Transformers at other voltages and Frequencies [RE-wrenches]

[Rick Cullen - RV Power Products]

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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