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Old 11-22-2017, 09:45 AM   #1
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Default Minimal battery just for lift

What is the battery needs just for the lift?

I plan to have completely separate batteries for the coach than the hydraulic pump. I assume a cranking battery is better than a deep cell battery for the pump? Will a small lawnmower batter be sufficient to raise the roof twice?

Thinking small for weight and for quicker charging and of course cheaper to replace down the road.

I have read between 75 and 150 cc amps for the lift
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Old 11-22-2017, 09:58 AM   #2
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I'm just going to give you an opinion here, and it's worth what you're paying for it - but it may give you something else to think about.

I suspect the lawnmower battery may well have enough current output to lift the top twice, before being recharged, and I think an auto battery would certainly have enough output. But, and this is my concern - I don't think either are designed for the kind of deep discharge you will be putting on them and I would think they will fail to accept and hold a charge more quickly than a standard deep discharge battery. With that in mind, using one could possibly end up costing more in the long run. Both of these batteries are designed to be recharged immediately after the starting duty they are put to.

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Old 11-28-2017, 03:40 PM   #3
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I have a battery on mower, so might give it a shot… unless anyone has actually tried it already
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Old 11-28-2017, 05:52 PM   #4
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If you ONLY use the battery for lifting (and not for ANY steady-drains, like the inverter or lights), a starting battery should be ok. This is afterall a starting circuit, with a starter-type motor. Until the 90’s it wasn’t unusual to run a starter for 20-30 seconds to geta. Car to start.

Whether the lawnmower battery has sufficient capacity is another question. You could try to see how many lifts you get from a single charge...but keep in mind doing so will damage the battery. In my experience, discharging a starter battery one time reduces it’s lifespan about 1/3 (no hard facts on this, just observation from the many, many batteries I’ve replaced in the shop - kill it once and you’ll be back within the year for a new one).
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Old 03-15-2018, 10:58 PM   #5
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Is there any other reason besides the ones you listed above why you are thinking of going to such a small battery?

I would think a group 24 size would be the smallest that would give you good life and good service. Remember you are not carrying this on your back and the little weight saving you gain is going to be small in the grand scope of things. Also don't waste your money on a starting battery when you need a deep cycle battery.
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Old 03-16-2018, 07:03 AM   #6
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Quote:
Originally Posted by Bravada View Post
Is there any other reason besides the ones you listed above why you are thinking of going to such a small battery?

I would think a group 24 size would be the smallest that would give you good life and good service. Remember you are not carrying this on your back and the little weight saving you gain is going to be small in the grand scope of things. Also don't waste your money on a starting battery when you need a deep cycle battery.
I agree! Why spend the money for a battery that may prove inadequate when you can get a better one for a few dollars more.
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Old 03-16-2018, 08:39 AM   #7
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Solely for weight, and to save that hanging box the stress.
All the battery will ever do the rest of its life is run the hydraulic pump. The camper has dedicated batteries for power separate from the pump batt, and the pump is basically a starter motor, so a starting battery makes the same sense as the starting battery under the vehicle hood…
I still may try it just to see what happens, I have a batt in the mower I can play with.
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Old 03-16-2018, 11:27 AM   #8
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Good try it and give us you feed back and experience.
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Old 03-16-2018, 01:17 PM   #9
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What battery will your emergency breakaway switch be connected to? You need to have that, and it will require a well charged battery to apply the brakes reliably.
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Old 03-16-2018, 03:50 PM   #10
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I think it's a good idea. Let us know/give us a update!
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