C/5 - C/30 ? [RE-wrenches]

[Bob Ellison]

Most of the commercial chargers I have seen are taper chargers and their
version of an EQ charge is to hold the battery at the bulk charge voltage
for 3 hours or so every 5th charge. They are big and slow, they do not have
3 stage charging for fast charging with reasonable charge times like we use.
The 80 volts packs that I service regularly run up to 106 volts when
charging. Then taper off. You have to remember that they work the fork lifts
for an 8 or 12 hour shift or 2 of them, then generally charge the hell out
of them for 8 hours.

There are some high frequency chargers out there but so far I have not been
happy with their performance.
The sound they make is something else altogether.

Later,
Bob

-----Original Message-----
From: Jay Peltz, Peltz Power [mailto:jay at asis.com] 
Sent: Thursday, October 05, 2006 12:05 PM
To: RE-wrenches at topica.com
Subject: Re: C/5 - C/30 ? [RE-wrenches]


Hi All,

I think we must clarify what type of charger we are talking about.
PV or battery charger ( ie inverter/generator etc)

For PV, most people don't have enough to do a C/10 let alone a C/5 rate.
For generator, most systems I've seen again most people don't have C/ 10 or
C/5.
It takes a really big charging source to get to those rates.

One other point is that most chargers back off on current once the charge
voltage setpoint has been reached.
The only chargers that I know of that don't are  the big industrial units.

So I think the main issue is what Bob-O discussed which is do L-16's/
T-105's, need to be charged to high voltages ( 30v on 24v system) often?

My 2 cents is that I have found that the capacity of the battery is larger
the higher you charge the batteries
IE    29.5v vs 28.5v has been around 15-20% capacity gain.
But maybe this shortens the life?

However it would be interesting to get ahold of the charger that they use
for commercial charging of L-16's to see where they charge to, or for golf
carts?

Thanks,
jay

peltz power


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