Search found 265 matches
- Thu Dec 24, 2009 11:54 am
- Forum: All things battery related
- Topic: recharging a forklift
- Replies: 11
- Views: 31214
If the battery voltage is too low, it could be that it is very flat, or it could be that you have a failed/shorted cell (or several). In this case, it would not be a good idea to charge the battery because you could vent the failed cell, or overcharge the good cells. A really good intelligent charge...
- Thu Dec 24, 2009 10:28 am
- Forum: Cars,Vans and other road vehicles
- Topic: Reverse
- Replies: 9
- Views: 30263
Your question has been answered - yes you can reverse a series wound motor using the appropriate contactors. What you can't do, to my knowledge, is use a series wound motor to give you regenerative braking. This involves reversing the field current but not the armature, or vice versa. As these wind...
- Tue Dec 08, 2009 12:59 pm
- Forum: All things battery related
- Topic: Charger Suppliers?
- Replies: 8
- Views: 25528
It's not an EEPROM, an EPROM, or even a PROM it's a new one time programmable processor (SGS Thomson ST6 series). The last one I looked at wasn't code protected. Given the limitations of the design, I wonder what the Lithium profile actually is. I do have a new analogue board designed, but have yet ...
- Tue Dec 08, 2009 12:03 pm
- Forum: All things battery related
- Topic: Charger Suppliers?
- Replies: 8
- Views: 25528
The Zivan NGx series chargers have a really pretty robust power stage. However the control logic is just plain weird and is unbelievably inflexible for a microprocessor based design. The feedback circuits are analogue and are controlled by a pair of digital potentiometers. I reverse engineered the c...
- Sat Nov 21, 2009 9:15 pm
- Forum: Conversions
- Topic: Power/weight ratios
- Replies: 45
- Views: 97015
I put the question simply to make you consider the validity of your original question. I said nothing in my question about a single ratio transmission. If the vehicle was a cricket pitch roller, then an engine of 3hp might suffice. A forklift might use 20hp, whilst a town car with a top speed barely...
- Wed Nov 18, 2009 12:22 pm
- Forum: Conversions
- Topic: Power/weight ratios
- Replies: 45
- Views: 97015
my original query was as to some sort of rule of thumb for motor power (meaning torque of course) to vehicle all up weight which will allow single speed transmission. I'm very sorry, you can't have one. Cedric can give you an estimate for his motor because he knows all the performance curves, but y...
- Tue Sep 30, 2008 10:36 am
- Forum: General
- Topic: Gigavac contactors
- Replies: 1
- Views: 8912
Gigavac contactors
The commonly used Albright contact are Ok, but they're quite bulky, aren't sealed and have quite high power consumption coils. They used to be rated for 120VDC (with magnetic blow-outs), but are now rated 96VDC. They're actually fine for use at 144 volt or higher, but Albright don't have the equipme...
- Fri Sep 26, 2008 10:02 am
- Forum: Cars,Vans and other road vehicles
- Topic: Lightest car to convert?
- Replies: 30
- Views: 70358
- Thu Sep 11, 2008 3:39 pm
- Forum: Conversions
- Topic: Thoughts/help for a new boy....
- Replies: 14
- Views: 35030
Ideally a simple two speed gearbox would do the job, as few road going EVs need more than two gears, often quite widely spaced. Three gears; reverse is quite useful too! I know it's easy to do electrically, but you get it for free with a standard gearbox and you can remove the unused gears to reduc...
- Thu Sep 11, 2008 1:46 pm
- Forum: All things battery related
- Topic: WHY USE HIGH VOLTAGE DRIVE SYSTEMS
- Replies: 26
- Views: 52477
I'm building an EV with a 660V pack (400V AC motor), and I'm a little worried about what kind of fuse and contactor to use. At upto 800VDC/20A (during regen) the fuse and contactor between batterypack and controller must be high-voltage, spark retarding type. Any ideas? I'm worried about you buildi...