# Search results

1. ### Current Limiting

I have an odd application. I Need to be able to hook my motorcycles to my truck to charge the battery an warm them up I ride them in super cold (-35*F) and need to find way to hook the truck to the bikes but only limit the current to 10 Amps to each bike. They both have LIFEPO4 Batteries. The...
2. ### Power on a slope

Im trying to figure out how much power is needed to maintain a vehicles speed on a slope I found out that my car weighing in at about 2000 lbs needs 15hp to maintain 75 mph on a flat road with no wind. now I'm trying to figure out how to take that and calculate the power needed on a 10% grade...
3. ### Effects of propylene glycol on heat transfer efficiency

Thanks! I tried googling but was not using the right words!
4. ### Effects of propylene glycol on heat transfer efficiency

I'm trying to calculate the heat loss of efficiency due to increasing the mixture of propylene glycol in a heat transfer fluid compared to water.. For this I'm saying that water has a heat transfer efficiency of 100% (relative only) Im looking for multiple data points to create an equation...
5. ### Heating & Cooling of Water

I thought it was a thermo problem. Its not a HW type problem if that what your thinking, I own a company that sells solar products (PV & Thermal) and of all the pros and books out there i can't find much on this topic. I wanted to develop a program that would be able to calculate how much hot...
6. ### Heating & Cooling of Water

Ok so my question is about hot water in a home Lets say that I take a shower a shower and i use 20 gallons of water at 105* F If the hot water in my tank is at 140*F and my cold water comes in at 50*F how much of hot (140*F) water did i use? How much cold (50*F) Water did i use? Now...
7. ### CVT transmission for an electric motor

Im wondering why you are using a DC motor and not an AC motor with a VFD/Inverter? I am correct on the use of a DC motor right (the ON/OFF remark)
8. ### Accleration Speed & Time

Yeah i know acceleration won't be constant but tq will remain constant thanks to nifty little devices called VFDs. like you said I am just after the general numbers not the exact one. thanks for you help!
9. ### Accleration Speed & Time

Now how does this work if i start at say 25 mph and want to go to 75 mph with all the same numbers
10. ### Accleration Speed & Time

thanks! actually I'm working on designing a EV truck with 6 150hp AC motors one on each wheel so making enough tq for 15 seconds is not a problem... my problem is building a battery pack, Super Cap pack and generator to power it all.
11. ### Accleration Speed & Time

could you break that down for me. what is dp and dt? and I'm thinking f is force? I can find the G Force exerted on the car i just don't know how to turn that into time to a given speed here is what i have so far Givens: Weight: 5000 lbs Wheel Radius - 10 in Tq @ Wheel 3000 ft-lbs Calculated...
12. ### Accleration Speed & Time

Ok so here's what I'm trying to figure out: Given a required time i need to figure out how much wheel thrust is required to accelerate a car or truck to a given speed. (ie take a 5000 lb car to 75 mph in 15 seconds...) I've been searching but can't find a good formula to use. please help