Shop type battery chargers [RE-wrenches]

[Bob Ellison]

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>From past experience a standard battery charger takes a LONG time to charge
a battery bank due to the taper charge profile. What happens is as the
battery banks voltage rises the charger tapers off, by the time the voltage
rises to 14 / 28 volts the charge has tapered to under 50% of max. This
results in it taking an extremely long time to get to full charge and a lot
of gasoline used. The higher the voltage gets the less amps are fed into the
battery. This is considerably different that the standard 3 stage charge
profile most inverters use.
Plus whatever is being used from the battery into loads subtracts from the
total charge. Remember there is no transfer switch. So if you are feeding in
20 amps and using 10 you are really only charging the battery bank at 10
amps total.
With a large battery bank it will take forever to get a full charge.

Good night,
Bob

-----Original Message-----
From: Jay Peltz, Peltz Power [mailto:jay at asis.com] 
Sent: Saturday, March 25, 2006 3:25 PM
To: RE-wrenches at topica.com
Subject: Re: Honda inverter / generators with off grid [RE-wrenches]

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Hi Todd,

I do think its ingenious, just complicated.

Given that the genny is probably an inexpensive model and the customer
doesn't want to spend the extra money for a seldom used item, I still think
that a regular battery charger would be much simpler ( and probably
cheaper) than the method stated.

For example a 40 amp 48v IBE industrial charger can be gotten for around the
same price as the system Darryl designed and it would be much more reliable,
and its off the shelf.

Just my 2 cents,

jay

peltz power

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