Go Back   Cruiser Log World Cruising & Sailing Forums > Cruising Forums > The Bosun's Locker > Power & Electronics
Cruiser Wiki Click Here to Login

Join Cruiser Log Today

Thread Tools Search this Thread Display Modes
Old 06-01-2012, 08:51 PM   #1
Join Date: Jun 2012
Home Port: New Iberia
Posts: 7
Default 12 vdc 30 amp Power Supply question

I have a ICOM M710 SSB Transceiver and want to use a power supply with 120 vac input and 13.8 vdc output. The radio spec calls for 30 amps but not sure if this is continuious or not. I've seen power supplies that claim 25 amp continuious and 30 amp SURGE...but I think I need 30 amp continuious. Any thoughts?

JohnPNorth is offline   Reply With Quote
Old 06-01-2012, 11:32 PM   #2
redbopeep's Avatar
Join Date: Jun 2007
Home Port: Washington DC
Vessel Name: SV Mahdee
Posts: 3,236

So, it depends on how fast you talk--quick or intermittent....

OK...seriously, I wouldn't provide the minimum required. However, you'd probably assume that you're needing 30 amps on transmission. Therefore, provide at least 30 continuous. Just my opinion.

Good Luck.

"Do or do not. There is no try." - Yoda

What we're doing - The sailing life aboard and the Schooner Chandlery.

redbopeep is offline   Reply With Quote
Old 06-01-2012, 11:42 PM   #3
Join Date: Jul 2009
Home Port: St. Augustine FL
Vessel Name: Linnupesa
Posts: 189

Technically you'd need to be sending a continuous "key down" RF carrier to be in "continuous duty" mode. So for voice SSB you'll be fine, as modulation peaks are nowhere near continuous. But won't you be receiving primarily?

Some speech compression modes, FSK/FM etc. might use a bit more power but a nominal 30A should handle it. It does come down to specmanship which is kinda like politics. Believe only half of what you read, yeah, this too! Best to ask someone with a similar supply, as it could be both over or under-rated and they could tell you. Quite often the deal is X watts out for 5 min. (meeting the claim) but thereafter you can fry omelettes on the supply, at least until it dies.

Shouldn't you be wired directly into your batteries though? Run a big charger to replenish them. It's much cheaper than a DC-PSU and will give better regulation too. Do use the heaviest and shortest DC leads practical and pay special attention to make good low resistance connections. Soldering them helps.

Good luck.

Ivo aka KI6S and previously ZS1DD
linnupesa is offline   Reply With Quote
Old 06-02-2012, 02:54 AM   #4
Lexx's Avatar
Join Date: Feb 2008
Home Port: Port Douglas
Vessel Name: S/V Travesty
Posts: 214

Hard wired is the way to go. Forget the separate power supply. Soldered connections with an inline fuse or breaker switch in the line is the way to go. Cheaper, easier, and simpler all round.

"No matter where you go, there you are".
I've Contributed to the Cruisers Wiki: https://www.cruiserswiki.org/wiki/Port_Douglas
Lexx is offline   Reply With Quote
Old 06-02-2012, 10:07 AM   #5
Join Date: Jun 2012
Home Port: New Iberia
Posts: 7
Default 12 vdc 30 amp power supply

Hi Folks,
Thanks for your comments and suggestions. I decided to buy a 30 amp continuious supply. Also I do have the radio connected to the boat battery but plan to use this radio in my house while my boat is on the hard for repairs, etc.

I considered just using a battery but not to keen about having a battery in the house. I currently have it connected to a 13 vdc/4 amp supply for listening purposes and once I get the new power supply I will measure the current draw during transmit and just see what it really pulls.

Any suggestions on marine SSB frequencies to listen to in the Gulf of Mexico area?
Thanks again,

JohnPNorth is offline   Reply With Quote
Old 06-03-2012, 10:11 AM   #6
haiqu's Avatar
Join Date: May 2011
Home Port: Bundarra, NSW
Vessel Name: None
Posts: 1,556

Try this page John:

World MM Nets - a Cruising Guide on the World Cruising and Sailing Wiki


"The cure for anything is salt water... sweat, tears, or the sea" -- Isak Dinesen

I've Contributed to the Cruisers Wiki: All sections
haiqu is offline   Reply With Quote
Old 06-03-2012, 05:02 PM   #7
Join Date: Jun 2012
Home Port: New Iberia
Posts: 7

Thanks Rob alot

JohnPNorth is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
240V AC supply into a 120V boat? Gallivanters Power & Electronics 5 05-23-2012 10:32 AM
So, You Want Solar Power? Lighthouse Power & Electronics 0 11-07-2008 06:30 PM
Pedal Power Peter Owen The Poop Deck 3 01-04-2008 03:21 PM

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

RV & Travel Trailer Communities

Our RV & Travel Trailer sites encompasses virtually all types of Recreational Vehicles, from brand-specific to general RV communities.

» More about our RV Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

All times are GMT. The time now is 11:19 AM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.0