6vdc automotive battery charging voltage ?
- Thread starter turbo1600
- Start date
Each mfg and model has their published specs.
Can also depend on circumstances, slow charging is better, fast needs higher.
Float vs Absorb vs Equalizing.
AGM vs GEL vs FLA.
Starter vs deep cycling.
7.2 - 7.4 as a general ballpark for FLA deep cycling Absorb voltage.
But best to get the details from your batt mfg
Can also depend on circumstances, slow charging is better, fast needs higher.
Float vs Absorb vs Equalizing.
AGM vs GEL vs FLA.
Starter vs deep cycling.
7.2 - 7.4 as a general ballpark for FLA deep cycling Absorb voltage.
But best to get the details from your batt mfg
spinningmagnets
100 TW
Wet lead acid is a very well-known chemistry. Those who live off grid (wind-gens and solar panels) occasionally overcharge them, and then top them off with distilled water. Just use half of the posted specs for a 12V car battery.
Most car alternators put out around 14V to overcome line resistance, and most car voltage regulators charge the six cells up to approximately 13V. For starting a car, you only pull amps for a couple seconds, then it is immediately topped off.
For deep-cycle (off-grid, boat trolling motors, etc). I have read that they are often drained to 11V. For the charging voltage of a 6V battery (three cells) I'd use 6.5V. If you see bubbles (off-gassing due to electrolysis of water into H2 and O2), then back off the volts down a hair until you never see any bubbles.
Most car alternators put out around 14V to overcome line resistance, and most car voltage regulators charge the six cells up to approximately 13V. For starting a car, you only pull amps for a couple seconds, then it is immediately topped off.
For deep-cycle (off-grid, boat trolling motors, etc). I have read that they are often drained to 11V. For the charging voltage of a 6V battery (three cells) I'd use 6.5V. If you see bubbles (off-gassing due to electrolysis of water into H2 and O2), then back off the volts down a hair until you never see any bubbles.
Again, 7.2 - 7.4V as a general ballpark, lead chemistries last much longer when most of their lifespan is spent at 100% Full.
Stop charging at 0.005C if you want to be precise. But going over for a while won't hurt FLA so long as you keep the water topped up.
Whether a Starter or deep cycling does not matter, but if the latter, habitually going much below 50% SoC will lead to much shorter lifespan, even faster than habitually not getting all the way to 100%.
Periodically equalizing is good to help extend lifespan for an expensive bank, but again, best to get the specific protocol from the maker, good ones have tech support staff and detailed documentation readily available.
Stop charging at 0.005C if you want to be precise. But going over for a while won't hurt FLA so long as you keep the water topped up.
Whether a Starter or deep cycling does not matter, but if the latter, habitually going much below 50% SoC will lead to much shorter lifespan, even faster than habitually not getting all the way to 100%.
Periodically equalizing is good to help extend lifespan for an expensive bank, but again, best to get the specific protocol from the maker, good ones have tech support staff and detailed documentation readily available.
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