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trundlinggrundle t1_j6d258u wrote

Reply to comment by nonemoreunknown in Share: DIY A 12.8V 120Ah LiFePO4 Battery For My Travel Trailer(AGM Battery Replacement) by QH-Technology

Roughly 50v is required to overcome the resistance of dry skin. Unless you're putting 12v electrical contacts directly across your heart, inside your chest, you'll be fine. Think of current as a volume of water, and voltage as a pump that pushes it though pipes.

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Hinote21 t1_j6d3yjm wrote

Not that I ever thought about this before but this must be why it's totally safe to stick a 9V battery on your tongue. Not that I ever did that... Multiple times... In middle school...

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SatanLifeProTips t1_j6dn4eb wrote

This. Unless you are making out with your battery, 12v is incredibly safe unless you arc come metal across the contacts. Doing a more powerful PV system right these days means stepping up to 48V and even that is pretty safe to handle with bare dry (not wet) hands. Maybe thin skinned baby hands will feel it? Caloused man hands don’t give 2 shits.

My solar PV array is 48v. A lot of the electric forklifts I work on are 48. It’s fine. Electrical Code changes at 60V and then you need to take it more seriously.

And if you don’t feel like fucking around spot welding a battery pack you can buy off the shelf LFP batteries that are a drop in replacement for lead acid including the BMS baked right into a plastic shell. They even look like a lead battery but are 1/3 the weight. Motorcycle versions even have a low battery protection system and will shut off at 20% life left when the bike is parked. Press a button on the battery and it wakes right up again.

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