Message Forums

I'm sure I've seen such a thing in the past, but I'm struggling to find anything now! I guess one option would be to use a mains charger and small inverter.

Glen

Hi

We have a 12 volt "jump start pack" that recharges from the mains or from car cigarette plug when on the move. It came with the pack but I imagine Maplins or the like should be able to supply something to do the job.

regards sf

To connect an inverter so as to provide 240 volts for a charger which will put out 12 volts is an inefficient use of electricity and expensive.  You can connect  the battery directly to the socket.  This will enable the battery to get the best form of charging ie 14.4 volts which will help maintain the battery in in peak condition by desulphating the plates.  ( it's why car batteries last a long time)

However, you should use a thick cable (20-30 amps) and the battery should be in a container in the boot with a vent pipe to outside the car.

Regards Bob

Whilst not wishing to disagree with anyone, the original question referred to a small (20Ah), presumably sealed, lead acid battery, not a leisure battery or similar. The maximum charging current of these is around 6A, so charging directly from the car would almost certainly damage the battery.

Whilst I agree an inverter/main charger isn't the most efficient way the question was also about charging whilst on the move, so the inefficiencies are not a major issue. A proper 12v powered charger would be better - if you can find one!

Glen

Quote: Originally posted by glen_p on 18/11/2009

---

Whilst not wishing to disagree with anyone, the original question referred to a small (20Ah), presumably sealed, lead acid battery, not a leisure battery or similar. The maximum charging current of these is around 6A, so charging directly from the car would almost certainly damage the battery.

Whilst I agree an inverter/main charger isn't the most efficient way the question was also about charging whilst on the move, so the inefficiencies are not a major issue. A proper 12v powered charger would be better - if you can find one!

Glen

---

I think I've found one!

The X-Peak 3 on here...

http://www.strikalite.co.uk/prodcat_type/10/ALL/0/Battery_Chargers.html

Is 11-15v input and can be configured to charge 12v lead acid.

A google search will throw up other references to it - and possibly a cheaper price!

Glen