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>> Home > Tags > voltage

battery voltage
huntsman 46 by canabus Admiral   Posted: 15 hours ago
Hi Pilot If you are using 540 can size (35-36mm brushless motor) a 3639-1100kv 800watts, 3648-1450 1600watts or a XK 3674-1900 1769 watts. All run on 100Amp ESCs, but check the maximum voltage they handle. I use car ESCs with the electric fan on top because they run cooler at slow speeds and no water plumbing required. The same with the motors no cooling. Props for these motors 37mm 2 blade or 40-45 mm 2 blade. If you go for a larger motor for a larger prop, a L5055-700kv 1600watts same ESC, but, start with a 2 blade prop about 52mm. Battery a 3-6S 5800mah or more with a C rating of 40 plus. I have used the 35mm motors in 34 to 40" boats, but, for my 46" Vosper Crash Tender I am going to the 5055. To large a prop will cause over heating of the ESC, battery and Motor. A in line amp meter(Hobbyking 9598000004-0) is the one in use. It reads the maximum amps, so for run speed amps slow speed up to maximum as a hit the throttle hard will give you maximum amps. Canabus

46" Firefloat What Motor/Battery by jarvo Fleet Admiral!   Posted: 3 days ago
Hi J. Your motors are nominal voltage 7.2v. Try a single 7.2v 3300 NimH pack, quality from Component Shop. It will be short running time, powering 2 motors but will give you an idea of performance, then you could buy a second, 1 for each motor, if this did not work out or you want more performance then go for brushless motors, still with the 2 battery packs. I would try the single pack first, suck it and see, develop it from there without breaking the bank!!!! Cant see any ESC, have you got 1 or 2? if 1 use a 'Y' lead to connect the second battery. Mark

46" Firefloat What Motor/Battery by canabus Admiral   Posted: 3 days ago
Hi What type of props are you using(size and number of blades). I see your basic problem is under powered motors and a very heavy battery. I made the big switch over three years ago from brush to brushless motors and to Lipo batteries. With the help on the forum and club members it was a learning curve, but, I would not go back. A 5800mah Lipo battery is in the weight of 450 to 570 grams and would give you a good 1/2 hour run time. A good balance charger and safety bag are the main requirements, also maximum charging for the 5800mah battery is 5.8 Amps(same as the old Nicads). Also a low voltage battery alarm. Your 600 motors can draw up to12Amps !!! Replacement same size motors for your mounts would be 35mm brushless motors, but, you will require two ESCs with a Y connector to run on the same throttle channel. Replacement brushless motors are far more powerful e.g. a Hobbyking 3639-1100kv with a 60Amp ESC on a 4S 5800mah Lipo Battery is 800watts and with two in your boat is 1600 watts!!! Your old motor would in the 100 watt each mark !! I have the same size crash tender, but, with a single brushless motor. I have all the order numbers for the motors etc. and a setup the ESCs if your require. Canabus

Voltage step down by Dave M Fleet Admiral!   Posted: 5 days ago
Why not use the 12v battery if the ESC is Ok for 12v. Restrict the tx stick movement so that just 6v goes to the motor

Voltage step down by Novagsi0 Commander   Posted: 5 days ago
Just a thought- The component shop does do a voltage reducer rated at 6 Amps power draw, and will drop from DC (10.5-40v to 1-9v) I thought about using one of these to run a 6v volt Marx Hectoperm motor from a 12v source, to save buying a new battery. As long as your motor speed controller setup doesn't draw more than say 4~4.5 Amps. I'm my case the tug had 4 x 6Ahr 6v batteries wired in parallel giving 16Ahr and 2-1/2 hours running time @full speed. These batteries have since all died due to age. I wanted to use just 1 x 20Ahr 12v battery instead and keep the added ballast I need anyway. This 6 amp unit is on the limit in my application. P.S i'm tight with money and I acquired the battery free from an alarm battery swap.

Voltage step down by jarvo Fleet Admiral!   Posted: 5 days ago
Hi Brian, I would suggest 2 x 6volt NimH cell packs with a parallel 'Y' lead, the reason is you can use each pack to alter the trim of the hull. with a big hull like the Fire Boat, you could even put 4 x 6v cells in for longer duration. a single 12v does not give you a lot of maneuvering room regards balance etc. I have just changed my 48" Fireboat to 3s lipo's from 7.2v NimH packs, this is with Graupner 700bb motors with twin 50mm 3 blade brass props, not tested yet due to poor weather and shift patterns, but it sounds great on the bench. Mark

Voltage step down by misterbee Sub-Lieutenant   Posted: 5 days ago
Battery ordered, and a charger, from Component Shop. Thanks for the guidance. Brian.

Voltage step down by misterbee Sub-Lieutenant   Posted: 5 days ago
Thanks, Dave, That shows how little I know of these things,.....a 12 volt NiMh is obviously the way to go, Thanks a lot. Onward and upward!!

Voltage step down by RNinMunich Fleet Admiral!   Posted: 5 days ago
Agreed Dave👍 A 10 cell NiMH would be my solution, or depending on type of boat; size, weight, performance demands, motor current etc possibly a 12V SLA or 2 x 6V SLA. I use the latter very happily in my 140cm destroyer and 100cm submarine and can tap off 6V for various low current ancillary functions. Will also do the same with my Graf Spee and Belfast refits - provides useful ballast as well 😉 Cheers Doug 😎

Voltage step down by Dave M Fleet Admiral!   Posted: 5 days ago
Hi Brian For your purpose I doubt if you can find a solution that will deliver enough amps for the motor. You can buy 12v NiMh batteries which may be the easiest option if you do not want or require the performance provided by a LiPo which will only give you 11.1v (3s) or 14.8v (4s). If you do decide to change to LiPos I agree with Haverlock and you do need to read and research how to use and care for the battery.

Voltage step down by Haverlock Fleet Admiral!   Posted: 5 days ago
What your asking for is possible but not easy. A 12V ESC will handle an overvoltage but I cannot say how much and depending upon the current draw of your motor a voltage regulator can be expensive. The simple solution is to get a 3s LIPO However you do need a special charger and have to make sure you do not discharge a LIPO to too lower voltage. if your interested in going LIPO have a read about the care and feeding of them.

Voltage step down by misterbee Sub-Lieutenant   Posted: 6 days ago
I know this will sound very basic to experienced members, but my question is; If I want to use an "MTroniks" Viper Marine ESC, which is rated at 12 volts, and a similarly rated brushed motor, how can I easily get 12 volts out of two 7.2 NiMh battery packs? As you can surmise, my electronics expertise is zero. Brian Hill.

PROBOAT RECOIL 17 12.1 VOLT BATTERY by Dave M Fleet Admiral!   Posted: 12 days ago
Hi Les Yes I agree there is no way with the charger supplied you can do anything other than charge to full capacity. I do believe we have made suggestions on another thread on the site advising possible solutions. The cheapest would be to just buy a simple battery checker and make sure after you use the battery the voltage is around the 3.7-3.8v mark. Run a bit more to reduce and short charge to increase. If you are intending to become serious about modelling and using LiPos then, like most of us you will want to buy a charger that does the job for you automatically. There is a cost but if you protect your batteries they will last and save you money in the long term. I've not had much hair for some years so probably that's why!

PROBOAT RECOIL 17 12.1 VOLT BATTERY by Dave M Fleet Admiral!   Posted: 14 days ago
Hi Les It means what it says. Good to see a clearly marked battery for once. You can discharge at up to 20 times the capacity 1300x20= 26000Ma or 26amps It claims you can charge at 3 time capacity 3.9amps. Personally I never charge my Lipos at more than the rated capacity 1.3amps in your case. The battery capacity is 1300Mah has 3 cells (3S) and a nominal voltage of 11.1v (3.7v per cell) Each Lipo should be treated in accordance with its specs. A 2200mah battery may well have a different discharge rate. The dearer batteries usually have higher discharge capabilities. Charging should be done individually and again in accordance with its specs. Not sure why you are asking the final question but if you are thinking of using two batteries together they should have identical specs. Personally I would advise against this as you run the risk of damaging a battery if all the cells are not balanced, not to mention the risks involved both personal and material.

Motor problem by Haverlock Fleet Admiral!   Posted: 14 days ago
before you start ripping out your prop shaft an 850 should be able to use your existing prop. Specifications of 800 and 850 Overall length 110mm (4.3/8’’) - Width (inc. fixing plate) 50mm (2’’) - Weight 585g (20.6OZ) - Voltage 12v DC (reversible by reversing polarity) - RPM for 800 (no load) 5100 & for 850 (no load) 9778 - Current consumption for 800 (no load) 1 amp- maximum efficiency 5.3amps-suggested maximum continuous 7 amps-current consumption stalled 28amps and for the 850 Current consumption 1.9amp (no load) - maximum efficiency 10.8 amps - suggested maximum continuous 13 amps - current consumption stalled 40 amps - Suggested prop size for both motors: 45,50,55 & 62mm in 2 blade nylon or equivalent 3 blade brass