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Author Topic: Heavy Duty Jump Starters: Ham Radio / Emerg. app'ns  (Read 3350 times)
VK5CQ
Member

Posts: 142




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« on: May 02, 2016, 07:19:56 PM »

With SoTA & Field Day all the rage,
I wonder how effective some of the
better Jump Starters might be.

Oh, having just got a 24v DC mil.spec
Clansman 320, I'm also looking for a
bit of advice on using 2 Jump Starters
as a 24v DC supply for testing and/or
portable use.

A local auto supply discounter had a
sale on a "900 Amp" Jump Starter, &
we bought several.

Feature Summary:

+ Audible+Visual "ChargeMe" indicators
+ 2-Stage SmartCharging system
+ High Current JumperLeads w/ AligatorClips
+ SolarPanel charging source socket (on rear)
+ Twin 12v LighterPlug outlets
+ Bright LED work light
+ Spark+Surge protection
+ ReversePolarity alarm

From memory, it's Sealed Lead Acid
battery has a 14 Amp rating.

A YouTube blogger's test of such
'Starters lead me to think that to
use it to start a car's engine would
slightly damage its battery (a bit)
each time it tries to do so.

I propose Not to do that, but
to plug 1 or 2 radios into as many
LighterPlugs & maybe use its LED
light if needed, eg, Yaesu:

+ FT-817ND, FT-60R (use same cable)
+ FT-8900R, TF-9800 ( "      "         " )

First, are there any reasons NOT to?

I think a 12v PV Solar Panel can be
supply charging power via the rear
power socket, hopefully, WHILE the
unit is Powering a Radio or 2.

Now, my Known Unknown is:

Is it wise to try to develop 24v DC
by connecting 2 identical Chargers'
sets of Alligator Clips in Series, to
power a 24v Radio like a Clansman?

I'd appreciate your comments &
suggestions. :-)

(Also, I'm thinking of attaching a
base for a smaller, lightweight
antenna to this heavy unit's top
handle or side, for use while
setting-up for the portable
station.)
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KC2MMI
Member

Posts: 717




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« Reply #1 on: May 02, 2016, 08:04:25 PM »

"From memory, it's Sealed Lead Acid
battery has a 14 Amp rating."
 That's the only number that counts if you are using it as a power supply for a radio.
Also bear in mind, those small SLA batteries usually degrade by 25% per year, i.e. you throw them out at the end of four years. And, they degrade about 25% for a 10 degree centigrade rise from room temperature, so on a hot summer day you'll lose capacity even faster.
 More bad news, they are only designed for about a 30% discharge, i.e. 4-5 amp hours. Taking them down further than that greatly reduces the number of charge cycles.
 So while it may be able to put out 900 amps for the ten seconds a car needs to turn over the starter, it is not worth much for powering a transmitter. Go on Amazon, order a couple of 20A batteries (which sometimes can be found for $20 each postpaid) or something similar. Go to WalMart or Sams Club and buy a cheap marine deep cycle battery.
 But the jump boxes are an overpriced waste of time for backup power supplies.

The good news is that of course you can connect two 12v batteries in series to make a 24v supply, but unless you've been using them consistently, one will lose power way before the other one, so you're better off getting a 24v supply and using it just for that radio.
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VK5CQ
Member

Posts: 142




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« Reply #2 on: May 06, 2016, 10:03:19 AM »

AFAIK, we don't have any WalMart (or similar) here in VK (ie, AU).

Since starting this thread, I have ordered some 0-24v DC lab / workbench power supplies.

I guess my "Heavy Duty" Jump Starters are best reserved for Receivers, eg, during longer listening periods.

When it's time to transmit, we could switch to a more substantial power source.

One more possibility, since my Jump Starter has a Solar PV panel input, IF the 12v Solar Power (output by the PV panel's voltage regulator box) feeds-through to the Lighter-Plugs, etc., ie, while also charging the Jump Starter, our "200 watt" PV panel might support at least a QRP operation, eg, for activating summits (SoTA) or as part of a Field Day station... ie, when Sun is Shining Brightly... :-)
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VK5CQ
Member

Posts: 142




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« Reply #3 on: May 06, 2016, 10:09:33 AM »

Oh, there was another Thread on eHam.net's front page,
on such Jump Starters & SLA batteries.

I'd earlier seen a YouTube video (by a long-time blogger, with roots in S Africa), who tested & compared various (mostly small) Jump Starters... some of which caught fire, during the test!

After seeing his results, I decided to protect my Jump Stsrters from "Jump-Starting duty" & see how we go.
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W4KYR
Member

Posts: 1114




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« Reply #4 on: May 11, 2016, 06:43:21 AM »

If you are going to lug around two 12 volt deep cycle batteries. It might be better getting a very small AC 2 cycle generator and mount it to a hand truck. It would probably about the same weight as two deep batteries, maybe even less. Use with a 240 volt to 24 volt power supply for VK land. You don't have to worry about recharging the batteries or battery packs wearing out after a few years.

Here in the U.S. they sell this two cycle 120 volt generator at a place called Harbor Freight. It is often on sale for $89 . Maybe they have similar generators (using 240 v) for sale in VK land.

http://www.harborfreight.com/900-peak700-running-watts-2-hp-63cc-2-cycle-gas-generator-epacarb-60338.html


« Last Edit: May 11, 2016, 06:46:51 AM by W4KYR » Logged

Still using Windows 98  ------------------ for Packet Radio.
ONAIR
Member

Posts: 2668




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« Reply #5 on: May 11, 2016, 10:25:56 AM »

If you are going to lug around two 12 volt deep cycle batteries. It might be better getting a very small AC 2 cycle generator and mount it to a hand truck. It would probably about the same weight as two deep batteries, maybe even less. Use with a 240 volt to 24 volt power supply for VK land. You don't have to worry about recharging the batteries or battery packs wearing out after a few years.

Here in the U.S. they sell this two cycle 120 volt generator at a place called Harbor Freight. It is often on sale for $89 . Maybe they have similar generators (using 240 v) for sale in VK land.

http://www.harborfreight.com/900-peak700-running-watts-2-hp-63cc-2-cycle-gas-generator-epacarb-60338.html



   Thanks for the tip!  Looks like it could be a great solution for portable operations!!  Smiley
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ZL1BBW
Member

Posts: 950




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« Reply #6 on: May 11, 2016, 02:12:56 PM »

Bunnings have them in stock, normally.
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ex MN Radio Officer, Portishead Radio GKA, BT Radio Amateur Morse Tester.  Licensed as G3YCP ZL1DAB, now taken over my father (sk) call as ZL1BBW.
VK5CQ
Member

Posts: 142




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« Reply #7 on: May 11, 2016, 03:38:15 PM »

Generators bring some concerns:

1. Noise (if too close to station)
2. Exhaust (if too near door to closed-in station space)
3. Has the 240v ac produced a good Sine wave for electronics?
4. Fire hazard (during Bushfire season)
5. Petrol carrying+storage risks
6. Limits on ability to carry Petrol Generator (normal car or wagon), after 1st use
7. Desire to leave Fossil Fuel devices in the past - symbollic gesture
8. Sometimes a theft risk, eg, after station closes for sleep
9. Burn + Carvon Monoxide risk for very young kids (toddlers) [& very old Hams? :-) ]

Other than the above, no problem... ;-)
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VK5CQ
Member

Posts: 142




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« Reply #8 on: May 11, 2016, 03:49:02 PM »

We also have a couple of "200 watt" PV Solar Panels.

Very large, very heavy, but I wonder how safe & easy
it might (or might not?) be to connect them in Series
to produce 24v for Clamsman 320?

(We have a 12v Voltage Regulator for each one,
but - since acquiring our first 24v Klansman 320 -
we've seen ad's (eBay, AliExpress, etc.) for some
"12 v / 24 v" VR boxes.

This would enable us to leave 1 PV Panel at home,
or run 2 stations requiring 24v (for Field Day tests,
or QRP powered by Solar experiments), at distance.

I know this is becoming (like) a Rube Goldberg
machine, in (undue) complexity, but - with all
the bits of technology involved - it may also
serve as Leaning Opportunities for students, et al.

How to best connect 2x 12v PV Solar systems (ea.
with its own VR box) to produce the needed 24v?
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W4KYR
Member

Posts: 1114




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« Reply #9 on: May 11, 2016, 04:23:10 PM »


How to best connect 2x 12v PV Solar systems (ea.
with its own VR box) to produce the needed 24v?

Connect your solar 2 x 12v solar panels in series into a 24 volt charge controller and then to the batteries.

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Still using Windows 98  ------------------ for Packet Radio.
KJ4RWH
Member

Posts: 184


WWW

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« Reply #10 on: May 17, 2016, 05:46:50 PM »

Generators bring some concerns:

1. Noise (if too close to station)
2. Exhaust (if too near door to closed-in station space)
3. Has the 240v ac produced a good Sine wave for electronics?
4. Fire hazard (during Bushfire season)
5. Petrol carrying+storage risks
6. Limits on ability to carry Petrol Generator (normal car or wagon), after 1st use
7. Desire to leave Fossil Fuel devices in the past - symbollic gesture
8. Sometimes a theft risk, eg, after station closes for sleep
9. Burn + Carvon Monoxide risk for very young kids (toddlers) [& very old Hams? :-) ]

Other than the above, no problem... ;-)

Don't worry, he promises to wear a helmet during use!
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