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Forum Index : Windmills : battery charging
| Author | Message | ||||
john Newbie  Joined: 24/03/2008 Location: AustraliaPosts: 6 |
could anyone tell me how to charge 12v battery bank from a 24v battery bank the easest way and best. |
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GWatPE Senior Member  Joined: 01/09/2006 Location: AustraliaPosts: 2127 |
Hi John, What equipment do you have? Do you have a budget? What size battery and type? Do you want to make, or buy? Answers to these questions and more will help. cheers, Gordon. become more energy aware |
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| john Newbie Joined: 24/03/2008 Location: AustraliaPosts: 6 |
Hi Gorden I made a f-p generator dual installed in to four batterys two 6v 900 ah and two 200 ah 12v battery I added two solar panells to the set up delivering about 9amps to setup all through a 40amp reg I then built a single f/p mill at a lower level about 5m high which workes verry well putting out 10amps I was not happy with dual mill so I installed a 24v 1000w[ baught one] through a reg split my batterys to two systems,my inverter is a 12v 8000w,I have the 24v mill to the two 200amp wet batterys which are fully charged all the time I have taken a tapping of one but not happy I hope you under stand my set up. |
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| KiwiJohn Guru  Joined: 01/12/2005 Location: New ZealandPosts: 691 |
There are devices (inverters ?) made for running 12 volt accessories in trucks and boats etc which have 24 volt systems. Sorry but I have no idea if they are available in the size you would need nor am I confident that their output would he high enough to charge your batteries. LATER: I found this one which does claim to have a 12v battery charging capability. Click here |
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| brucedownunder2 Guru Joined: 14/09/2005 Location: AustraliaPosts: 1548 |
The black box in the middle rack is a 24-12v dc-dc truck converter-- good for 20 amps and I just tweaked the internal pot to allow 14.5v for charging a 12v bank .. Have installed a pc fan in the back to cool the heatsink, This whole rack is for 12v from my 24v main solar system, the 24v from the bank runs those ups 240v cream boxes -been running for years now. Bruce Bushboy |
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| john Newbie Joined: 24/03/2008 Location: AustraliaPosts: 6 |
thank you bruce this looks good will the charger turn of when voltage drops to about 22v |
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| GWatPE Senior Member Joined: 01/09/2006 Location: AustraliaPosts: 2127 |
Hi John, these 24V-12V converters are available from Jaycar, etc.. Jaycar #MP-3068 20A continuous/fan cooled 90% efficient. check specs to see if will do the job. cheers, Gordon. become more energy aware |
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Trev Guru Joined: 15/07/2006 Location: AustraliaPosts: 676 |
Gordan, and John, This DC DC converter MP-3068 is suitable for charging. Output voltage is from 12-13.8v. My price $99 and freight would be minimal, it is only 600g. I have not said before, but I am able to supply all Jaycar products. John, I would recommend the power from the DC DC converter go through a regulator (solar regulator) so that the 12v system can not be overcharged. To stop the charge if the 24v system got too low, at this stage I can't think of any answer. The input voltage is 20-30v. I don't know, maybe it cuts out below 20v??? A larger 24v system than the 12v system may be enough, so the 12v system will be full before the 24v system becomes under charged too much. Perhaps an answer from the resident electronics gurus. Trev @ drivebynature.com |
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| john Newbie Joined: 24/03/2008 Location: AustraliaPosts: 6 |
trev and gorden I have been looking at a jaycar kc5377 universal voltage switch I am wondering if this switch will take the work it will need to do I am hoping that if I install this switch to a solar regulator will it be ok the solar reg is 40amp and sensors 12v or 24v and adjusts it self but I do not know weather it will adjust for 24v in and 12v out all the wrighting is in a nother language can you help. JOHN |
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| Ben Newbie Joined: 10/08/2007 Location: AustraliaPosts: 18 |
I have a 24 volt battery system and a 12 volt inverter.I bought a redark charge equaliser and pull power from one 12 v battery.The equaliser keeps the 2 batterys at the same voltage. |
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| john Newbie Joined: 24/03/2008 Location: AustraliaPosts: 6 |
Ben MY 12v system has 900amp hours storage and my 24v system has 400 amp hours can you tell me where you purched that equlizer from thangs JOHN |
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| Trev Guru Joined: 15/07/2006 Location: AustraliaPosts: 676 |
John, This is all the info I have. Don't know if it would do what you are aksing. STOCK-CODE: KC5377 RRP: $29.95 Universal Voltage Switch Ref: Performance Electronics for Cars - Silicon Chip Publications. This is a universal module which can be adapted to suit a range of different applications. It will trip a relay when a preset voltage is reached. It can be configured to trip with a rising or falling voltage, so it is suitable for a wide variety of voltage outputting devices eg., throttle position sensor, air flow sensor, EGO sensor. It also features adjustable hysteresis (the difference between trigger on/off voltage), making it extremely versatile. You could use it to trigger an extra fuel pump under high boost, anti-lag wastegate shutoff, and much more. Kit supplied with PCB, and all electronic components. Trev @ drivebynature.com |
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| Ben Newbie Joined: 10/08/2007 Location: AustraliaPosts: 18 |
The charge equaliser is REDARC I think I just GOOGLE them they are made in SA .I called them and they have dealers everywher I think. |
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| john Newbie Joined: 24/03/2008 Location: AustraliaPosts: 6 |
BEN I have also googled them and sent an enquirey about my situation hope I here back from them next week. thanks. |
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