Search found 219 matches

by Renard
Sun, 17 Jul 2011, 18:43
Forum: Batteries, charging, management and monitoring
Topic: What paste?
Replies: 12
Views: 2834

What paste?

There is also 'Uni-seal' made by Electropar available from Hayman's Electrical.
by Renard
Thu, 23 Jun 2011, 04:45
Forum: EV Motoring
Topic: Solid Articles on EV Environmental Myths
Replies: 2
Views: 945

Solid Articles on EV Environmental Myths

If you read the report at lowcvp.org.uk, you will see that the article in the Australian woody has referred to, seriously misrepresents the Report. (Who's surprised that a Murdoch paper should do such a thing!) The Report is mainly concerned with broadening the life-cycle analysis of emissions. It a...
by Renard
Thu, 12 May 2011, 04:35
Forum: Technical and conversion discussion
Topic: NCOP 14 # 2.9 Chassis leakage
Replies: 12
Views: 2697

NCOP 14 # 2.9 Chassis leakage

Cometboy,

My point was that current can't just flow to the chassis and stop there like a puddle; it has to flow from +ve to -ve.
Just it goes via the chassis. That is, there must be leakage from +ve to chassis and also from -ve to chassis.
by Renard
Wed, 11 May 2011, 22:52
Forum: Technical and conversion discussion
Topic: NCOP 14 # 2.9 Chassis leakage
Replies: 12
Views: 2697

NCOP 14 # 2.9 Chassis leakage

I see from the new NCOP 14 in paragraph 2.9 that there should be "less than 20mA" leakage current from HAZV to "chassis or ELV components". This current must be flowing between the +ve and -ve of the main battery terminals-- presumably via the chassis which must then have a definite potential with r...
by Renard
Fri, 07 Jan 2011, 16:37
Forum: Technical and conversion discussion
Topic: Poor Man's Regen. air con.
Replies: 20
Views: 2835

Poor Man's Regen. air con.

I know this is slightly off-topic, but on the subject of heating, I wonder if anyone has effected or even considered using the waste heat from water-cooled controllers (Wavesculptor) which would be about 500W for 10KW output and 95% controller efficiency (from Tritium's graph in the Datasheet) to pa...
by Renard
Thu, 02 Dec 2010, 21:59
Forum: Technical and conversion discussion
Topic: Idle power
Replies: 19
Views: 2228

Idle power

Evric, I also have a Mean Well SCN 800 (Watt) DC-DC converter which I bought for $35 from Oatley Electronics. An applied voltage between 0 and 5v sets the output voltage, which I have adjusted to 13.8. Curiously, a computer memory back up Li battery of 3.7V gives just the right output. I hadn't deci...
by Renard
Tue, 30 Nov 2010, 14:33
Forum: Technical and conversion discussion
Topic: Idle power
Replies: 19
Views: 2228

Idle power

I am interested to learn how people have set up these control systems. Evric, you say you don't need the DC-DC converter other than during main pack charge, due to its capacity of 33Ahr. But why store extra energy in a heavy lead-acid battery when the storage in the lighter Lithium pack is more weig...
by Renard
Mon, 29 Nov 2010, 22:55
Forum: Technical and conversion discussion
Topic: Idle power
Replies: 19
Views: 2228

Idle power

If the "ignition" switch has two positions, one for the DC-DC converter via a small contactor, and the second position for the main contactor driving the controller, and if no auxilliary loads are on, then the current draw would be just for that small contactor plus the charging current into the aux...
by Renard
Fri, 26 Nov 2010, 17:13
Forum: Members Machines
Topic: Obsolete Thread
Replies: 576
Views: 93069

EV2Go's - Lithium Powered Trike

Yes, 10A equipment will work, but not for ever. Make sure the plug/socket mating is clean and firm. It should give you a few years.
by Renard
Fri, 26 Nov 2010, 17:07
Forum: Technical and conversion discussion
Topic: Electric heater
Replies: 16
Views: 4447

Electric heater

Why not just use a FET, suitably rated for say 200V, with probably less than half an ohm ON resistance. At low currents that gives you a negligible power loss. Drive the FET gate from the 12V supply.
by Renard
Fri, 26 Nov 2010, 16:40
Forum: Members Machines
Topic: Obsolete Thread
Replies: 576
Views: 93069

EV2Go's - Lithium Powered Trike

In my experience, fixing various appliances, pulling 10A from a 10A outlet with a 10A plug leads to burnout eventually. Better to use a 15A plug and socket for currents near 10A.
by Renard
Tue, 23 Nov 2010, 20:58
Forum: Members Machines
Topic: Obsolete Thread
Replies: 576
Views: 93069

EV2Go's - Lithium Powered Trike

Thanks for taking trouble over the photos. That's a whole lot of gear: buses, cables, units etc, and a current sense loop I see also.
by Renard
Tue, 16 Nov 2010, 01:41
Forum: The Lounge
Topic: Customer Service
Replies: 9
Views: 1884

Customer Service

I was planning on 108 or 112 cells, so that would require seven DCM units.
And without actually getting a quote yet, it seems as though the price would be about the same as the small individual cell modules you refer to, but with a display as well, as you say.
by Renard
Mon, 15 Nov 2010, 22:05
Forum: The Lounge
Topic: Customer Service
Replies: 9
Views: 1884

Customer Service

Well, whatever you can do.
Actually no IGBTs in a control device I shouldn't think; more a question of software and a communication bus.
It looked like a sophisticated star-type BMS system with lots of data reporting. Price?
by Renard
Mon, 15 Nov 2010, 17:11
Forum: The Lounge
Topic: Customer Service
Replies: 9
Views: 1884

Customer Service

I look forward to the possibility that you will both report your experience with this BMS system.
by Renard
Mon, 13 Sep 2010, 19:30
Forum: Technical and conversion discussion
Topic: Radios, EVs and bad electrical interferenc
Replies: 25
Views: 3403

Radios, EVs and bad electrical interferenc

Correct me if I'm wrong, but isn't EMC less serious on the DC bus due to the controller's front end capacitance? Should one then attend to the controller to motor cables, say, by arranging them in trefoil configuration and putting them in a flexible metallic conduit, while the DC bus cabling could b...
by Renard
Sat, 11 Sep 2010, 14:55
Forum: Technical and conversion discussion
Topic: Radios, EVs and bad electrical interferenc
Replies: 25
Views: 3403

Radios, EVs and bad electrical interferenc

Many thanks acmotor. I had been wondering. I notice that Tritium's WaveSculptor docs had not mentioned shielding, hence the question.
by Renard
Sat, 11 Sep 2010, 03:11
Forum: Technical and conversion discussion
Topic: Radios, EVs and bad electrical interferenc
Replies: 25
Views: 3403

Radios, EVs and bad electrical interferenc

On the topic of radio interference, is it necessary in an AC installation to shield the cables running from controller to motor?
by Renard
Wed, 08 Sep 2010, 02:49
Forum: Electric motors and controllers
Topic: AC motors, amping it up. :P
Replies: 58
Views: 9154

AC motors, amping it up. :P

If I can get this clear with the assistance of the AC wizards: Given that power increases only as long as V increases with f, the maximum line-line voltage of the Wavesculptor at 320V determines a frequency above which higher frequencies offer no more power, just more speed and less torque. So a mot...