You might want to have a look at how the telecommunications industry
supplies high current DC. Yours is a small load from their
perspective. They have some pretty advanced charging systems from the
perspective of control, diagnostics and communication. Typically this
type of equipment is rack mount design. The biggest drawback is they
don't equalize batteries much in Telecom and in our application we
do, but in combination with renewables this can be overcome.
Best regards,
Ezra Auerbach
DragonSun Consulting
On 28-Sep-09, at 11:57 AM, Mark Dickson wrote:
Hey there Orion,
I had Quick Charge build a custom charger for us before and it has
been working great. They can build just about anything you have in
mind. We bought ours through Derek @ IBE batteries.
Otherwise I believe the best solution is the one you mentioned,
just have the Genewreck power loads directly through a x-fer switch.
Best regards,
Mark Dickson
Oasis Montana Inc.
From: [email protected] [mailto:re-wrenches-
[email protected]] On Behalf Of Orion Thornton
Sent: Monday, September 28, 2009 12:43 PM
To: 'RE-wrenches'
Subject: [RE-wrenches] Battery Charger
Wrenches,
We recently installed a grid-tie battery backup system using two
Outback GVFX 3648 inverters. The client has an existing Generac
backup generator, 8 kW @ 240VAC. From the beginning we told the
client that the power quality from the Generac may not be within
tolerance to integrate with the grid-tie inverters and charge
batteries. This assumption was confirmed today when we
commissioned and tested the system. The output frequency of the
Generac was 58 hz.
To get to the point does anyone have a battery charger they
recommend for this application?—8 kW @ 240VAC generator output to
48VDC battery bank. Or maybe another suggestion to be able to
integrate the generator into the system, we are also planning on
manually transferring the generator output to power the critical
loads if an inverter goes down.
It also seems that the dc genset controls through the mate would be
the best way to control the battery charger—any thoughts?
Thanks in advance for any input.
Orion Thornton
Project Manager
Independent Power Systems
NABCEP Certified PV Installer
(W) 406.587.5295
(C) 406.249.9912
www.solarips.com
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