The wattage depends upon how much current you want to discharge at.just got my discharger in the mail today from hybrid automotive, what size light bulb are you guys using to do this? high watt? low watt? anything specific?
I've been using a 75 watt bulb, I think it's pretty much all over the board. Some are using low watt bulbs some high watt bulbs. I have an extra car to use so I just used what I had. I start it during the day and it's done the next moning when I wake up. I got my last one down to .17 volts.just got my discharger in the mail today from hybrid automotive, what size light bulb are you guys using to do this? high watt? low watt? anything specific?
We all had to start somewhere. I remember when I didn't know what questions to ask much less the answers.olrowdy,
i apologize for simple questions. i found your chart and am having a bit of trouble understanding it. i assume where are two numbers for the wattage (ex 25-40) your referring to the type of bulb in your discharge? if so would it say that the 100-100 combo provides the best results?
25-40 means that one bulb was a 25 watt bulb and the other a 40 watt bulb (and they are wired in series).
Well "best results" are when it discharges the way -you- want it to. Basically I favor starting off at a rather low current rate and when the current drops too low in value to switch to higher wattage bulbs to get the discharge current back up again. The discharge current to use is a personal decision though.
also, i have heard other members getting there packs down to below a full volt for ex .5. would the best habit be to use a relatively low watt for a slower drain but get it down lower? or does it not so much matter?
The higher the wattage bulb(s) you use the quicker the pack will discharge and also pull the pack to a lower voltage because there is more load on the pack. Another trick is to use various 12 volt car bulbs as the discharge load when the pack gets down below 15 volts. But don't take too long in switching to the 12 volt bulbs because the pack voltage may bounce back to a pretty high voltage for a short while until the 12 volt bulb(s) can pull the voltage back down again.
I think in general the jury is still out on how much current is the right amount.
i apologize with the petty questions, new to the discharging game, let alone new to working with electronics and the various terms. learn something new every day.
We all had to start somewhere. I remember when I didn't know what questions to ask much less the answers.
I favor using two bulbs in series because a full pack has too much voltage for the rating of a single bulb. It wouldn't help if you start a discharge on a full pack and the bulb burns out so you end up wasting all that time if you don't notice the bulb is shot.
I think one thing that so far people haven't figured out yet (or aren't talking about it) is does it help to hold the voltage per cell at some low discharge rate for a longer time at low voltage per cell to allow some chemical reactions to take place at the low voltage per cell (something a around 0.2 volt/cell which would be on the order of 24 volts for the whole pack IF none of the cells had dropped out to 0.0 volts).
eq1 posted some pages from a Ni-MH book he has that seemed to indicate that there might be some advantage in doing that. Unfortunately most of us don't have the proper equipment to really tell long term, if one current drain vs what voltage to go to is better than other currents and voltage.
But I do think the group is getting closer to the better way, for our purposes, to bring batteries back to life. Basically grid charge to balance a pack and grid charge then deep discharges to bring a sick battery back to life if the battery isn't just shot.
I have an article on my website that should help. It's in the "charger/discharger" article. The link to my website is in the signature lines below.Guys,
I have been using a grid charger for awhile now. I'm aware of the drain need, but I've never used a lightbulb. I've always just run the battery down myself on the road. What is the exact technique for this? How do you hook up the bulb? Do I have to open the battery compartment up again or can I somehow do it with the way the grid charger plugs in?