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Author Topic: Marine battery with dc converter?  (Read 2287 times)

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Offline georgeh

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Marine battery with dc converter?
« on: January 13, 2015, 01:36:43 PM »
Couldn't find this topic, although I thought I might have asked before?
Has anyone tried using a marine battery and dc convertor to charge equipment during a four day festival?
personally, i am looking to charge M148 and dvd battery, plus turn on laptop for transferring flash card.
Assuming I give the marine battery a slow charge before leaving town, do you think it would last?
the M148 needs as close to 12 hour charge as I can give it each night, dvd battery not as much.
Trying to figure if I really need to spend the money on RV camping with electric or get by with marine battery.
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Offline Hypnocracy

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Re: Marine battery with dc converter?
« Reply #1 on: January 13, 2015, 03:01:56 PM »
One downside is audible....the DC to AC converter my buddy uses is...well LOUD...not as loud as a air mattress pump...but similar in tone and the more load the louder it got. Not sure we would be welcome in the tent section with one running 12 hours with his.

We ended up sitting in my SUV and doing file dumps but gave upon DVD battery recharges.
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Offline DiggerinVA

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Re: Marine battery with dc converter?
« Reply #2 on: January 13, 2015, 04:31:58 PM »
George what is the output of the Walwart for the M148?
I have an idea.
Sony C38B's --> Lunatec V2-->PMD661
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Offline georgeh

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Re: Marine battery with dc converter?
« Reply #3 on: January 13, 2015, 05:37:39 PM »
Stan, still trying to track that info down.
as far as noise, the dc convertor I have is quite, low hum is all you get.
microtech gefell sms 2000, MG 21 & 20 & 27 caps >
M148 (with new ext battery) > acm P2 (2 of them)
Nbob active cables / PFA, Nbox Platinum

Offline DiggerinVA

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Re: Marine battery with dc converter?
« Reply #4 on: January 13, 2015, 06:58:21 PM »
It is usually printed on the wart.

hint I have 9 mp 3300's
Sony C38B's --> Lunatec V2-->PMD661
B-3's --> Tinybox 1.5 --> PCM-M10

Offline DiggerinVA

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Re: Marine battery with dc converter?
« Reply #5 on: January 13, 2015, 07:24:53 PM »
Sony C38B's --> Lunatec V2-->PMD661
B-3's --> Tinybox 1.5 --> PCM-M10

Offline georgeh

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Re: Marine battery with dc converter?
« Reply #6 on: January 14, 2015, 06:09:04 PM »
WOW 54 volts My idea is trash.
http://taperssection.com/index.php?topic=52730.0

so you saying, no way on the marine battery doing the job, 4 days......I'd say 11 hours of recording? Which by Doug's estimate of twice the time to charge...never have done that and still seem to come out good on life of M148
microtech gefell sms 2000, MG 21 & 20 & 27 caps >
M148 (with new ext battery) > acm P2 (2 of them)
Nbob active cables / PFA, Nbox Platinum

Offline DiggerinVA

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Re: Marine battery with dc converter?
« Reply #7 on: January 15, 2015, 05:43:15 PM »
Actually the Marine battery should do it fine. I was thinking DC to DC Transfer, it still could be done but more info would be needed. Remember you only need 3 days, day one the brick is fully charged at home. The laptops internal battery should be more than enough to take care of it's needs(just transfers). I don't think running the deck is a problem. I have 2 Naztech clones, a RC battery and 9 MP3300's. I have the V2 and my Marantz PMD661, I am going to run internal batteries in the Sony's.

What is needed is the consumption of that charger, so you can figure out what it pulls and what the battery has to dish out. Doug should know that off the top of his head.
Sony C38B's --> Lunatec V2-->PMD661
B-3's --> Tinybox 1.5 --> PCM-M10

Offline fsulloway

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Re: Marine battery with dc converter?
« Reply #8 on: January 15, 2015, 08:31:06 PM »
How many amp hrs is the deep cycle battery?  Inverters are usually not very efficient so a lot of juice will be wasted there.
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Offline Gutbucket

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Re: Marine battery with dc converter?
« Reply #9 on: January 15, 2015, 11:58:52 PM »
I take a 12VDC marine deep-cycle to fests and charge DVD batteries, AAs, AAAs, 9Vs and cell phones from it directly.  No inverter.  Made a 4-outlet car cig-lighter adapter fan out to plug in the various stuff. Works great and have never run out of juice.

DVD batteries and battery chargers I have all use 12VDC input from 115VAC wall-wart supplies so they run fine direct using a cig-lighter plug.  Phones charge with a regular car charger.  I made sure the chargers ran natively on 12VDC when I bought them.
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Offline Colin Liston

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Re: Marine battery with dc converter?
« Reply #10 on: January 16, 2015, 07:26:28 AM »
George what is the output of the Walwart for the M148?
I have an idea.

54 volts.  Sorry didn't realize you had already posted this. 
« Last Edit: January 16, 2015, 07:28:36 AM by Colin Liston »
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Offline Gutbucket

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Re: Marine battery with dc converter?
« Reply #11 on: January 16, 2015, 09:56:03 AM »
To avoid using an inverter and going 12VDC>115VAC>device's AC>DC adapter, you could use a DC>DC converter that steps up the 12VDC to 54VDC.  Not sure if you can find that available in a pre-built off the shelf package, or if you'd need to build it yourself or have someone build it for you.

A small off the shelf inverter will probably work fine though.  Not nearly as efficient, you need to remember/be around to turn it off, and they usually have a fan running, but the charging draw should easily be handled by a decent sized fully-charged marine deep-cycle.
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Better recording made easy - >>Improved PAS table<< | Made excellent- >>click here to download the Oddball Microphone Technique illustrated PDF booklet<<

Offline georgeh

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Re: Marine battery with dc converter?
« Reply #12 on: January 17, 2015, 08:46:40 PM »
thanks for the info. Need to take the time to figure out more info.
but have a much better idea of what I need now
microtech gefell sms 2000, MG 21 & 20 & 27 caps >
M148 (with new ext battery) > acm P2 (2 of them)
Nbob active cables / PFA, Nbox Platinum

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Re: Marine battery with dc converter?
« Reply #13 on: January 19, 2015, 03:31:57 PM »
For festies I have to bring along my CPAP machine because I have sleep apnea.  I thought about paying lotsa money for their direct DC to DC device, then I realized all I gotta to is buy another battery and use my inverter.  It was the cheaper option and both batteries last me all weekend with power to spare.

 

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