Mark,
The first step has to be to choose a battery system that stores the
right amount of energy for the job to be done. If it is a 24-volt
battery system, it'll have twice as many amp hours as a 48-volt system.
The fact that the 24-volt inverter has twice the charger rating means
the charge rate (C/X) that the batteries see is the same either way.
Considering that lots of parallel strings of batteries is trouble
waiting to happen and that a 48-volt system is more efficient, except
for the smallest systems 48-volts is usually the way to go.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 1/17/2012 9:20 AM, Mark Frye wrote:
OK,
But let's assume only one string, how important is it to develop a higher
bulk charge current?
Mark Frye
Berkeley Solar Electric Systems
303 Redbud Way
Nevada City, CA 95959
(530) 401-8024
www.berkeleysolar.com
-----Original Message-----
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Kent
Osterberg
Sent: Tuesday, January 17, 2012 9:16 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] 24 vs. 48
Mark,
A 24-volt inverter may produce twice as much charging current as a 48-volt
inverter with the same power rating, but if you are putting batteries in
parallel, the individual batteries get the same charging current either way.
In the case of four parallel strings of four L16 batteries, a 100-amp
24-volt charge puts about 25 amps (if you are careful with the wiring and
the batteries aren't sulfated) into each string of batteries. A 50-amp
48-volt charger would accomplish the same thing.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
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