Model Railway Forum

twalton1145 wrote: ↑Sat Mar 13, 2021 11:33 am This is a 15v 1a power adapter that is ideal for charging many jump starters that have a dc input and will replace the original one supplied.
This is a power adapter which delivers continuous fixed 15v dc power output, it can be used to safely and reliably charge the battery in your jump starter.
We recommend using a 14/15v adapter to charger the 12v battery
Charging should be higher than the battery voltage so as to prevent the battery wanting to discharge back into the adapter,.e,g, car 12V batteries charge at 13.8V. so ideally to charge your battery you need a DC 14V / 15V 1a adapter.
Leaving the charger on any longer than 10 hours can damage the battery, so we recommend a 9-10 hour charge time but always keep a check that the battery doesn't overheat.
The original adapter that was supplied with your jump starter maybe 12v but its likely to be the old style heavy unregulated chargers, that usually deliver alot higher than 12v to the battery.

tommyrob123 wrote: ↑Sat Mar 13, 2021 10:49 am i have searched the web and cannot get a straight answer to this question. is the out put from the hornby p9100w ac or dc please. if it is ac then i can use it to power my turbines

Brian wrote: ↑Sat Mar 13, 2021 11:50 am

twalton1145 wrote: ↑Sat Mar 13, 2021 11:33 am This is a 15v 1a power adapter that is ideal for charging many jump starters that have a dc input and will replace the original one supplied.
This is a power adapter which delivers continuous fixed 15v dc power output, it can be used to safely and reliably charge the battery in your jump starter.
We recommend using a 14/15v adapter to charger the 12v battery
Charging should be higher than the battery voltage so as to prevent the battery wanting to discharge back into the adapter,.e,g, car 12V batteries charge at 13.8V. so ideally to charge your battery you need a DC 14V / 15V 1a adapter.
Leaving the charger on any longer than 10 hours can damage the battery, so we recommend a 9-10 hour charge time but always keep a check that the battery doesn't overheat.
The original adapter that was supplied with your jump starter maybe 12v but its likely to be the old style heavy unregulated chargers, that usually deliver alot higher than 12v to the battery.

Hi
I've no idea what the post by twalton1145 is about? As the Hornby P9100w is a power supply to feed a train controller and nothing to do with charging batteries or jump starters!

tommyrob123 wrote: ↑Sat Mar 13, 2021 10:49 am i have searched the web and cannot get a straight answer to this question. is the out put from the hornby p9100w ac or dc please. if it is ac then i can use it to power my turbines

Simply look at the label.. It will specify the output voltage and whether DC or AC. Secondary DC output is defined by a short straight line over a dotted line. AC by a sine wave. Or it will simply say something like Output or Secondary (Sec) 16volt AC or DC etc
The image below shows the P9000W (Not quite the same but used for reference) and I've circled the output which on this one is 19 volts DC (Straight line over dotted line) at 500 milliamp (1/2Amp).


The one below is an AC output. Note the sine wave (wavy line).

twalton1145 wrote: ↑Sat Mar 13, 2021 12:58 pm <SNIP>
Taken from this link:
https://www.ebay.co.uk/itm/224277638861 ... eQQAvD_BwE