Transformers at other voltages and Frequencies [RE-wrenches]

[Rick Cullen - RV Power Products]

oops, just realized I discussed SB3048... Input and other issues are the
same for the SB6024H charging a 24V battery.

Rick

----- Original Message -----
From: "Rick Cullen - RV Power Products" <rick at rvpowerproducts.com>
To: <RE-wrenches at topica.com>
Sent: Monday, August 04, 2003 4:47 PM
Subject: Re: Transformers at other voltages and Frequencies [RE-wrenches]


> Daryl,
>
> The SB3048 can handle up to 24A of Isc (30A/1.25 for NEC) from what could
be
> thought of as a conventional 48V input (~4x17V=68Vmp @25C) at ambient
> temperatures of up to 40degC without derating. Higher input voltages can
be
> used, but current must be reduced to maintain an equivalent maximum input
> power. Technical bulletin #100210 available on our web site explains this
in
> more detail.
>
> This means that at 120V input, input current would be need to be reduced
> substantially. You would also want to look at the "Input Power Sources
Other
> Than PV" section of the operators manual regarding other criteria the
power
> source must meet. Something has to determine at what voltage the input
would
> operate at and our voltage sampling and difference MPPT method could work
> well with a generator type input. It's hard to say for sure without
knowing
> it's exact electrical characteristics of the generator.
>
> The problem however is that the inputs of multiple SB3048's cannot connect
> in parallel as you describe so SB3048's cannot be used in the "single big
> generator" system you are contemplating. In a PV installation each
> controller must connect only to it's section of a large array.
>
> In a large multi-controller system, units can be setup in a staged manner
> controlling the full charge point as a function of net battery current via
> an external shunt. Technical bulletin #100202 also available on our site
> explains this in more detail. This multi-controller method works but is a
> little messy to set up. Our new IPN based products will make
> multi-controller systems integrate seamlessly together.
>
> Richard A. Cullen
> RV Power Products, Inc.
> 760-597-1642 x102
> Fax 760-597-1731
> mail; rick at rvpowerproducts.com
> www.rvpowerproducts.com
>
>
>
> ----- Original Message -----
> From: "Daryl Thayer" <daryl_solar at yahoo.com>
> To: "re Wrenches" <RE-wrenches at topica.com>
> Sent: Monday, August 04, 2003 12:10 PM
> Subject: Transformers at other voltages and Frequencies [RE-wrenches]
>
>
> > Thanks to everyone for prevcious help.
> > If I first rectify this wind machine, I will have
> > about 120 volts at 150 amps DC.  For 18 kW max.
> >
> > Can I use an Outback MX60 or RV Power Porducts charge
> > controllers in parallel to charge my 48-volt, 2400-Amp
> > hr battery set?  Each controller can handle a max of 3
> > kW or 25 amps at 120 volts. I would of course use from
> > a min of three to max of six controllers.  If I used
> > three controllers, I would need some way to control
> > the field to reduce current at the max of 75 amps or 9
> > kW.
> >
> > My questions are: 1) I want to use the MX 60 or RV 60
> > or other product to control the battery charge
> > coondition and act as a dc to DC (120 to 48
> > nom.)converter.  I do not want the MPPT function to
> > try to follow the wind generator. Is this possible.
> >
> > 2) I want the MX60 or RV60 or other product to work in
> > unison as a single unit.  Not for one to hog the load
> > and the others to lie back, as happens in one of my
> > solar control systems.
> >
> > 3) I would like the MX60 or RV60 or other product to
> > work off a smart shunt, to decide if the batteries are
> > near full and to replace this charge.  Concern is when
> > the wind blows hard the controllers think the
> > batteries are full when they are still charging.  Then
> > the wind stops and the wind does not blow for a long
> > time to complete the charge.
> >
> > Thanks again Daryl
> > daryl_solar at yahoo.com
> >
> > __________________________________
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> >
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