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>> Home > Tags > battery voltage

battery voltage
battery life
battery mount
battery pack
battery power
battery voltage
Proximity (Hall effect) sensor wiring by Haverlock Fleet Admiral!   Posted: 10 days ago
I do not know how much knowledge of electronics your friend has but I need to point out that a hall effect sensor is not like a relay. While they do act like a switch ( sort of) they need to be powered and have a hall effect voltage to switch. This would mean in the use intended there would be a current drain on the sensor and if the power supply ( battery?) voltage fell to far it would not function. The effect you want could be replaced by a reed relay cheap and simple to use. However reed relays can only pass low currents so would need to be cascaded with a higher rated relay before switching the main battery supply on and off. these reed relays have both normally open and normally closed contacts and at a couple of quid for 10 worth buying so he can experiment.

fuse holder by teejay Commander   Posted: 18 days ago
Hi all thank you all for advice and comments , I have had a good look at all the suggestion and decided to go for the 3m scotch suitcase type and I will let you know if they are ok. now I have a question for all when choosing motors should you chose a voltage rating equal to the of the battery or higher then the voltage of the battery

HMS BRAVE BORDERER by jbkiwi Commander   Posted: 22 days ago
Rowen, here are a couple of things that may be of use to you (and others). The battery alarm will save you worrying about running out of steam as they can be set to beep at varying voltages to warn you of low battery, just put one on each batt balance lead and when one goes off (when an individual cell drops below the set voltage) it means start heading back. These can be picked up on Ebay for a few dollars. I use them on my planes as well and are audable from around 100m (these twin horns are the best) Secondly, re your ESC switches, these electronic switches (AliExpress) are great for this sort of thing (as long as you have enough aux switches on TX ) You can link them with a Y cable to work together or use them independantly for anything, (lights, pumps etc, - they can be operated by TX rotary switches as well) The ESC and 2000kv motor (HK) are the ones I am using in my ASR model and will work smoothly down to a crawl, the purple 1980 kv seems to have superseded these but I think they will be as good. The props are from Ali Express and are resin and available in L and R hand, are only a few bucks and perform perfectly while looking quite scale(ish). I painted them with an acrylic bronze which seems to have stayed on pretty well. Model weighs 2.8kg and will run at more than 10mph flat out with this set-up (using the 26mm L+R) props) which is silly speed and that's with 2x 2s 2200mah lipos (which will last till you get sick of it and still have 60% left) I was just looking at your Daman set-up and noticed the wiring method from the batts to the ESCs. You might want to make your batt to ESC connections direct to your ESCs (as per original ESC lead length)as your capacitors may get a thrashing (spikes) due to the extra length/ resistance you have there. There is a general rule that you don't lengthen the batt to ESC wiring without adding a 220mf capacitor of same voltage as the ESC for every 4"of extra wire length (ESC to motor - not so much). Might want to check this out in case you fry your ESCs You probably have thought of this but thought I'd mention it, 'just in case' Might help with your modulation as well. Have chucked in a vid of the HSL manouvering (first trials so wasn't perfect) and also the MTB (brushed) which I have just converted to a twin system (was twin but single Electronize unit) plus a sound unit. You may know that you can use as many RECs (bound to the same TX) for various purposes on the same boat (have run 2 boats together from the same TX) Might get you round the mixed brushless/ brushed problem with a bit of thought. Have you thought of changing your old HK silver 6DF TX to twin throttles, it's a piece of cake(as is the TGY 6x), just remove the aileron/rudder centering spring and make a friction plate as per throttle stick, and use the elevator channel as your other throttle. Set your ESCs and you can then use a twin system giving you perfect control. Saves a lot of hassle.

All hooked up, nowt happens... by RNinMunich Fleet Admiral!   Posted: 25 days ago
Hi rapidair65, Most Brushless ESCs seem to assume that you are using either LiPo or NiMh batteries. It needs to know which so it can set the correct cut off voltage per cell, e.g. 3.=V for Lipo. From the applied voltage it can work out how many cells and the correct cut off. If you are using two SLA I assume 2x6V in series giving 12V. So tell the ESC that you are using NiMh and it will assume 10 cells @ 1.2V / cell. I'll be interested to hear how you get on as an SLA has nominally 2V per cell!! You should get away with it as the ESC checks the total voltage applied - it has no access to individual cells 😉 It will probably let the battery voltage go down to 11V before stopping the motor(s)😲 Good luck, Cheers, Doug 😎

All hooked up, nowt happens... by RNinMunich Fleet Admiral!   Posted: 25 days ago
Hi Martin, maybe! Maybe not! You might be lucky. Check the RX with just a servo plugged in somewhere. Then try setting up the ESC according to the instructions I sent. Basically all you have to do is tell it what type of battery you are using. Then it sets the correct 'Cut Off' voltage. BTW: since this is a 'One way only' ESC before you switch the system on make sure the throttle stick is pulled right back. Otherwise the motor will start up straight away. Mind yer fingas!! 😡 Also check that the throttle channel is not reversed at the TX - like most Futaba sets for some crazy reason - or again the motor will start up with the throttle pulled back. PDF: as Steve says; click on the Icon, then on [Download] in the top left corner. Windows should then offer you the choice of 'Open' or 'Save'. Click 'Save' and Windows will ask where you want to put the file. Cheers, Doug 😎

All hooked up, nowt happens... by RNinMunich Fleet Admiral!   Posted: 26 days ago
Hi Martin, Looks like this one XXD HW30A 30A Brushless Motor ESC For Airplane Quadcopter Which means it ain't got no backuds! But I don't suppose that bothers you. Attached is the manual as pdf. Before you can run the ESC you have to program the type of battery; LiPo or NiMH. The ESC then sets the correct cut off voltage to protect the battery from deep discharge. See second page of pdf file for instructions. The ESC has a 5V 2A BEC. If you use a separate RX battery you MUST disconnect the small red wire from the RX plug! Bon chance, Cheers, Doug 😎

RC....mixers? And other unknowns.. by BW3 Chief Petty Officer   Posted: 2 months ago
Ok... Currently trying to build a Itaieri Schnellboot, ...but am questioning if what little I think I know to be correct/ workable... I have amassed the following : 3- Hobbyking ST3007 1100KV brushless motors each direct drive to 32mm plastic props.... (2 right hand drive and 1 left hand drive props... swapped over leads on on motor to get it to run as yet untested the left hand prop) 3- Turnigy nano tech 3s 3000mh 25-50C Lipo ( Have got a balance charger and board , flame proof charge bag , battery voltage check/ alarm units, and will check and charge them await the only local help I have in RC / lips battery a helicopter flyer who has no experience with RC boats ) I just read the post on WTail mixer and wonder if I need that or if my current unkowning idea to just connect all 3 ESC ‘s together to one channel on the radio , again was give Eflite Blade SR HP6DSM 2.4GHz to try out ,Will this unit work or do I need something else , currently will/ can use all 6 channels but would / could use more if I had them ... last time I had anything to do with RC was a a kid/ teen and back then you had ground radios and flight radios and the two should not be mixed .. Ok please advise , how far off am I or am I still within range of keeping it simple ? Thanks All Bill

Voltage increasing via regulator by RNinMunich Fleet Admiral!   Posted: 2 months ago
A somewhat confused question if I may say so Eric!😲 You can't 'regulate up' only down. The regulator's job is to produce a constant lower voltage from a range of higher voltages. I often use one to produce 5V for the RX and servos from a 12V SLA drive battery. A little 3 legged device (type LM7805) which looks just like the power FETs in a high current ESC. My version of a UBEC! 😉 What is this 'regulator' you have? Type number? Manufacturer? Photo? To get 12V from 7.2V you would need to use a Voltage converter (also known as an inverter). This works by converting the DC input from the battery to an AC voltage which can then be increased using a transformer. More elegant (and expensive!) versions use a transistor oscillator and amplifier. This uses hi-power transistors instead of the transformer. The AC output of the transformer (or amplifier) is then rectified back to DC. All this is very inefficient which is why it is normally only used for very light currents, where the losses are not so significant, and when there is no other alternative, not often the case! You can't beat the physics and you will never get the same power out that you put in. This leads to a basic design question:- What is the total current consumption of the load? I.e. the motors. A simple example:- Let's say that at 7.2V the motors draw 10Amps total, i.e. 72W (or VAmps). Assuming a utopian 100% efficiency at 12V this would equate to 6A. Due to the three stages of conversion; DC to AC, transformation / amplification of AC to 12V, AC back to DC, you'll probably be lucky to get an efficiency of around 60% to 70%. Thus if you stick 720W in you'll get around 430 to 504W out. Not much of a gain is it!🤔 Your battery would be exhausted in about 2/3 the time it is now 😡 If your motors draw more than 10A the problem just gets worse. So what is it you really want to do? If you just want to up the volts to your motors stick a 12V SLA or an 11.1V LiPo (3S) in and hope that you don't cook your motors! Frankly I don't really know why you're bothering, tugs aren't sprinters! If you want more pulling power with the existing setup try experimenting with prop sizes and pitch. Will probably achieve much more than fiddlin' about with voltage converters. BTW: All this assumes that the RX has it's own separate 5V battery supply or from a BEC in the ESC. Some clarification needed from your side. Cheers, Doug 😎

Mtronics and Lipo's by ads90 Commander   Posted: 2 months ago
The TIO has a safety low battery voltage cut-off for LIPO batteries whereas the Viper 15 does not have this facility. If you are confident in not running down your LIPO battery to below a 'safe limit' then you should be OK to just use the ordinary Viper.

motor sizeing by canabus Fleet Admiral!   Posted: 3 months ago
Hi Jim I used a Hobbyking D3548/4 1100kv , a car ESC (hk60A-SL)(electric fan on top for cooling), program card(HK PROG-CARD) and a 40mm 2blade prop(test out the one on the boat first). Battery a 3s 5800mah 30C Lipo. This is in my Sea Commander and gives a good turn of speed with a long run time. ESC set up:- 1 Cutoff Voltage for 3S=10.2 and 4S=13.6 2 Start Power Percent=5% 3 Advance Timing=4 4 Run Mode=2 5 Brake Force=1 6 Drag Brake Force=1 7 Neutral Range=1 8 Initial Brake Force=1 9 Reverse Force=1 Canabus

1.5v AA Li-Fe/Li-ion/Li-po batteries by RNinMunich Fleet Admiral!   Posted: 4 months ago
OK, found some! Interesting that they all quote mWh instead of mAh! I.e. energy instead of capacity! Power being V x I (Amps) divide the mWh rating by the nominal voltage to get an approximation of the capacity in mAh. Saves integrating across the varying voltage during a discharge cycle, i.e.'On Load' 😉 Thus these 3000mWh cells seem to have a capacity of around 1800mAh. Which is considerably less than the typical 2500mAh of an alkaline or NiMh AA cell. Also, to produce the output voltage of 1.5V from 3.7V Lithium chemistry the cells have an internal voltage regulator, which also must consume some power, albeit miniscule. Something else which can go wrong🤔 Summary; yer pays yer money and takes yer choice! Seem rather expensive to me for what they deliver. Depends what you want to use them for. Might be useful in my Sony camera but I wouldn't use them for any high current load in a model. OK perhaps for LED lighting circuits which only need a few tens of mA. Here a list of battery types, sizes and chemistries for reference. Cheers, Doug 😎

Mahogany in Scale by RNinMunich Fleet Admiral!   Posted: 4 months ago
Neither can I Martin! "The transmitter used two vacuum tubes wired as a multi-vibrator with a tank circuit to constrain emissions to somewhere near the 27 M/cs band (same as MHz, but that name came later). With not a crystal in sight, transmitter frequency drift and battery voltage drain was a problem, so careful tuning just prior to short flights was the order of the day." Cheers, Doug 😎

Graupner Jumbo 540 motors by Will-I-Am Sub-Lieutenant   Posted: 4 months ago
Doug, The 6volt battery is currently an NiMh battery not an SLA. The problem was that according to Mtroniks the minimum voltage to the ESC to adequately run the BEC connection is 6volts. That is why I was getting erratic control when the battery voltage was 5.6 volts. The action speed controller will work 2-12 volts and I am going to use a separate receiver battery as suggested by Dave Milbourn just to make sure. Regards Will

Graupner Jumbo 540 motors by CB90 Fleet Admiral!   Posted: 4 months ago
I think it would be worth the risk of running the DC Motors at 7.2v (NiMh) or second choise 7.4v (Lipo) and get rid of the 6v lead acid battery. The chance of damaging the motor is limited, the battery packs will be lighter than an equivalent lead acid, but will need to by a charger as well. Always put a fuse in line rated 5 amps below that of the ESC. Or buy two higher voltage motor? only £6.99 each plus P&P link copy and paste into browser address:-

Cheap motor for a quick fit, but what prop gents?... by RNinMunich Fleet Admiral!   Posted: 4 months ago
Mornin' (😲) Martin., First off; the Hornet ain't mine, wish it was 🤔 I had a look on the Lesro Models site to get an idea of what the prop would have to shove! Was surprised to see it is my hull with a different lid! The current kit is 80 quid BTW. To the motor / ESC; Yeah, you could use an 11.1V LiPo on that motor. BUT your ESCs probably are not LiPo SAFE! Which means that they won't have an automatic shut off or slow down function for when the battery is getting near it's Suicide voltage; roughly anything below 3.0V. Some say 2.7 but I don't risk that. So you would have to be cautious on the first runs and frequently check the remaining volts to learn how long you can run before you risk damaging the LiPo. If you can squash it in how about a 12V 10 cell NiMh? That should give you a good turn of speed with the 35mil prop. Bit heavy though🤔 I use an 11.1V LiPo in my Sea Scout with a 1000kV brushless. i.e. ca 11.100 rpm full bore, and that lifts her snout quite well as you have seen. Hope you find the motor, you seem to make a habit of 'mislaying' motors! Have you found the Supermarine yet? Apropos Supermarine; I've just been asked to renovate one 😉 Looking forward to that so I can see it's coil construction first hand. Will help me refine the mod instructions for you.😉 ESCs; mail me any printing on them and photos and maybe I can identify them and their capabilities. The switch makes me think maybe they do have BEC! The leads don't go nowhere cos it's only there to switch on the ESC / BEC. In my experience only ESCs with BEC have such a switch. Easy way to find out; set up an RX with a servo, plug the ESC lead into the RX, stick a battery on the ESC WITHOUT motor, switch on the TX and the ESC (move the switch to the end where two wires are connected) and see if the servo responds to the TX or any LEDs flash on the RX. Or just measure the volts across the red and black wires on the RX plug! If the ESC has a heat sink I don't think you need worry too much about current capability. Use your natty new Wattmeter to measure the current drawn by the motor as you run it slowly up to full speed. 😉 Don't think you need worry about volts either; all but the teeny weeny ones (like the fingernail size 3.7V ESCs I just bought for my Plastic Magic ships with only a 1S LiPo supply) can normally handle at least 12V, it's current that usually kills 'em😡 Sorry; Your electro-boards are still here, haven't been too mobile lately🤔 So I ordered some prepaid DHL labels (arriving Thursday) and will then get them to collect your parcel from me. Will email when they're finally underway. Cheers, Doug 😎