TomKrajci 🇺🇦
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@KrajciTom@universeodon.com
I need advice on how to adjust the float voltage of this old battery charger.
The charger works just fine except the float voltage is about 13.15VDC, which is a bit low. (Shouldn't it be a bit closer to 13.8?)
So far, I can't find any schematic or circuit explanation.
I'll take any advice to reverse engineer this...measure voltages at various components...determine where I could change the value of a resistor or other component so that the float voltage is raised to the proper level.
Thanks in advance.
#Battery #Charger #Circuit #Electronics
Darryl Ramm@darryl_ramm@hachyderm.io
@KrajciTom@universeodon.com
I would not mess around with this. I'd not bother about small differences in float voltage... and fancy chargers might temp compensate that anyhow.
Given the limitations of a float only charger I'd likely toss this and get one capable of doing bulk as well as float charge. Like the one I have: https://www.amazon.com/dp/B000FRLO9Y
Which will do 7A constant current charging... handy if needing to get a flattish battery charged again (although these and many other modern chargers will not charge a super-discharged battery (~<2V in this case)). I like that charger but have not characterized it's charge cycles/performance, but you don't need all the over the top fancy feature claims.
What is this for? For your car in the garage over winter?
You charging what battery specs? (what is C and is this VRLA, flooded LA, LiFePO4, etc. does it have a BMC?)
Is there a problem with the batteries?
Have they been checked with a discharged into a load that simulates real world load? Or maybe just ~C/20 discharge rate... since that's the rate used to define the battery marketing capacity. But good battery manufactures will provide discharge curves at multiple constant current loads. Old car headlight or similar make OK "constant current" loads. Yes this is not testing CCA but it's still very useful. Until you do that you don't have a good handle on battery health or what measuring a voltage and guesstimating a SOC from that really means.