more MX60 / generator charging [RE-wrenches]

[Kirk Herander]

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Hello John,

I am looking at this in order to establish a c/10 or better charge rate
when both the inverter's charger and the MX60/rectifier are powered by
the generator. At present the inverters charger maxes out at c/14 (45
amps). There is plenty of generator left (it's an 8.5 kw) to gain the 15
amps I need from the MX60/rectifier to establish a combined c/10 or
better from both sources, and plenty of headroom in the single MX60 for
both PV and genny/rectifier/MX60(it's a 48 volt system). So it depends
on how much current you need to make up as to whether the third inverter
(just for battery charging) is justified. I like this idea a lot as a
charger assist to establish the ideal charge rate you're looking for.
It's not just for small generators with poor waveforms.

Kirk Herander
Vermont Solar Engineering
802.863.1202
fax 802.863-7908
NABCEP(tm) Certified Solar PV Installer
Xantrex Certified Dealer Charter Member
NYSERDA-eligible installer
VT Solar and Wind Partner


-----Original Message-----
From: John Blittersdorf, Cent. VT Solar & Wind [mailto:cvsolar at aol.com] 
Sent: Saturday, April 22, 2006 10:33 AM
To: RE-wrenches at topica.com
Subject: Re: more MX60 / generator charging [RE-wrenches]


I think that once you are buying two MX 60's and two X240's to charge
from  a 
larger generator, it starts to look like just adding and FX inverter for

battery charging might be a lot easier.  We are looking at doing this in
grid 
tie installations with grid tie inverters.  A third FX on a quad  board
or 
second inverter when one grid tie inverter is being used on a  half rack
would 
deal with the generator backup and would also be a backup  inverter in
the event 
that the grid tie inverter had problems during an outage.  We are
planning to 
use a 2nd bypass toggle to allow AC out to the subpanel to be
selectable from 
the grid tie inverters or from the off-grid version.  Does  anyone see a

problem with this approach?
 
John  Blittersdorf
NABCEP Certified Solar PV Installer
Central Vermont Solar  & Wind, Inc.
104 River Street
Rutland, VT  05701

802-747-0577
802-773-0924 fax
802-770-8625 cell
_www.cvsolar.com_ (http://www.cvsolar.com/) 




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