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post #1 of 20 (permalink) Old 15-04-2019, 11:52 Thread Starter
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Lowest volts?

What is the least voltage you'd say it's advisable to let your leisure battery drop to?
I know it harms them to let them drop too low but how low is too low?
9 volts too low?
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post #2 of 20 (permalink) Old 15-04-2019, 12:36
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At rest I would guess at 12v would be my minimum. Below 11v will start to harm the battery. imho.

Ray.
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post #3 of 20 (permalink) Old 15-04-2019, 13:06 Thread Starter
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Sorry Ray, what do you mean by 'at rest'? Do you mean with no drain on it?

I'm wondering about a safe level whilst you're using stuff off-grid (lights, telly etc.)
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post #4 of 20 (permalink) Old 15-04-2019, 13:11
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12v as a minimum before you need to start charging which is pretty much 50% capacity. I tend to never let mine get below 12.1. If it gets to 9v its bad news for you battery.

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post #5 of 20 (permalink) Old 15-04-2019, 13:12 Thread Starter
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Cheers Barry
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post #6 of 20 (permalink) Old 15-04-2019, 13:22
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Quote:
Originally Posted by chilly View Post
Sorry Ray, what do you mean by 'at rest'? Do you mean with no drain on it?

I'm wondering about a safe level whilst you're using stuff off-grid (lights, telly etc.)
As Barry's chart shows chilly, more details than I could explain. But yes when I said at rest and with no load. Obviously when using some heavy loads the volts will drop even further but with no load again should recover to at least 12v.

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post #7 of 20 (permalink) Old 15-04-2019, 21:10
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It will also depend on what type and model battery your van is fitted with. For instance the very popular Varta 90 VRLA battery is 50% discharged at 12.5v (off charge and off load) and that’s as far as it’s recommended to drop. Conventional batteries are normally 12.1v - 12.2v as Barry’s chart shows.

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Last edited by ob1; 15-04-2019 at 21:15.
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post #8 of 20 (permalink) Old 15-04-2019, 21:10
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So it’s discharged if it drops just 0.1 volts??

Only yesterday I was thinking about trying to find the very chart that Barry has just posted as the last one I had went with the MH when I sold it. Spooky or what?

So a big thank you Barry, now printed off, laminated and placed alongside the control panel in my (shhh, whisper the next word) caravan

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post #9 of 20 (permalink) Old 15-04-2019, 21:16
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I have had a copy of that for years and it is a part of my Bible for the MH......

I will never allow ours to drop below 12.5v as like others I am concerned that some damage may be initiated.

I believe that if you have "cheap" batteries they are more susceptible to damage at lower voltage as the surface of the plates is less stable.

It does depend on the exact type of battery, but to me, err on the side of safety and the battery bank is likely to last longer......

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Any comments above are only MY OPINION and should be read as that.

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post #10 of 20 (permalink) Old 18-04-2019, 15:46
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Quote:
Originally Posted by Penquin View Post
I have had a copy of that for years and it is a part of my Bible for the MH......

I will never allow ours to drop below 12.5v as like others I am concerned that some damage may be initiated.

I believe that if you have "cheap" batteries they are more susceptible to damage at lower voltage as the surface of the plates is less stable.

It does depend on the exact type of battery, but to me, err on the side of safety and the battery bank is likely to last longer......
12.5 is quite a high limit to set yourself Dave. Should be ok well below that. I find that ours can be full charged then after a heavy day or evening of usage it can be down to 12.3, 12.2 or even 12.1 by midnight. It's back up to full by lunchtime though in summer on the solar. Never seems to do any harm and I don't half batter mine.
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