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Battery Charger use on Generator Power


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  #21  
Old 01-14-2014, 10:50:17 AM
Ted_Cool Ted_Cool is offline
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Default Re: Battery Charger use on Generator Power

I'd be willing to bet that if you put two of those 12 volt chargers in series, it would work fine for a 24 volt system.
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  #22  
Old 01-14-2014, 11:04:34 AM
reybo reybo is offline
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Default Re: Battery Charger use on Generator Power

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Originally Posted by ted_cool View Post
I'd be willing to bet that if you put two of those 12 volt chargers in series, it would work fine for a 24 volt system.
Might that screw up the pulsing desulfators, causing them to send confusing signal?
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  #23  
Old 01-14-2014, 11:12:45 AM
grif grif is offline
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Default Re: Battery Charger use on Generator Power

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Originally Posted by ted_cool View Post
I'd be willing to bet that if you put two of those 12 volt chargers in series, it would work fine for a 24 volt system.
I'm at about 60% not thinking they're going to work right. On the other hand, I'll go 70% believing that two 12 volt batteries in series,,, with a separate charger on each battery would work fine. (I'm thinking of the BatteryTender Brand).

Schmacher(sp?) or one of those actually builds a 24v smart float maintainer for such things as scissor lifts and other small industrial machines.
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  #24  
Old 01-14-2014, 11:13:55 PM
Jim Marcozzi Jim Marcozzi is offline
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Default Re: Battery Charger use on Generator Power

The Iota chargers are a good unit, provided you have clean power. Most of their models use switch mode technology to produce the DC.

We've used www.kussmaul.com chargers for over 15 years in hundreds of emergency vehicle jobs and these things can take surges, spikes and other general dirty AC input. They also are very immune to heat.
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  #25  
Old 01-14-2014, 11:38:05 PM
reybo reybo is offline
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Default Re: Battery Charger use on Generator Power

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Originally Posted by Jim Marcozzi View Post
The Iota chargers are a good unit, provided you have clean power...
This concerns solar powered chargers.
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  #26  
Old 01-15-2014, 12:01:06 AM
len k len k is online now
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Default Re: Battery Charger use on Generator Power

24.4 VDC is not going to charge 24 V bat (unless the charger had a voltage step-up power supply).

A 12V bat is ~12.78V when fully charged (after sitting for ~24hrs with no charge or discharge). Need a few 1/10ths more voltage to overcome chemical back potential when charging so usually charge 12V bat with ~13.4-13.6V.

So would want double that or ~26.8-27.2VDC to charge a 24V bat (12.78*2 = 25.56V at 100% charged)

%Charge vs bat open circuit voltage......(voltage is after sitting for ~24hrs with no charge or discharge).
100%.... 12.78
80% ..... 12.54
60% ..... 12.30
40% ..... 12.06
20% ..... 11.82
0% ....... 11.58
For lead-acid batteries.

A bat will have a open circuit voltage higher than in above table after it comes off charging, takes something like ~24hrs to settle down to voltages in above table.

Last edited by len k; 01-15-2014 at 12:19:45 PM. Reason: clarify
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  #27  
Old 01-15-2014, 02:54:14 AM
Isaac-1 Isaac-1 is offline
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Default Re: Battery Charger use on Generator Power

Since the MEP-003a uses a pair of 12V batteries in series, the simple solution might be to just use 2 12V solar chargers, one wired to each battery.

Ike
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  #28  
Old 01-15-2014, 07:23:51 AM
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Elden DuRand Elden DuRand is offline
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Default Re: Battery Charger use on Generator Power

As long as the chargers have their outputs isolated from ground, there should not be any problem connecting a charger to each battery even if the batteries are connected in series.

With this hookup, the chargers treat the battery they're connected to as the only one and will behave properly.

I don't know what will happen with the charger on a dead battery if it reverses polarity when the string is loaded.

To insure against that happening, you could put a diode in series with the charger output to block reverse current but that would lower the charging Voltage by as much as .6 Volts
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  #29  
Old 01-15-2014, 08:48:22 AM
BlkBeard BlkBeard is offline
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Default Re: Battery Charger use on Generator Power

How about a Duel Battery Isolator ?

You can let the Generator do the charging, and not worry about draining your cranking battery.

And you don't use any AC output wattage

Last edited by BlkBeard; 01-15-2014 at 08:50:40 AM. Reason: added content
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  #30  
Old 01-15-2014, 09:30:02 AM
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Default Re: Battery Charger use on Generator Power

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Originally Posted by BlkBeard View Post
How about a Duel Battery Isolator ?

You can let the Generator do the charging, and not worry about draining your cranking battery.

And you don't use any AC output wattage
What is that blkbeard and how does it hook to the generator ?
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  #31  
Old 01-15-2014, 09:46:58 AM
BlkBeard BlkBeard is offline
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Default Re: Battery Charger use on Generator Power

It uses the vehicle, or in this case the generator charging system to charge the Cranking Battery & the Accessory Battery while the engine is running.

When the Engine is shut off it disconnects the common connection between the two batteries so you aren't drawing off of your Cranking Battery.

It's used on Boats, RV's, Travel Trailers etc.

Think it might be a good fit for this application.

If you Google "Duel Battery Isolator" the first page has images, and the first one is a line drawing of a typical system

Last edited by BlkBeard; 01-15-2014 at 10:00:33 AM. Reason: add content
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  #32  
Old 01-15-2014, 10:23:26 AM
armandh armandh is offline
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Default Re: Battery Charger use on Generator Power

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Originally Posted by reybo View Post
Ike, there seems to be a lack of good solar chargers for 24v mil gens like mine. The "Solargizer" was discontinued by its maker, and near as I can tell, the hundreds of them on ebay are the failures that were returned. I tried two. The panels measured the proper 24.4 voltage but neither one charged the batteries, and the LED light showing an energized circuit never lit, indicating infant mortality, as they put it.

So what does the military use to keep 24v batteries charged in their stand-by equipment when they're in distant stations?

BTW, a 12v solar panel and controller I use to keep the battery charged on a collector car is rock-solid reliable, but the company limits its products to 12v. Maybe I should just buy a pair of those and a knife switch to de-couple the gen's two 12v batteries.
or get two of the panels, one for each battery
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  #33  
Old 01-15-2014, 10:53:28 AM
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Default Re: Battery Charger use on Generator Power

That Duel Battery Isolator is pretty neat i'll read up on it some more blkbeard thanks .
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