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Unread 05-02-2017, 09:25 PM   #1
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Default Battery Discharge

I have a new set of US Batteries in a 2013 CC Precedent and they are loosing about a half a volt a day when unused. Is that a pretty normal rate of loss?
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Unread 05-03-2017, 06:52 PM   #2
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Default Re: Battery Discharge

That's about right according to JohnnieB.
The self-discharge rate of batteries is about 1% of the SoC per day, so for 225AH batteries it is about 2.3AH per day, or a flow rate of about 0.1A. So a 36V solar charger that puts out 100 Milli-amps or more, ought to keep them charged.

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Putting the Run/Tow switch in Tow doesn't completely turn off a PDS controller and keeping the filter capacitors charged in any type controller draws current for the battery pack.

Disconnecting the any of the high current cable connecting the batteries in series will reduce the parasitic drain on the battery pack. The batteries, in and of themselves, will still self-discharge, but the overall discharge rate of the pack will be less. (Be aware that you'll get an arc when you reconnect the cable.)

Last edited by JohnnieB; 11-05-2015 at 11:35 AM.. Reason: Added comment
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Unread 05-03-2017, 09:24 PM   #3
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Default Re: Battery Discharge

Quote:
Originally Posted by Muddog View Post
That's about right according to JohnnieB.
The self-discharge rate of batteries is about 1% of the SoC per day, so for 225AH batteries it is about 2.3AH per day, or a flow rate of about 0.1A. So a 36V solar charger that puts out 100 Milli-amps or more, ought to keep them charged.

------------
Putting the Run/Tow switch in Tow doesn't completely turn off a PDS controller and keeping the filter capacitors charged in any type controller draws current for the battery pack.

Disconnecting the any of the high current cable connecting the batteries in series will reduce the parasitic drain on the battery pack. The batteries, in and of themselves, will still self-discharge, but the overall discharge rate of the pack will be less. (Be aware that you'll get an arc when you reconnect the cable.)

Last edited by JohnnieB; 11-05-2015 at 11:35 AM.. Reason: Added comment
Thanks for the reply Muddog. I'll flip the run/tow switch tomorrow and see if it affects the discharge. This cart may sit at a remote site for two to three weeks without a charge and I don't want to damage the new battery set. My full charges read 52V so a .5V a day discharge would get me to 48V in just 8 days, maybe sooner if the weather is cold.

If I remember correctly, a 48V string starts loosing it's life expectancy if it discharges under 48V.

Where would I find a solar charger for the 48V cart? That might extend my time a few days.
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Unread 05-04-2017, 06:00 AM   #4
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Default Re: Battery Discharge

Is there a receptacle close where you could plug in a battery float charger? That is what I use and have been very pleased. It's a SaveABattery brand that I've used for about 3 years. As far as a 48 volt solar panel, hooking (4) 12 volt car units in series might be the cheapest way. Either one will just be a maintainer. The batteries still need to be charged completely with the cart charger after every use.
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Unread 05-04-2017, 10:15 PM   #5
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Default Re: Battery Discharge

First let me say that I love the Vet avatar! Very nice classic. I've got an old and a newer import that I enjoy.
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Unread 05-04-2017, 10:36 PM   #6
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Default Re: Battery Discharge

A tender would be the trick if I had electricity, but the closest power is about a half a mile away. I do carry a generator and will use it to charge the buggy when I'm there. There will be times when I'm not around for weeks and that's what I'm trying to remedy. If I could find a 24VCD solar system with a controller I could break the string in two and use two systems to maintain the batteries.
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Unread 05-05-2017, 03:17 AM   #7
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Default Re: Battery Discharge

Thanks, I like Porsches too. There aren't many 914s left around here. Most were thrown away or rusted away long ago. Nobody saw the potential until it was too late.

If I were you I would look into hooking 4 12 volt units in series, and mount them on a panel, wire them permanently through a on/off toggle switch. You can buy them all for less than $100. I have one on my tractor shed and they work great.

https://www.harborfreight.com/15-wat...ger-68692.html
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Unread 05-05-2017, 11:00 PM   #8
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Default Re: Battery Discharge

Couldn't agree more on the 914 comment. This car is a 3.0L six with a LSD, gears, Brembos and a bunch of custom touches. Super fun car to mess with the unsuspecting.

I took your advice and spoke to a solar company today and explained my need. They agreed that a low watt series of 12vdc panels would produce about 110ma in peak times and certainly would curb the discharge. The overall output is low enough that a controller isn't needed.

I found twin pack 1.5W panels at NT and got two today for $65. I'll work on the design to mount them as a group and give them a test.

Thanks for the suggestion.
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Unread 05-10-2017, 09:33 PM   #9
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Default Re: Battery Discharge

A half a volt a day is horrible. Way too much. Not normal.
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Unread 05-10-2017, 11:53 PM   #10
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Default Re: Battery Discharge

The Run/Tow switch change made a notable difference. I'm assembling the 48v solar maintainer which should extend the idle battery life out to 3-4 weeks if it works like I hope.
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