Transformer T240 [RE-wrenches]

[Travis Creswell]

John,

Since it is "fairly large system" why don't you look at a dual inverter
system?  Of course a T240 or comparable transformer is quite a bit cheaper
but if the budget allows it, a dual sure solves a lot of problems.  How is
this customer pumping water?

How many other of you do dual inverter systems?  On what percentage do you
do them?  We use them most of the time but most of our jobs are small family
full time residences with little workshops, have wells over 200' deep and we
usually have over 10 kW generators.


That is a very small generator for a SW4048.  Assuming you use the T240 you
might get something like (3900 watts/120v) 32.5 amps.  The battery charger
is going to soak all of that up and leave 2.5 amps to pass through for other
loads.  You'll have around 33 - 37  kwh of storage depending on which type
of L16 you use.  30 amps (4048 Charger Rate) x 115 (the voltage that a small
generator might get pulled down to at full load) v x .7% charge efficiency =
~2400 watts  Assuming 50% DOD then you have around (37 kWh * .5) = you have
18.5 kWh to get back in the batteries but of course you aren't going to
charge them back to 100% with the generator.  16 kWh / 2.4 kW = around 7
hours to get the batteries back to around 80% full which assume you charge
at full rate the whole time by not running any loads in the house.


Everyone please check my math and tell me different if you don't agree with
my numbers.

Travis Creswell
Ozark Solar
----------
>From: cvsolar at aol.com
>To: RE-wrenches at topica.com
>Subject: Transformer T240 [RE-wrenches]
>Date: Thu, Mar 23, 2000, 9:21 AM
>

>Hi all,
>    I am quoting on a fairly large 48 vdc wind/solar off grid system with 16  
>L16P Batteries.  I am planning to use a Yamaha EF4600 generator and am 
>wondering if feeding the 240 from the generator into a T240 to balance the 
>generator and get more than the 20 amps available in the 120 socket would 
>make sense.  I want to minimize generator run time and with the large battery 
>bank, it should be able to use close to 25 amps at 120 v to get the 60amp dc 
>charger output on the SW4048 and I also need more for the pass through to run 
>the house loads.  Has anyone used the balancing transformer?
>
>John Blittersdorf
>Central Vermont Solar and Wind
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