Alerted by carbon monoxide detector in my caravan

Hydrogen can activate the CO alarm which is quite likely if you have overcharged the lead acid battery, I think you can specify CO alarms for LV and boat use that aren’t triggered by hydrogen.

My Carbon monoxide detector is operated by battery and indicates by series of bleeps when the battery needs replacing. My guess is if it was not an alert that the battery was dying, the alarm was doing it's job and you have another problem..

1) You don't want electrical stuff in your gas locker

2) No solar controller should push 33V into a battery. That's what it's there for.

thanks for your replies, been out this morning & put a multimeter on the battery & its 11.7 so panic over it must just be fault on display reading 33v 

Panic not over…. that’s only about 25% charged which should be in excess of 12.7v fully charged. If it’s been deeply discharged down to 8v as mentioned in your previous post and no longer holding a decent state of charge it’s likely to need replacing. There’s no point relentlessly trying to charge a carked battery, all you’ll get is heat & hydrogen.

I hope the OP doesn't pitch next to me. I don't want to get injured by an exploding battery, or an exploding gas bottle.

We could smell our battery was in trouble and acted promptly, they can certainly reach a danger point. (Smell of sulphur, rotten eggs.)

It might well be a failing battery and could be caused by a faulty battery charger.

I'd certainly move that solar connection away from the gas locker! 💥🔥

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My charge controller shows 22volt when full

I once spoke to Photonic universe, they told me when the battery is full the charge controller goes in reverse polarity display 21/22 volt so it doesn't overcharge

so is your 33 volt when it goes in reverse