|
Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
|
Thread Tools |
11th Apr 2018, 9:49 pm | #21 |
Nonode
Join Date: Dec 2012
Location: Kirk Michael, Isle of Man
Posts: 2,346
|
Re: Charging Sealed Lead Acid Accumulators (SLA's)
Herald #16. When you get to much smaller sizes, I guess the higher surface area comes into play. Gel cells SWELL if overcharged, wet batteries boil off acid.
Bikerhifinut, Yes, most bikes have a simple voltage control, but (unless quite flat), the battery terminal voltage will rise quickly, reducing the charge rate to something more acceptable. Back in "dynamo days", cars had a more sophisticated controller that allowed maximum current at start up, but quickly reduced that maximum, before either the dynamo overheated, or the battery did. As mentioned in another thread recently, I bought a battery "tender", marketed as a Yuasa. It claims a de-sulphation phase (higher voltage pulse charging), but careful scope checks clearly show it does not happen. For general purpose use, however, it is a useful device that gets over my forgetting to switch off the charger. * I just went out to the shed, suddenly remembering there was one on current limited charge, which should have been switched off about 6:00pm. BikerHFN again. I have measured all those varying control voltages on 'bikes. I conclude that modern bikes with fuel injection demanding power are the ones producing up to 15.2v. My 30+ year old Ducati engined bikes all have around 14.0 to 14.3 volts. Not checked a modern Enfield. Les. |
12th Apr 2018, 8:35 am | #22 |
Octode
Join Date: May 2011
Location: Lancashire, UK.
Posts: 1,349
|
Re: Charging Sealed Lead Acid Accumulators (SLA's)
You may not observe a pulse charge mode unless it is connected to a deteriorated battery.
Try connecting it to a variable PSU set to around 17 volts (with series feed resistor of say 50 ohms) and see if anything happens then on the scope. |
13th Apr 2018, 10:00 pm | #23 |
Nonode
Join Date: Dec 2012
Location: Kirk Michael, Isle of Man
Posts: 2,346
|
Re: Charging Sealed Lead Acid Accumulators (SLA's)
Mooly, I quite specifically choose a battery that I know is well sulphated. It is useful for use in an alternator regulator testing jig I have built, as it quickly reaches "full charge", and equally quickly looses voltage with a simple 30W lamp load.Connected "tender" to battery, likewise scope, switched on. DC only, absolutely no pulsing!
Les. |
14th Apr 2018, 1:09 am | #24 |
Heptode
Join Date: Oct 2009
Location: Melbourne Australia
Posts: 898
|
Re: Charging Sealed Lead Acid Accumulators (SLA's)
Jolly, the battery you purchased would have manufacturer and model details on it - have you been able to get a generic document from the manufacturer as to their recommended charging instructions - always defer to the manufacturer's instruction before anything else imho.
That said, I have the Aldi charger and use it for my instrumentation 6V and 12V small vrla monoblocs, as well as the other half's motorbike vrla battery as the charger allows continuous connection with a low trickle (which although is not pedantically temperature compensating, gives me some confidence that the battery and bike residual power requirements are being met). |
14th Apr 2018, 8:26 am | #25 | |
Octode
Join Date: May 2011
Location: Lancashire, UK.
Posts: 1,349
|
Re: Charging Sealed Lead Acid Accumulators (SLA's)
Quote:
I would do more tests though, both with other batteries and also a PSU to be 100% sure. Maybe the battery is to far gone and the charger recognises that. Lots of data sheets on Yuasu site showing and explaining the charge cycles of the various devices available. |
|
14th Apr 2018, 10:27 pm | #26 |
Nonode
Join Date: Dec 2012
Location: Kirk Michael, Isle of Man
Posts: 2,346
|
Re: Charging Sealed Lead Acid Accumulators (SLA's)
Mooly, I am satisfied it IS a Yuasa, but whether the Yuasa is a clone of company XXX identical model or vice virsa, I can not say. Sorry, I can't remember the make right now, but identical in every way except for the name on the charger and box. I have tried it on a number of batteries, but only one other where I have simultaneously "'scoped it".
Les. |
15th Apr 2018, 1:05 am | #27 | |
Octode
Join Date: Feb 2018
Location: Southampton, Hampshire, UK.
Posts: 1,051
|
Re: Charging Sealed Lead Acid Accumulators (SLA's)
Quote:
|
|