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Multiple Quantars on a single Battery String?

This forum is for discussions regarding System Infrastructure and Related Equipment. This includes but is not limited to repeaters, base stations, consoles, voters, Voice over IP, system design and implementation, and other related topics.

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JJAllen
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Multiple Quantars on a single Battery String?

Postby JJAllen » Mon Aug 11, 2014 11:38 am

I have a location that needs two Quantar repeaters paralleled onto a single 24 volt string of batteries. Both Radios have the DC revert option, I simply don't have room for the additional batteries. The site is on a UPS and the DC revert is second level contingency- but required.
I have looked at length on this board and the internet but haven't seen anybody paralleling two radios onto a single set of batteries. I am worried that the Chargers on the two radios will "fight" and possibly let the magic smoke out. They may just share the charging duties, but I don't have a spare power supply in case they burn one another up.
Has anyone tried this before?
Is there a way to disable charging on one unit?


Thanks

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FMROB
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Joined: Sun Jan 12, 2003 2:28 pm

Re: Multiple Quantars on a single Battery String?

Postby FMROB » Tue Aug 12, 2014 8:21 pm

Yes, you can disable charging function on the Quantar. I would recommend a separate charger for batteries. I have found the life of the PS to fair better. Just my 2 cents.

Rob

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Bill_G
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Re: Multiple Quantars on a single Battery String?

Postby Bill_G » Wed Aug 13, 2014 4:23 am

That's not a bad idea. Rather than trying to figure out, and McGuiver some way for the two stations to safely charge the same string of batteries, turn the problem around, and put in a third device that charges and manages the batteries while keeping the radios independent. That is off the shelf and easy to find.

fineshot1
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Joined: Wed Oct 12, 2005 5:13 am

Re: Multiple Quantars on a single Battery String?

Postby fineshot1 » Wed Aug 13, 2014 5:03 am

I would look into getting one of these with the IQ smart charging option
and put all in parallel - no smoke about it. The batteries stay floated to
the top until the ac power goes out and no switching of load needed. The
Quantars will always be running on the batteries and no switching needed.
If the power goes out and the quantars run on battery for awhile the smart
charger will sense the battery charging needs when the ac power returns and
the batteries will be bulk charged if necessary or floated back up to top according
to what the smart charger thinks the batteries need.

I have used the 12V models for many years and they are bullet proof and survived
many power outages along with many more power hits and never had one quit on me.

http://www.iotaengineering.com/24vdc.htm
fineshot1
NJ USA

VE3TUH
Posts: 269
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What radios do you own?: more than I should...

Re: Multiple Quantars on a single Battery String?

Postby VE3TUH » Sun Aug 17, 2014 1:52 pm

I am running 2 low power MTR2000's paralleled at the battery revert port, using an Argus charger for battery maintenance. Seems to work ok.

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FMROB
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Joined: Sun Jan 12, 2003 2:28 pm

Re: Multiple Quantars on a single Battery String?

Postby FMROB » Mon Aug 18, 2014 10:01 am

fineshot1 wrote:I would look into getting one of these with the IQ smart charging option
and put all in parallel - no smoke about it. The batteries stay floated to
the top until the ac power goes out and no switching of load needed. The
Quantars will always be running on the batteries and no switching needed.
If the power goes out and the quantars run on battery for awhile the smart
charger will sense the battery charging needs when the ac power returns and
the batteries will be bulk charged if necessary or floated back up to top according
to what the smart charger thinks the batteries need.

I have used the 12V models for many years and they are bullet proof and survived
many power outages along with many more power hits and never had one quit on me.

http://www.iotaengineering.com/24vdc.htm


That may not work so well if the Quantar were not ordered DC only. If you shut off the charger in the Quantar the battery revert feature still functions. Maybe just shutting off charging with primary ac and a separate charger will do the trick. Plus the asc loss and battery power alarms will still function properly.

Rob

fineshot1
Posts: 1039
Joined: Wed Oct 12, 2005 5:13 am

Re: Multiple Quantars on a single Battery String?

Postby fineshot1 » Mon Aug 18, 2014 12:16 pm

FMROB wrote:
fineshot1 wrote:I would look into getting one of these with the IQ smart charging option
and put all in parallel - no smoke about it. The batteries stay floated to
the top until the ac power goes out and no switching of load needed. The
Quantars will always be running on the batteries and no switching needed.
If the power goes out and the quantars run on battery for awhile the smart
charger will sense the battery charging needs when the ac power returns and
the batteries will be bulk charged if necessary or floated back up to top according
to what the smart charger thinks the batteries need.

I have used the 12V models for many years and they are bullet proof and survived
many power outages along with many more power hits and never had one quit on me.

http://www.iotaengineering.com/24vdc.htm


That may not work so well if the Quantar were not ordered DC only. If you shut off the charger in the Quantar the battery revert feature still functions. Maybe just shutting off charging with primary ac and a separate charger will do the trick. Plus the asc loss and battery power alarms will still function properly.

Rob


Yes - your right. That is correct. My bad :)
fineshot1
NJ USA

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FMROB
Posts: 1001
Joined: Sun Jan 12, 2003 2:28 pm

Re: Multiple Quantars on a single Battery String?

Postby FMROB » Mon Aug 18, 2014 4:07 pm

No worries

Giovanni
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Joined: Mon Sep 08, 2014 6:38 am

Re: Multiple Quantars on a single Battery String?

Postby Giovanni » Mon Sep 08, 2014 6:50 am

Running 3 Quantar's on a single 24 V NiCad Bank without any problems now 4 years.
New style Motorola supplies.

JJAllen
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Posts: 2
Joined: Thu Jul 31, 2014 10:33 am

Re: Multiple Quantars on a single Battery String?

Postby JJAllen » Thu Oct 02, 2014 9:43 am

postby Giovanni » Mon Sep 08, 2014 7:50 am

Running 3 Quantar's on a single 24 V NiCad Bank without any problems now 4 years.
New style Motorola supplies


===>
Are you using AC supplies or DC only?

If you are using AC style supplies, Did you shut off the chargers in one or more of the Quantars?
If so, How do you shut off the battery charging in the Quantar?

I have AC supplies and I don't have room for a separate DC rectifier/charger, so at least one of the radios will need to float the batteries.

I also have a site with several DC only Quantars operating on one set of batteries fed by a 24 VDC rectifier/smart charger and it works well. But as I have mentioned I don't have room for radios and a charger too so I need a solution that allows both radios to connect to one set of batteries.
I need to know How to disable the charger in the Quantar.

Thanks


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