I built an electric car with lead acid batteries (waiting for LIFEPO4 batteries to become more affordable for me) and I'd like to ask a few question to the community about how to make them last longer.
The battery pack is a nominal 120V system and I am using 20 6V Deka GC25 batteries which are 235ah. I charge them with an Elcon PFC 3000 (5 stages S1=127V, S2=142V, S3=144V, S4=148V and S5=133.5V) at 240V (about 13 amps). It can also charge at 110V (about 18 amps).
I get a range of about 50 miles per charge on ideal conditions at about 50mph, and about 40 miles in traffic, some highway, etc.
Questions (I need answers to make the batteries last longer)
1. Is it better for the batteries to charge at 110V or 220V (slower or faster charge)?
2. I get up to 1,000 amps from the controller when I accelerate for brief periods. Does this seem excesive for these batteries (cruise at 50mph uses about 250 amps)?
2. I work close to home, so I can charge for a short while I come home for lunch. Is this good, or I should avoid partial charges and only plug in when I can do a full charge.?
3. When fully charged, my voltage is 135V. I marked my discharge level at 110V, but I have actually discharged them max to 115V. Does this seem OK or I am exceeding the safe lower limit? I understand that overdischarging them is what kills them faster.
5. After the pack is fully charged, should I unplugg the power, or just leave the charger connected? When it is fully charged, I can still hear a little of the "boiling watter" sound comming from the batteries, so, I know the charger still applying some power to them, but I don't know if this is good or bad for the batteries.
Thank you. I appreciate the help.