SapphyMike

I need something i can put on a car battery to keep the voltage above 13v.

i cant use a battery charger so it needs to be mobile.

any ideas what i can use?

GTechR

Maplin have a solar battery charger mate, and I dont think it actually needs that much sun power

http://www.maplin.co.uk/module.aspx?...98358&doy=9m10

SapphyMike

its 12v, and no good in the dark

GTechR

At what point did you say it was for night use?

T'was just a thought mate.

rssteve

what exactly is this for? only thing i can think of is a generator. Another option is running 2 12v batterys in series to get 24v, then get a inverter but they normally drop power to 13.8v. But this is not really portable as the batteries will go flat.

also any 12v charger etc will actually put out around 13.5 - 14v as the battery needs more potential to charge.

B16JUS

i think clifford do or used to do a alarm when the voltage goes below a certain volt it starts the engine and re charges

think it was called avantgarde or something

J

ALL4SHOW

i was looking for something like that .has anyone got one or used one ??? are they any good ???

rssteve

so you not going to tell us what you need to do so we can give you some ideas?

scruffythefirst

How about an internal combustion engine and an alternator?