 12:21 pm |
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"Scott Willing" <NOTwilling2BSPAMMED@mts.net> wrote in message
news:oh71g110cpnh93irgnev8e5uf10b9s06c7@4ax.com...
> On Sun, 14 Aug 2005 00:30:05 -0400, "Robert Morein"
> <nowhere@nowhere.com> wrote:
>
>
> You don't really mean DC-DC do you Robert?
>
Input around 28VDC from a surplus NATO 2KW tactical generator.
Xantrex does make these things, featuring a very low minimum voltage drop.
But only up to 60 amps. Acch!
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| Derek Broughton 2005-08-15, 12:21 pm |
| Scott Willing wrote:
> On Sun, 14 Aug 2005 00:30:05 -0400, "Robert Morein"
> <nowhere@nowhere.com> wrote:
>
>
> You don't really mean DC-DC do you Robert?
Why not. I use one.
> Presumably AC-DC? Otherwise is 24V the input or the output voltage?
> (Or both, in which case I'm *really* confused. :-))
I have a Trace C35 24VDC charger for my 24V batteries and my 24V solar
system. Of course, the true voltages are 20-30V on the battery side and
28-34V on the PV side.
If you really want an 80 charger, though, why not just split your inputs and
use two 40A chargers? Then you've got redundancy.
--
derek
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| Robert Morein 2005-08-15, 2:21 pm |
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"Derek Broughton" <news@pointerstop.ca> wrote in message
news:ncn6t2-ji8.ln1@othello.pointerstop.ca...
> Scott Willing wrote:
>
>
> Why not. I use one.
>
>
> I have a Trace C35 24VDC charger for my 24V batteries and my 24V solar
> system. Of course, the true voltages are 20-30V on the battery side and
> 28-34V on the PV side.
>
> If you really want an 80 charger, though, why not just split your inputs
and
> use two 40A chargers? Then you've got redundancy.
> --
> derek
I have one generator and one battery bank. Are you suggesting simply
paralleling two chargers?
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| William P. N. Smith 2005-08-16, 12:21 am |
| "Robert Morein" <nowhere@nowhere.com> wrote:
>Input around 28VDC from a surplus NATO 2KW tactical generator.
Ah, so you are looking for a charge controller, yes?
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| Robert Morein 2005-08-16, 2:21 am |
|
<William P. N. Smith> wrote in message
news:8nk2g19hjavn5c28i1gthptc53o4ugf0h4@4ax.com...
> "Robert Morein" <nowhere@nowhere.com> wrote:
>
> Ah, so you are looking for a charge controller, yes?
Correct.
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| Derek Broughton 2005-08-16, 10:21 am |
| Robert Morein wrote:
>
> "Derek Broughton" <news@pointerstop.ca> wrote in message
> news:ncn6t2-ji8.ln1@othello.pointerstop.ca...
> and
[color=darkred]
> I have one generator and one battery bank. Are you suggesting simply
> paralleling two chargers?
Yes. IANAelectrician, so maybe there's a reason why I shouldn't be doing
this, but I've had parallel charge controllers to my battery bank for two
years. They're not even identical, since one's a Trace C35 from the PV
panels and one's integral to the wind turbine, but it doesn't seem to cause
any problems. It would seem to me that two identically configured 40 or
60A chargers should work fine.
--
derek
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| JoeSixPack 2005-08-16, 10:21 pm |
|
"Derek Broughton" <news@pointerstop.ca> wrote in message
news:mr19t2-j08.ln1@othello.pointerstop.ca...
> Robert Morein wrote:
>
>
>
>
> Yes. IANAelectrician, so maybe there's a reason why I shouldn't be doing
> this, but I've had parallel charge controllers to my battery bank for two
> years. They're not even identical, since one's a Trace C35 from the PV
> panels and one's integral to the wind turbine, but it doesn't seem to
> cause
> any problems. It would seem to me that two identically configured 40 or
> 60A chargers should work fine.
> --
> derek
Could you not use a smaller charge controller and couple it to a relay that
could handle 80 amps?
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| Robert Morein 2005-08-17, 4:21 am |
|
"JoeSixPack" <olegp@telus.net> wrote in message
news:BKvMe.184419$HI.38610@edtnps84...
>
> "Derek Broughton" <news@pointerstop.ca> wrote in message
> news:mr19t2-j08.ln1@othello.pointerstop.ca...
inputs[color=darkred]
doing[color=darkred]
two[color=darkred]
>
> Could you not use a smaller charge controller and couple it to a relay
that
> could handle 80 amps?
>
No, charge controllers for lead acid batteries provide microprocessor
controlled voltage/current ramps that are dynamically determined by the
microprocessor while charging. It is not an on-off control situation.
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| Scott Willing 2005-08-17, 7:21 pm |
| On Mon, 15 Aug 2005 10:57:38 -0400, "Robert Morein"
<nowhere@nowhere.com> wrote:
>
>"Scott Willing" <NOTwilling2BSPAMMED@mts.net> wrote in message
>news:oh71g110cpnh93irgnev8e5uf10b9s06c7@4ax.com...
>Input around 28VDC from a surplus NATO 2KW tactical generator.
>Xantrex does make these things, featuring a very low minimum voltage drop.
>But only up to 60 amps. Acch!
Gotcha, sorry.
I've been subconsciously programmed to think "charger" = AC/DC,
"charge controller" = DC/DC, but of course there's no such rule.
I hope the gennie is actually capable of more than 28V, otherwise you
might as well hook 'er up and let 'er rip. 2kW @ 28V will never charge
a 24V bank fully anyway, much less equalize it.
Probably a conservative rating though?
I have this terrible feeling that I'm missing something. Again.
-=s
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| Robert Morein 2005-08-25, 9:21 pm |
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"Scott Willing" <NOTwilling2BSPAMMED@mts.net> wrote in message
news:f3c7g1ha0emiop4v84ll0rbddvnkqat8f1@4ax.com...
> On Mon, 15 Aug 2005 10:57:38 -0400, "Robert Morein"
> <nowhere@nowhere.com> wrote:
>
drop.[color=darkred]
>
> Gotcha, sorry.
>
> I've been subconsciously programmed to think "charger" = AC/DC,
> "charge controller" = DC/DC, but of course there's no such rule.
>
> I hope the gennie is actually capable of more than 28V, otherwise you
> might as well hook 'er up and let 'er rip. 2kW @ 28V will never charge
> a 24V bank fully anyway, much less equalize it.
>
> Probably a conservative rating though?
>
> I have this terrible feeling that I'm missing something. Again.
>
> -=s
The generator is adjustable 27-31 volts.
However, this particular battery, an AGM "Powersafe" by Hawker Energy
Systems, specifies strictly constant voltage charge, no "bulk" or
"accumulate" mode, and never equalize.
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