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 > Picking up batteries. What do I look for before accepting?

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HiTech

Texas

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Posted: 01/25/13 10:35pm Link  |  Print  |  Notify Moderator

HiTech wrote:

I got to the point in charging that the 2 amp setting for a few hours (with a very small draw) the voltage fell down to 13.55v, but the 8 amp setting creeps up to 14.65v at 3 amps (my max charge spec is 14.6v). The 2 amp setting on the smart charger is running at 14.08v -14.21v (runing up and back a few time a minutes, toing the smart charger sulfation reduction dance), so I will let it go for a few hours then take a resting voltage.

Jim


Resting voltage after an hour or two is 13.03v, more in line with what I was hoping to see before testing. Quick 100A draws (maybe a second) right after I stopped charging saw voltage spring back up over 13v as well. So I charged back up a touch and called it good. I will let the AGMs rest over night and see where they settle out to in the morning. I never knew there was so much involved in really getting new batteries all the way charged up!

Jim

mena661

Southern California

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Posted: 01/25/13 10:44pm Link  |  Print  |  Notify Moderator

HiTech wrote:


Resting voltage after an hour or two is 13.03v, more in line with what I was hoping to see before testing. Quick 100A draws (maybe a second) right after I stopped charging saw voltage spring back up over 13v as well. So I charged back up a touch and called it good. I will let the AGMs rest over night and see where they settle out to in the morning. I never knew there was so much involved in really getting new batteries all the way charged up!

Jim
Took me a while too. Only one was fully charged, the rest were like 95%. Did a number of equalizes.


2009 Newmar Canyon Star 3205, Ford F53 V10
Trojan L16 6V's 740 Amp-hours


HiTech

Texas

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Posted: 01/26/13 06:18am Link  |  Print  |  Notify Moderator

Resting voltage this morning is 12.92v.

I I have 2 250 w infrared heating bulbs. I am thinking about later using them with a dimmer switch as a load since I could adjust the watts drawn pretty easily with that to try for constant current discharge curves. I do have the theoretical discharge curves for their whole line of AGM batteries to compare to.

For now it is probably just the inverter and various sized light bulbs in a single shop light.

Jim

pianotuna

Regina, SK, Canada

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Posted: 01/26/13 06:34am Link  |  Print  |  Notify Moderator

Hi Jim,

I find that constant watts output from my inverter means that as voltage drops on the battery bank, amps rise because the inverter automatically tries to keep out put voltage constant. Eventually, under large loads the output voltage does begin to sag.


Regards, Don
Full Time in a Kustom Koach Class C 28'5", 256 watts Unisolar, 875 amp hours in two battery banks 12 volt batteries, 2500 MSW watt inverter.

BFL13

Victoria, BC

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Posted: 01/26/13 07:21am Link  |  Print  |  Notify Moderator

Doesn't work using 12v lamps either. The voltage goes down and the bulbs dim, making amps drop (instead of getting inverter creep upwards with 120v lamps) With the 12v lamps you have to keep turning on more lamps to maintain a constant amps load as voltage goes down.


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