Search found 328 matches

by Gerhard Michel
Sat Jan 02, 2021 10:57 pm
Forum: Knowledge Base
Topic: Replacing the power on relais with a battery shut off
Replies: 17
Views: 652

Re: Replacing the power on relais with a battery shut off

Hi Roy, lead acid batteries unfortunately have no fix correlation between voltage and remaining capacity, because the voltage is also dependent from load current. Maybe a battery shows 24 volts and ist nearly empty, when measured without current, and another battery has 20 volts and half its capacit...
by Gerhard Michel
Sat Jan 02, 2021 4:58 pm
Forum: Knowledge Base
Topic: Replacing the power on relais with a battery shut off
Replies: 17
Views: 652

Re: Replacing the power on relais with a battery shut off

Well, also a warning given by a normal relay may be too late even when using simple lead acid batteries. When using LiFe cells this would be absolutely no practicable possibility. A BMS however would cause a final stop of the tank. IMHO a reliable monitoring of the battery state is the best solution...
by Gerhard Michel
Fri Jan 01, 2021 12:06 pm
Forum: Knowledge Base
Topic: Replacing the power on relais with a battery shut off
Replies: 17
Views: 652

Re: Replacing the power on relais with a battery shut off

Hi Roy, I bought these components years ago from a military surplus dealer; mine come from cannibalized tanks (full scale). :mrgreen: But also other dealers (e.g. EBAY) offer such components in new state. Here 2 pics of a switching fuse and a bistable relay. The dual fuse has only 2 x 7 amps nominal...
by Gerhard Michel
Fri Jan 01, 2021 12:38 am
Forum: Knowledge Base
Topic: Replacing the power on relais with a battery shut off
Replies: 17
Views: 652

Re: Replacing the power on relais with a battery shut off

In my 5 tanks I use an automatic circuit breaker as a main switch; from 30 to 60 amps nominal current, depending on tank model. These circuit breakers trip out at 150 % of the nominal current within about 10 seconds. This allows to consume up to 90 amps peak for this 10 seconds. IMHO most wiring of ...
by Gerhard Michel
Wed Dec 30, 2020 10:32 pm
Forum: Craftsman's Market
Topic: RC Light Switches
Replies: 9
Views: 564

Re: RC Light Switches

Beier in Germany (the sound module manufacturer) offers a 4 channel RC switch with 15 modes. Could this be an option ? Here the description: https://www.beier-electronic.de/modellbau/produkte/rc-sm-4/rc-sm-4.php?sprache=gb If you like to control the loads with the sound module outputs there is anoth...
by Gerhard Michel
Mon Dec 14, 2020 10:40 pm
Forum: General Electronics Topics
Topic: Lifepo4 Battery
Replies: 8
Views: 1194

Re: Lifepo4 Battery

Hello Christoffer, fortunately a 300 W sound system doesn't consume 300 W at any times; this is the peak current (e.g. gunfire). But yes, my 250 W sound system needs up to 3 amps, when the tank stays with motor idle. This is an average value because the volume is variable, controlled by transmitters...
by Gerhard Michel
Sun Dec 13, 2020 10:40 pm
Forum: General Electronics Topics
Topic: Lifepo4 Battery
Replies: 8
Views: 1194

Re: Lifepo4 Battery

Hi Stephen, of course a BMS is a good thing to protect a LiFe battery, but I refuse to say it is the only one. Like you I think that your BMS switched off due to an 'excessive' current peak, but that limitation results exclusively in the electric data of the BMS and not in any damage which may happe...
by Gerhard Michel
Sun Dec 13, 2020 11:04 am
Forum: General Electronics Topics
Topic: Lifepo4 Battery
Replies: 8
Views: 1194

Re: Lifepo4 Battery

Hi Allan, I use each 8 LiFe cells (26 V) of 36 Ah in my Jagdtiger, 40 Ah in my King Tiger with Porsche turret, 20 Ah in my King Tiger with Henschel turret and other 20 Ah in my Pz. IV. Please note that these batteries are the only power sources in my tanks, for driving, sound (up to 250 watts), RC a...
by Gerhard Michel
Sat Dec 12, 2020 1:06 pm
Forum: Jagdtiger
Topic: JT in Germany
Replies: 98
Views: 12969

Re: JT in Germany

Hi Brian,

I'm not a friend of LiPos for tank models, because these types of batteries may burn, if they are not treated well. LiFes are much more safe in daily use.
by Gerhard Michel
Fri Dec 11, 2020 10:54 pm
Forum: Jagdtiger
Topic: JT in Germany
Replies: 98
Views: 12969

Re: JT in Germany

Hello Peter, glad to read that at the end you also have decided to use LiFes! In my opinion this is the only one power source that fits a modern vehicle; small, lightweight, powerful. :mrgreen: Due to the fact that a LiFe battery can be used at 100 % DoD without a significant lack of duty and a lead...
by Gerhard Michel
Fri Nov 13, 2020 10:50 pm
Forum: Craftsman's Market
Topic: Rotisserie to Make Life Easier
Replies: 8
Views: 3564

Re: Rotisserie to Make Life Easier

Nice design, indeed! For my tanks I use customary hydraulic car jacks with a simple plywood plate for working and for storage with released drive train springs. These jacks are a little too high to drive over; therefore I move the tank upon 2 wooden beams with the jack between. Then I jack the tank ...
by Gerhard Michel
Fri Nov 06, 2020 10:39 pm
Forum: Chieftain MBT
Topic: Totem Pole and the Sundance kid
Replies: 26
Views: 3433

Re: Totem Pole and the Sundance kid

Hi John,

thanks for reply. In better times the nameplates were some more informative........... :roll:
by Gerhard Michel
Wed Nov 04, 2020 2:36 pm
Forum: Chieftain MBT
Topic: Totem Pole and the Sundance kid
Replies: 26
Views: 3433

Re: Totem Pole and the Sundance kid

Hi John,

well, I hoped to see a simple nameplate like it is on the older motors:

Image
by Gerhard Michel
Sun Oct 25, 2020 1:33 pm
Forum: Chieftain MBT
Topic: Totem Pole and the Sundance kid
Replies: 26
Views: 3433

Re: Totem Pole and the Sundance kid

Btw just a question: may anyone please tell me the nominal current consumption of the latest Spiradrive motors (nameplate)? Are there different Spiradrive motors (means electrical data, like power consumption) in use between heavy and light Armortek models or only different transmissions?
by Gerhard Michel
Sun Oct 18, 2020 11:59 am
Forum: Chieftain MBT
Topic: Best batteries to use for chieftain
Replies: 39
Views: 2075

Re: Best batteries to use for chieftain

Does anyone have any measurement data wrt current draw of the motors on any model? Hi Richard, all my models have -among other shown values on my transmitter- a real time current measurement via telemetry (the other transmitted data are e.g. voltages of each LiFe cell, temps of motors and ESC and -...