I've Googled for info but little available. All I need to achieve is to produce a stable 24v dc at around 8A from a regular 12v car/van battery or supply. I also have a good power output 7kVa generator on board but it's too unstable to use for the job I need to do, even if I was to use a 24v charger off the supply I can get many devices to do 230v from 12 or 24v at all sorts of amperages for loadsamoney. So, how can I build a reasonable stable output unit to power the computer system on a crane when the original power system has gone tits up or is unavailable? I sometimes need to power a system up without a lorry unit being attached to be able to perform diagnostics of crane failures or problems from the onboard computer unit. The tests may take up to an hour at a steady 8A. Fluctuation over + - 4v or a couple of amps and the system shuts down. Carrying 24v batteries may be a solution but impractical really. TIA -- R o b b o Trophy 1200 1998 BotaFOF #19. E.O.S.M 2001/2002/2003/2004. B.O.S.M 2003, 2004, 2005 FURSWB#1 KotL..YTC449 PM#7 ..
In uk.rec.motorcycles, R obbo amazed us all with this pearl of wisdom: uk.radio.amateur is that way -------> Seriously.
R obbo wrote Not really, it actually sounds quite the best idea. An 8ampere/hour load is less than your most pathetic of bike batteries could handle standing on its head. It really is not very much at all. Whack a couple in series for your 24V and the only problem you have is charging them Unless you are doing this every day: a couple of square feet of solar panel, a voltage control chip of some sort, a couple of small components, all you need. If you intend to do it regularly then get bigger panels.
I've Googled for info but little available. Now *that's* an idea! Maplin do a solar charger unit quite cheap, so I could arrange a panel on the van roof for charging to a couple of 12v batteries in series. I'll look at Maplin for bits Ta Steve -- R o b b o Trophy 1200 1998 BotaFOF #19. E.O.S.M 2001/2002/2003/2004. B.O.S.M 2003, 2004, 2005 FURSWB#1 KotL..YTC449 PM#7 ..
R obbo wrote While you are shopping at Maplins you may wish to consider dispensing with the panels and buying a DC/DC converter. Such that you can charge the 24V battery from the van 12V system, when the ignition is on say. As much as I would like to see it, I don't fancy the panels you can get from Maplin are really up to the G forces coming their way when glued to the top of a van.
R obbo fumbled, fiddled and fingered: http://www.directsupplyukltd.co.uk/category50_89/product168/product_info.html http://www.justoffbase.co.uk/s.nl/sc.9/category.162/it.A/id.6556/.f -- Steve Parry K100RS SE & F650 and a 520i SE Touring for comfort (not forgetting the SK90PY) http://www.gwynfryn.co.uk
Use a parallel charge series discharge set up. Whack a relay in there to do it automatically if you want.
