12V to 15V or 30V inverter
Submitted: Monday, Apr 30, 2007 at 16:36
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techie
Is there such an item one may purchase which will invert a 12 volt supply to 15 or 30 volt at 8 to 20Amps. If so where and how much.
Want to charge 24V secondary from 12v alternator
Thank you
donk
Reply By: SCUBADOO - Monday, Apr 30, 2007 at 17:08
Monday, Apr 30, 2007 at 17:08
I have no doubt such devices exists, but they WILL be expensive.
Many people with the more usual 12V setup (including me) use a 12VDC to 240VAC inverter connected to a smart charger. Operates perfectly.
All you need is a 12VDC to 240VAC inverter, but connected to a 24V battery smart charger instead.
Ratings are all dependant on your requirements.
Neville
AnswerID:
236882
Reply By: Alloy c/t - Monday, Apr 30, 2007 at 17:33
Monday, Apr 30, 2007 at 17:33
Superc--p sell a 12v to 24v inverter / converter , one of their many Chinese imports , how good ? cant say as have not used one , just know they sell em.
AnswerID:
236891
Reply By: FredW - Monday, Apr 30, 2007 at 17:44
Monday, Apr 30, 2007 at 17:44
You did not specifu how much current you need, but Dick Smith is selling such a unit giving 2 amperes for $ 30. Cat: K3234
AnswerID:
236894
Follow Up By: fisho64 - Monday, Apr 30, 2007 at 21:30
Monday, Apr 30, 2007 at 21:30
"Is there such an item one may purchase which will invert a 12 volt supply to 15 or 30 volt at 8 to 20Amps. If so where and how much."
8 to 20 amps
FollowupID:
498020
Reply By: Member - Olcoolone (SA) - Monday, Apr 30, 2007 at 17:46
Monday, Apr 30, 2007 at 17:46
What type of battery are you trying to charge, if you try and charge a 24v batterys from anything lower then 27v (you mentioned 15 or 30v) it will either not charge the battery or charge it not to full charge.
You can buy a 12v to 24v converters rated at 20amps (as in 12v in 24v out) for about $300 but it is not designed to charge batterys and being switch mode technology you will destroy it.
We use these converters in our service vehicles so we can
test 24v equipment out in the field from the service vehicles 12 battery.
If you use a 12v to 240v inverter and then plug a 24v battery charger into the 240v inverter that will work, but then you will have to charge the 12v battery all the time.
You will find that if you use a 24v charger on the 240v inverter running from a 12v battery, you may put 15amps into the 24v battery but take 40amps from the 12 volt battery.
Can you give some more details on what you are trying to achive.
regards Richard
AnswerID:
236895
Reply By: Robin - Monday, Apr 30, 2007 at 17:57
Monday, Apr 30, 2007 at 17:57
Hi Techie
Used a 12/24v converter here from gsl.
They actually put out a regulated 25v , a little low for charging - but I played with reference resistors and used 28v.
Short circuit proof also
www.gsl.com.au/products/vdoublers.shtml
Robin Miller
AnswerID:
236898
Follow Up By: disco1942 - Monday, Apr 30, 2007 at 23:42
Monday, Apr 30, 2007 at 23:42
The big problem is that if you supply enough voltage to bulk charge the battery then continued use of this charger whilst you are driving will over-charge your battery and stuff it. Much better to use the inverter driving a 3 stage battery charger as already proposed in several replies above. This will charge the battery very quickly and then cut itself back to float/maintenance charging automatically.
PeterD
FollowupID:
498057
Follow Up By: Robin - Tuesday, May 01, 2007 at 07:51
Tuesday, May 01, 2007 at 07:51
Hi Peter
I think we have disagreed on this before in that a fixed voltage charger is not ideal but can be shown to outperform some other methods particularly as it is current limited.
It is afterall , what a car alternator delivers , and is the basis of many sucessfull commerical installations .
Robin Miller
FollowupID:
498078
Reply By: Mainey (WA) - Monday, Apr 30, 2007 at 23:59
Monday, Apr 30, 2007 at 23:59
can you fit a second alternator (24v) because that's the safe, reliable and assured method.
AnswerID:
237028
Reply By: Member No 1- Tuesday, May 01, 2007 at 08:07
Tuesday, May 01, 2007 at 08:07
check with a Transformer (see yellow pages) manufacturer in your state
AnswerID:
237044
Reply By: Pajman Pete (SA) - Tuesday, May 01, 2007 at 08:14
Tuesday, May 01, 2007 at 08:14
Redarc in SA cut their teeth on this stuff. They may be worth a call:
08 8186 5633
No affiliation etc etc.
Cheers
Pete
AnswerID:
237047
Reply By: techie - Thursday, May 03, 2007 at 11:11
Thursday, May 03, 2007 at 11:11
Thank you to one and all for the answers you have provided.
I am still following up on researching which way to go.
I am looking at making my own inverter using parts from a microwave oven which uses an inverter to generate high voltages.
Will let you all know how it turns out.
Donk
AnswerID:
237630