power supply 1981 transporter camper ?

Post by **skins** » 12 Jun 2007, 12:59

Does anyone know if there is likley to be a power supply that i can use for computer etc connected to the leisure battery or do i have to buy one of those can converter things from halfords?
I have plug sockets but no power - i guess these only work when external power is connected.

Post by **tonytech** » 12 Jun 2007, 13:50

????
By "I have plug sockets but no power" I presume you mean 13 A domestic sockets. These will only work when 'hooked up' on site.

You could buy a 12V to 240V converter (300W will do) then plug your Laptop charger into that.

You may be able to buy a 12V cigarette lighter plug charger for your laptop.

What size is your Leisure battery? What wattage is your Laptop?
How long do you expect to run the Laptop for?

T

Post by **skins** » 12 Jun 2007, 15:22

not sure about the ampage of the plug sockets - it was a german import - there are two sockets beneath the sink area next to the fuse box and one above the fridge.

i'll be running laptop for few hours at a time -

The 12-240v converters in halfords are 150w - i will not be running that much stuff but how much will i be able to run using this?

Post by **tonytech** » 12 Jun 2007, 15:32

150w converter surprisingly will supply 150w of power. ie about 0.6Amps
(0.625x 240= 150w)
While suppling the 150W the unit will draw 12.5 Amps from your battery.
This will flatten all but the biggest leisure battery in about 5 hours.
Look at the rating of your laptop PSU.

T

Post by **skins** » 12 Jun 2007, 15:58

says on laptop psu - i assume the point of interest is the output - 18.5v 3.5a

Post by **tonytech** » 12 Jun 2007, 17:00

laptop requires 65W.

assuming 100% efficiency (probably nearer 90% for each voltage change)
Leisure battery will need to supply 5 A

60 Ahr battery will be dead flat in 12 hours.

In reality a 60Ahr battery will last about 7 or 8 hours.

T