battery voltage
-
Michael Martin
- Posts: 222
- Joined: Wed May 23, 2007 7:47 pm
battery voltage
To reinforce Jeff Saline's post which gave values for lead acid batteries, the following chart from a 1997 version of the Yuasa battery manual gives voltage versus state of charge for three types of battery construction:
Battery AGM CX and YuMicron Lead acid
Charge
100% 13.0v 12.7v 12.6v
75% 12.8v 12.5v 12.4v
50% 12.5v 12.2v 12.1v
25% 12.2v 12.0v 11.9v
0% 12.0v or less 11.9v or less 11.8v or less
More good battery info is available from the current edition of the manual at
http://www.yuasabatteries.com/pdfs/TechManual_2014.pdf
Usual disclaimers apply.
Mike Martin
From: Jeff Saline
To: bSwider@...
Cc: BSwider@...; DSN_KLR650@yahoogroups.com
Sent: Tuesday, April 22, 2014 7:39 PM
Subject: Re: [DSN_KLR650] Battery Voltage
On Tue, 22 Apr 2014 16:23:57 +0000 Bogdan Swider bSwider@...> writes: Recently I was trying to find out why my electric vest was not doing its' job - cold torso, cold heart .or is it ? Anyway .I got no reading from the connector running from the battery. To make sure my Harbor Freight meter ( I only use the best ) was working, I threw the meter at my van, a 2001 Toyota Sienna ( I only drive the best ). Over the years when taking readings from my motorcycle battery, I consistently get 12.8 or higher even if my ride sits for a while. The reading from my van was 12.25. Seems low to me but an auto wrench told me that's fine. My van starts right up.
Anyone know what's the story. Do cage charging systems keep their batteries at a lower voltage ?
Bogdan, curious in Colorado <><><><><><><><> <><><><><><><><> Bogdan the Curious, I'll suggest your meter is suspect along with the info from your auto wrench. This is some info that is for lead-acid batteries I got from someone maybe 8 years ago. You do need a digital voltmeter, the readings are at 70 degrees F and are for lead-acid batteries. You want to wait about 15 minutes or more after charging the battery or running
the bike to allow the "surface charge" to disappate. I put this table on a little card and keep it with the VOM.
Percent Voltage
of charge: Reading:
100% 12.63
90% 12.54
80% 12.45
70% 12.36
60% 12.27
50% 12.18
40% 12.09
30% 12.00
20% 11.91
0% 11.82 So from using this chart it suggests the battery is about 50% discharged at 12.25 volts. There could be multiple reasons for the vest not getting hot like wiring that is too small for the load, blown fuse or poor connections. But no matter what I wouldn't use a Harbor Freight multimeter unless that was the absolutely only option. I've used them before and couldn't get two to read the same on the same connection at the same time. Best,
Jeff Saline
The Beautiful Black Hills of South Dakota
75 R90/6, 03 KLR650
. . . . .
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