How low can you let the battery go. 10 v

[Monty don]

Interested to see what everyone thinks. Not my best subject

On site for 3 days now got a single leisure battery with 120 amp solar

Battery started at just under 13 amps now on 11.5

How low would you let it go

10 amps

I can use a generator to change it up was interested to see how many days one battery could go

Don't want to let it drop to low and damage it

Cheers
GB

 

[MC 55 FUN]

Do you mean volts ? 11.5v is seriously discharged

 

[Two on Tour]

Are you getting a little mixed up here ? Do you mean 120 watts of solar and volts rather than amps on your battery figures ?

You go below 12 volts on you leisure battery and your causing it damage, go down to 10 volts and your killing it.

 

[Kannon Fodda]

10V is totally flat and dead. Most likely you will have done damage.

Rule of thumb is lead acid batteries more than 50% discharge will shorten life, so that is around 12V. If you are down to about 11.5% you have probably got 20% left. Gel might tolerate discharge to that, but Lead acid won't be happy. It can also depend on rate of discharge, heavier rate puts more strain on the battery.

Most batteries will show loweer voltage under a load than once they get to stabilise free of load. So check once you have disconnected and switched off for true status having left it for 30 minutes to an hour.

 

[Monty don]

probably getting mixed up. I did say its not my topic

Volts amps watts etc

battery is at 11.5 after 3 days use

Ill charge in the morning

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[mikebeaches]

You go below 12 volts on you leisure battery and your causing it damage, go down to 10 volts and your killing it.

What he said!

 

[Monty don]

its a shit small Varta battery under the seat that I will change for lithium soon anyway

 

[Two on Tour]

probably getting mixed up. I did say its not my topic

Volts amps watts etc

battery is at 11.5 after 3 days use

Ill charge in the morning

If you intend to take more out of your battery this evening then CHARGE IT NOW !!

 

[Dorset Diver]

Interested to see what everyone thinks. Not my best subject

On site for 3 days now got a single leisure battery with 120 amp solar

Battery started at just under 13 amps now on 11.5

How low would you let it go

10 amps

I can use a generator to change it up was interested to see how many days one battery could go

Don't want to let it drop to low and damage it

Cheers
GB

Have you identified what is draining your battery?

 

[Jasz]

The battery saver on mine cut in at 9V once in storage. It's still ok over 2 years later - I was obviously lucky judging by various posts on this forum (not to be recommended!)

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[Whizzo]

Have one 95Ah AGM leisure battery & 100w solar panel. Just spent three days & nights on site no electric hook up. voltage never dropped lower than 12.5v. used tv one night for a couple of hours, charged usual gamins, bike lights phones etc. obviously everything else on gas. you must be using a lot of power?

Is your panel charging ok through the day?

 

[Reallyretired]

I would ask if your solar panel is actually working. With the weather lately you shouldn't be low on battery.

 

[autorouter]

Battery started at just under 13 amps now on 11.5

I'm sure that's 13 volts. If so, that means the solar panel is working. A battery that's not being charged will not go over 12.9 volts, so that's a good sign. It sounds like you are simply taking out more power than the solar is putting in, over the course of a day. You need to give it a boost with the generator.

Apart from being noisy and smelly, a generator is not very efficient at putting charge into a battery. Typically the mains charger is 20 amps or less. That means it's only using 20 x 12 = 240 watts of its energy (amps x volts = watts), and it's probably a 1000 watt generator. But when the battery is down to 11.5V, it's very flat and needs a charge.

Don't be misled by the voltage when the battery is charging. It will go up to 13 or 14 volts very quickly, but needs a few hours to put the charge back into the battery. A couple of hours at least.

 

[pappajohn]

Unless it's dark where you are at 11.5v your solar isn't working.
Is that 11.5v with anything turned on? If so turn EVERYTHING off for an hour and check again.
12.2v is around 50% discharged and as low as you should let it go.

 

[pappajohn]

I'm sure that's 13 volts. If so, that means the solar panel is working

OP said it started at 13v.....they may have just arrived on site after driving miles and getting a charge from the alternator.

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[Monty don]

OK over night it settled to 11.4 so this morning I got the generator out
Its not smelly and pretty quiet and im the only one right now on Willow Fields
2kw generator

I have a 95 amp hour varta battery just one factory fit

Im going to put another one next to it under the drivers seat

Burstner 729 2019

I need to change my pic but cant get that to work either

Yes I do run a fair bit of power tv on for 4 hours a day I guess

When the sun comes out raining right now and its all fully charged ill see what it reads once settled and see how solar is working cant check it right now though

So 11.4 on an agm as a low should be ok right?

 

[Simon Meadwell]

Our van was locked down from end of February until 4 th July. On collecting it had to fit new starter battery it just wouldn’t start with jumpleads and two starter packs. The hab battery was flat but has charged up and now lasts three days off grid like it always did strange but true.

 

[pappajohn]

I need to change my pic but cant get that to work either

You need to delete your current avatar then apply the new one.
If the pic file is too big you need to use an app to reduce the file size.

 

[peterc10]

So 11.4 on an agm as a low should be ok right?

Not if you drop it that low too often. It will considerably shorten the life of your battery.

 

[Dorset Diver]

deleted.

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[Jasz]

Do you have a switch to select which battery is being charged from the solar? Ours was originally wired incorrectly and was charging the cab battery when I thought it was charging the leasure battery. It now usually reads around 13.4V while charging on solar (100w panel and 85Ah battery).

 

[7735]

We spent 7 nights off grid at the beginning of July, we have 2 x 95 amp batteries and 100 w solar. Batteries never dropped below 12.5 v and we didn’t have sunshine all the time.
Spongy

 

[peterc10]

We spent 7 nights off grid at the beginning of July, we have 2 x 95 amp batteries and 100 w solar. Batteries never dropped below 12.5 v and we didn’t have sunshine all the time.
Spongy

Was that 12.5v figure during the day? If so you were measuring the voltage of the amount the solar panels were putting in, not the state of batteries.

 

[kevenh]

I need to change my pic but cant get that to work either

You do not need to delete your current avatar to use a new one.
Pic 1: Get to your Profile view - this looks like below.
- I got here: -

Pic 2: by clicking on my user name: once here: -

Pic 3: Then again here:

No Pic 4: So, back to the Stage 1 screen shot If you move the mouse over the current avatar, the word Edit appears. Click on it.
No Pic 5: in this area you can "choose file" to upload your new image for the avatar. {y)

 

[Monty don]

Thanks for that now cant get it to accept any of my photos but that's an issue with my phone

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