![]() Each cell of a lead-acid battery will produce 0.42-litres of hydrogen gas for each and every Ah beyond the battery’s capacity.Ģ0Ah x 0.42-litres of hydrogen (per Ah per Cell) x 6 cells = 50.4 litres of H2 or hydrogen gas. So 100Ah needs 120Ah put into it to be ‘fully charged’. It’s generally granted that to fully charge a lead-acid battery, you need to put in about 20 per cent over the recommended Amp Hour (Ah) rating. ![]() There will need to be a bit of maths but stick with me. You’d probably be surprised hell, I was when I did the research for you good folks. Surely it can’t make that much hydrogen gas? ![]() It doesn’t take a genius to realise that one tiny spark… and the whole thing will go BOOM! All of a sudden you’re putting a bunch of 12-volt gear (charger, solar controller, Anderson plugs, ciggy sockets, etc.) in a sealed container that will fill up with hydrogen gas. Where this becomes a problem is when you go and buy a ‘sealed’ box or space-case. That’s why on the side of a lead-acid battery it says to store, use and charge in a ‘well-ventilated area’. So as soon as your charger goes over 14.1-volts (2.35-volts times six cells), it’s generating a hell of a lot of hydrogen gas. In our specific case, your 12-volt lead-acid battery has six cells. This occurs when your battery voltage goes above about 2.35-volts per cell. It’s actually hydrogen and oxygen (two parts hydrogen, one part oxygen – from water H20). Most folks probably realise that when you’re charging a lead-acid battery, it gives off hydrogen gas. How exactly am I turning the battery box project into a bomb?!
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