Car Jump starter for Motorhome.

[The Browns.]

Why are you expecting to get a flat battery? Serious question.
If you have a good battery and a means of recharging it regularly,you are unlikely to have a problem. This will be through: EHU,or solar, or driving.
Coupled with keeping a check on your batteries daily.

The question was not about why I was expecting to get a flat battery but what kit people had to cover this problem if it did happen, just asking !!!!!

 

[Podney]

The question was not about why I was expecting to get a flat battery but what kit people had to cover this problem if it did happen, just asking !!!!!

Yes,I understand. That was my question. A lot of folk on here have trouble with flat batteries so your question was very relevant. I was coming at it from a “prevention is better than cure” direction.
Just trying to help!!!!!!!!

 

[cmcardle75]

The question was not about why I was expecting to get a flat battery but what kit people had to cover this problem if it did happen, just asking !!!!!

Indeed. But as many posters have stated, you've already got a massive backup battery. You don't need a third. Although you may need a very long jump lead if your leisure battery and engine battery are not adjacent. At least you only need the red one. The blacks are already connected!

 

[g3cwi]

The blacks are already connected!

Yes. And so you can use the red and black jump leads clipped together to double the length. Care needed with exposed connections.

 

[Boris7]

XP-10-HD Micro-Start (Heavy Duty)

The Heavy Duty model of XP-10 Micro-Start has more power and includes the much larger, unbreakable all-copper Smart Clamps. Built for mechanics and commercial or daily use, this is the go-to Jump-Starter Kit for those who will most often use their XP-10 with cars, trucks, boats, or other larger...

www.antigravitybatteries-uk.co.uk

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[Sapper520]

I’ll be using mine as a mobile power bank, the jump starter side is an added extra.

 

[TheCaller]

Although you may need a very long jump lead if your leisure battery and engine battery are not adjacent. At least you only need the red one. The blacks are already connected!

The negative of both batteries are often connected already via the vehicle chassis, but it would be as well to check. Some converters keep the leisure side totally isolated & run all negative returns directly back to the leisure battery, rather than relying on the vehicle chassis for the purpose.

You also need to look at the size of the cable connecting the leisure battery to the chassis. You may find that it is much thinner than the jump lead that you are using to make the positive connection. Leisure battery wiring is designed to supply a relatively small current over a long period of time, not the 800 odd amps for 5 seconds that the starter requires.

That makes it even more important that you connect the batteries & then wait a few minutes before trying to start the engine, to give time for charge to flow between the batteries, rather than expecting your leisure battery to be the only one trying to turn the engine over. This is especially important if you have gel leisure batteries.

 

[Jaws]

Bought one from Halfrauds.. Dunno the model but it is the largest one they do..
Successfully started the van ( almost dead battery... I had left the radio on mute for two weeks ! ), quickly followed by a neighbours car

 

[busby]

Just get jump leads that are long enough to join your hab bat to your starter bat.

That's what I have done..got my garage to make a pair up,,BUSBY.

 

[SpeedyDux]

Serious question.
I take it that the polarity of the connection going INTO the 12v cig lighter is reversed for this lead to take current in, as a normal plug going into the cig lighter is taking current out?
Or have I got this completely wrong?
Ta very much.
Iain

All I know is that this device does work either car-to-car, or in my previous van between hab battery and flat engine battery. At least no ECUs were fried which seems to be a risk nowadays when using simple jump leads.

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[The Browns.]

The negative of both batteries are often connected already via the vehicle chassis, but it would be as well to check. Some converters keep the leisure side totally isolated & run all negative returns directly back to the leisure battery, rather than relying on the vehicle chassis for the purpose.

You also need to look at the size of the cable connecting the leisure battery to the chassis. You may find that it is much thinner than the jump lead that you are using to make the positive connection. Leisure battery wiring is designed to supply a relatively small current over a long period of time, not the 800 odd amps for 5 seconds that the starter requires.

That makes it even more important that you connect the batteries & then wait a few minutes before trying to start the engine, to give time for charge to flow between the batteries, rather than expecting your leisure battery to be the only one trying to turn the engine over. This is especially important if you have gel leisure batteries.