Reply
 
Thread Tools Search this Thread
 
Old 21 September 2011, 16:40   #1
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,855
Charger/adaptor question

I've just bought a Colman Hi performance rechargable Air Blower. It arrived today, but after I unpacked it I noticed the charger was an American adaptor 120v input

Anyway, the seller has offered compensation to the tune of a new adaptor, the only ones I can find are universal types for a 5er.

Specs for the charger is output : 7.5v dc 200ma

The universal Specs are: 7.5V dc but 300ma

Now the question is, will a 300ma output damage the electrics/lead acid battery at all?

The reson I ask is the wording in the ad on ebay Link look at the Warning part.

It reads: This unit maximum rating is 300mA and if less current is drawn, there is a corresponding voltage rise. At less than 150mA this rise could be considerable

Anyone in the know help?
__________________

__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 21 September 2011, 16:57   #2
Member
 
Country: UK - England
Town: london
Boat name: jelly bean
Make: quicksilver 3.4
Length: 3m +
Engine: suzuki df 9.9
Join Date: Sep 2011
Posts: 164
Quote:
Originally Posted by Hightower View Post
I've just bought a Colman Hi performance rechargable Air Blower. It arrived today, but after I unpacked it I noticed the charger was an American adaptor 120v input

Anyway, the seller has offered compensation to the tune of a new adaptor, the only ones I can find are universal types for a 5er.

Specs for the charger is output : 7.5v dc 200ma

The universal Specs are: 7.5V dc but 300ma

Now the question is, will a 300ma output damage the electrics/lead acid battery at all?



The reson I ask is the wording in the ad on ebay Link look at the Warning part.

It reads: This unit maximum rating is 300mA and if less current is drawn, there is a corresponding voltage rise. At less than 150mA this rise could be considerable

Anyone in the know help?
goto maplin electronics get a uk adaptor ............
__________________

__________________
www.tlmarine.co.uk
guernseylee is offline   Reply With Quote
Old 21 September 2011, 17:21   #3
Member
 
Country: Other
Town: Rosas
Boat name: Conqueror
Make: Valiant
Length: 7m +
Engine: Outboard 150hp Merc
Join Date: Dec 2010
Posts: 541
Send a message via Skype™ to Courageous
Andy don't fart about with chargers. You may already know that chargers for lead acid are completely different to those for Ni-cad units etc, some constant voltage and others constant current. I would personally leave this field well alone. For my money I would be looking at a step down transformer for the mains. Something similar to this:

Voltage Converter 220V To 110V Travel Power Transformer Regulator Adapter 100W | eBay
__________________
Courageous is offline   Reply With Quote
Old 21 September 2011, 19:28   #4
Member
 
Country: USA
Town: Seattle
Boat name: Water Dog
Make: Polaris
Length: 4m +
Engine: Yamaha 60hp
Join Date: Apr 2007
Posts: 1,152
Its will be fine, just charge a little faster than it should. Not knowing the battery capacity its hard to tell if this will be a problem but I doubt it. Normally charging at 20% of Ah capacity is ok. So as long as the lead acid battery is 300x5 = 1500mAh or GREATER (=1.5Ah which is tiny) you won't be overcharging and getting too hot. This must be a nominal 6V battery.

The warning seems to refer to the voltage rise which is required by a lead acid taper charger to achieve full charge. With a taper charger, it takes more and more voltage to "push" the last bits of charge into a battery nearly full. I could be mistaken the wording/warning is very strange.
__________________
captnjack is offline   Reply With Quote
Old 21 September 2011, 20:02   #5
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,855
I got confused by the warning too!

But my understanding is that the battery will take exactly what it needs. The ac/dc adaptor's maximum charging current is 300ma and obviously if the battery needs more amps it will take it at the maximum of the Charger which is 300ma so will charge very slightly faster.

So by that reckoning I think the charger should be fine for charging a 6v battery. Correct me please if I'm wrong.
__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 22 September 2011, 01:54   #6
Member
 
Country: Other
Town: Rosas
Boat name: Conqueror
Make: Valiant
Length: 7m +
Engine: Outboard 150hp Merc
Join Date: Dec 2010
Posts: 541
Send a message via Skype™ to Courageous
"Correct me please if I am wrong"
__________________
Courageous is offline   Reply With Quote
Old 22 September 2011, 02:02   #7
Member
 
Country: Other
Town: Rosas
Boat name: Conqueror
Make: Valiant
Length: 7m +
Engine: Outboard 150hp Merc
Join Date: Dec 2010
Posts: 541
Send a message via Skype™ to Courageous
Andy, just to clarify for me please. The unit you have is a charger, the outlet of which plugs into the blower which simply houses the motor,fan and battery is this correct? If so then the "unit" we are talking about is a battery CHARGER not an adaptor. An adaptor such as you are looking at on ebay is a power supply unit only it does NOT operate as a charger for batteries. These are two completely different items in my opinion. Being a power supply unit will get it to "charge" a battery in a rather ineffective way but it will eventually feck it and worse it is possible it could overcharge, overheat and potentially catch fire IMHO.

But it's your risk of course. Strikes me you already made your mind up
__________________
Courageous is offline   Reply With Quote
Old 22 September 2011, 03:41   #8
Member
 
Leapy's Avatar
 
Country: UK - England
Town: Sheepy Parva
Boat name: Sadly Sold
Length: no boat
Join Date: Sep 2008
Posts: 1,728
Quote:
Originally Posted by Hightower View Post
Correct me please if I'm wrong.
Voltage adaptor...no risk...but bear in mind you need 240v to 110v not 110v to 240v

Alternative 240v charger per your eBay link...risk unknown...could be none, more likely could be some...personally, I wouldn't go there. Nothing more dodgy than badly worded low cost eBay electronics

__________________
Leapy is offline   Reply With Quote
Old 22 September 2011, 05:21   #9
Member
 
Country: Other
Town: Rosas
Boat name: Conqueror
Make: Valiant
Length: 7m +
Engine: Outboard 150hp Merc
Join Date: Dec 2010
Posts: 541
Send a message via Skype™ to Courageous
Thank you Leapy, except it's NOT a charger!

My concern is at the point when the current draw is minimal (ie battery fully charged) exactly what voltage will the adaptor allow it to rise to? This is the reason for the warning as stated. There is a point at which even with little current the battery will fry. If life was so simple why would we all be paying more for battery chargers instead of a simple transformer and a rectifier?

Is the extra fiver the problem Andy? Is it the fact that it's in HK? Maybe maplins do a similar transformer at a reasonable price. It is the right device for the job. Anyhow, as we say - your risk. Good luck with it anyhow.
__________________
Courageous is offline   Reply With Quote
Old 22 September 2011, 05:36   #10
Member
 
Country: Other
Town: Stanley, Falkland Is
Boat name: Seawolf
Make: Osprey Vipermax 5.8
Length: 5m +
Engine: Etec 150
Join Date: Mar 2006
Posts: 3,688
'Borrow' a site transformer designed for 110V power tools

FWIW I agree 100% with not using a power supply as a charger - cheap rubbishy power supplies usually have very poor voltage regulation and as the load comes off, the voltage goes up... maybe till it lets the smoke out. Good regulated power supplies usually cost 10x what a cheap one does for a reason! From the warning text you posted it sounds like the 5 model falls into the first category.

Your choice but it might be cheaper getting a converter than buying a new house
__________________

__________________
A Boat is a hole in the water, surrounded by fibreglass, into which you throw money...

Sent from my Computer, using a keyboard and mouse
BogMonster is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 21:39.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.