What are Watt Hours/How to calculate how many you need

[@_0O0O0O0_]

Nice. Thanks for using Watt hours to define Watt hours. Really helpful!

[@Rick-uy4kp]

This is great information. I'd heard and read the math before but not how it applied to riding. I got this now. Mine is just a playbike so I can keep up with the doggo. There are DIY battery kits that go together like LEGOs, no welding on the cells. I'll build a couple small, 2 or 3 lb, 52v, 3ah batteries. Build them to the size of an existing non-conductive box or lay up my own. When a battery starts to fail I tear it apart and replace the bad cells. Thanks Johnny. This is where I go when I need a problem solved.

[@FleischerFamilyFun]

Best explanation on this topic. Clear and concise.

[@keefuilow8992]

i am from Malaysia. Thank you. Your explanation is clear and simple to understand to provide a rule of thumb. I plan to upgrade my touring bike soon! Your videos are good. Keep up the good work.

[@JohnnyNerdOut]

Thanks!

[@jonathanjohannis6035]

grat explanation. exactly what i needed to know. 36v 17Ah battery = 612 Whr. thanks man!

[@forevergoddessqueen4404]

Not boring at all. This should be taught in school common knowledge I swear.

[@JohnnyNerdOut]

Thanks!

[@alanjaugust1696]

Short, sweet, and to the point. Good explanation. I intend to build my own 52 volt 20 amp battery using 18650 cells. It will be used on 3000 watt Cyclone mid mount motor. I am building my ebike from scratch. Got my 29er frame set from Bike Nashbar a couple of weeks ago, and I’m starting from there. It was one of your videos, among others, that gave me the inspiration to DIY ebike.

[@JohnnyNerdOut]

So glad to hear! Is it going to be a MTB setup or more road oriented? I'd like todo a frame up build as well, might actually make it easier at a lot of points during the build.

[@gilgerard8097]

r u an engineer?

[@chasinglife43]

This is a great video, straightforward and to the point. I have been having a somewhat difficult time with the start of my solar system build for my greenhouse in figuring all of the calculations. Although not exactly the intended subject, this has been a great help to me. Many thanks fellow awesome nerd!

[@JohnnyNerdOut]

Awesome, thanks!

[@user-zj1cz9fc6u]

How do find out how much Wh/mile does your particular EV use?

[@margieolvida1214]

how many views for 4000 watch hour's

[@captainjayc9217]

How much watts and volts do I need for an e-bike conversion for going uphill? I need to go up a steep hill to go home after fishing in a lake (approximately 30 degree). The ride mostly likely only lasts 5 to 7 minutes long. I don't mind pedaling; I just cannot deal with going up a steep hill. The ride will be exclusively in warm season. Currently I have to walk the whole way (like 20 minutes going uphill on foot), and I don't really like this. I want to see if I can improve the situation and make the trip more enjoyable. I understand that you recommend mid-drive for going uphill over hub. Because I need it for going uphill, regen is not a requirement. What I want to know is watts and volts. Thanks for any info that you can share. I also welcome other people opinion.

[@frakafrocka]

Why is it called a watt hour? What’s the hour for? Thanks for great vid

[@JohnnyNerdOut]

How many watts over an hour. So if my lightbulb was pulling 40 watts and I had it on for an hour, it would pull 40 watt hours.

[@frakafrocka]

@@JohnnyNerdOut thank you

[@TheCriticalChris]

May I ask, at 2:08 how did you arrive at that figure of consumption of 15 watt hours per mile?

[@JohnnyNerdOut]

It’s a rough estimate based off my riding experience

[@beatsentertainment2347]

Was wondering as well. I have 350w brushless rear wheel and running 36v/48v controller. Can i run a 48v 17ah battery? Or 48v 13ah? At the moment I'm using 36v 7ah and i run out of juice as soon i get to work then i have to charge it before I leave my work place to my way home. It's annoying honestly. Thanks in advance

[@JohnnyNerdOut]

If your controller is rated up to 48v then yes you can use a 48v battery 👍

[@beatsentertainment2347]

@@JohnnyNerdOut thanks for the reply 🙏

[@kracksmith4ejm1]

per this vdo is it fair to say a lot of PAS will be 15wh, using throttle with no PAS is 30wh, and full throttle max will be 50-60wh and with hills, add another 10wh to be 70wh ?

[@robertmotion]

Great video. Question...I'm new (self taught) to electrical engineering, repair + maintenance of ebikes. I installed a 4-light system on ebike - backlight, high beam (×1) and low beam (×2). I run everything through a 12v/24v power source (bank). Recently, I decided to add rocker switch (×2) to separate high be from low beam. I noticed that the LED indicators on the rockers will sometimes work, sometimes not but the lights will always work. I've looked for shorts, can't find anything. Power source is rated for 12v/24v. I register 28.5v on multimeter when everything is turned on. Could this be the cause why the rocker lights don't work? I've switched out rockers twice....same result. Hope u can help. Great video. /bklyn 👑

[@budwhite9781]

Outstanding👍

[@carpenterfamily6198]

If a device lists its ( consumption ) Wattage, is that number for one hour ? Trying to determine Watt-Hours so I can be sure I have more than enough power to run a device for an 8 hour work shift. Thanks . . . wish I own one of those Kill-O-Watt gadgets 🙂

[@JohnnyNerdOut]

If it draws 10w, it will draw 10wh (10 watt hours)

[@loamy]

52Volt battery?

[@CoreyW75-ck7tf]

So my question is a watt hour. Im getting a lifepo battery ( 600 watts ) with 298watt hours. Im powering 4 watt cameras . How many hours will my 298 watt hour keep my cameras running before my battery is dead. Thats what Im trying to figure out

[@JohnnyNerdOut]

Divide 298 by 4=74.5. If your battery is 298 watt hours and you are using 4watts for an hour (4wh) you can expect about 74 hours of power

[@CoreyW75-ck7tf]

@@JohnnyNerdOut Hey brother. That is a great help. Thanks for the answer. Keep up the good work.

[@igorshravljevic7784]

If my fridge uses 55w on high and 33w on low.. what solar do i need for it to run all night? Thanks to all answers. Will 100w solar be enough or?

[@JohnnyNerdOut]

It should but those numbers seem really low for a fridge. Get a battery that has double the capacity you need 👍

[@igorshravljevic7784]

@@JohnnyNerdOut thanks bud i appreciate the reply. What do you think if i just go double northstar battery and avoid the whole solar thing would that be over kill or? Thanks again

[@JohnnyNerdOut]

@@igorshravljevic7784 100w solar panel is less than $90. It’s better to have it and not need it

[@igorshravljevic7784]

@@JohnnyNerdOut thanks a lot bud

[@jfjoubertquebec]

Thank you for explaining this as a balance of multiple variables: Telling it like it is. Awesome! So a 750Watt motor will draw more at equal speed than a 500 Watt motor?

[@JohnnyNerdOut]

I wouldn't say that, only if its a much bigger sized motor physically. otherwise it would be the same on paper. The only fifference is that is has the potential to draw more power

[@peacelovegoldenrule]

Found it. Gracias. 🤓

[@ksrnate]

I understand but how do you know how many watt hours your bike needs? So I have a 1600watt scooter, if I'm full throttle all the time how many watts per hour is that going to use??? I understand the rest 👍

[@JohnnyNerdOut]

1600 wh. 1600 (watts) x 1 (hour)= 1600 watt hours

[@ksrnate]

@@JohnnyNerdOut Oh I see 🤣 thanks mate 🤘

[@gilgerard8097]

sell the battery, buy a car.

[@naushadahmad6441]

how many hour are use 9 watt LED Bulbs when connect with 9 Volt battery

[@JohnnyNerdOut]

I don't understand the question.

[@gilgerard8097]

i need to know the current = I...Volts x I (Amps) = Watts. A standard household 9V battery has a capacity of about 500mah. thats 500 milli amp hours. so 9V x .5 Amp-hours = 4.5 Watts, This is the batterys capacity. so 4.5 Watts, is 4.5 Watt-(1) hours. your Led bulb needs 9 Watts from a 4.5 Watt-hour capacity. so half an hour, continuously, Theoretical and Peak, NOT ACTUAL.

[@MrJypsye]

that actually helped a lot thanks

[@highhat5229]

Uhhg I'm lost. So if volts x amps = watts, then 12.6v x 20ah = 252wh?? . So my battery can run 252 watts for 20 hours?? That can't be right can it? Can anyone help?

[@JohnnyNerdOut]

252 watts for one hour

[@JohnnyNerdOut]

Wh is "watts for an hour". So you could 126 watts for 2 hours etc. But that's in a perfect world vacuum type situation. Most likely you'll get a little less.

[@gilgerard8097]

watt-hour is a storage of energy. in a battery. what you do with it , is your business...250 watt-hour storage, can power mathematically 250 watts / 1 hour. 1000 watts/15 minutes, 100W incandescent light bulb / 2.5 hours...peak and theoretical. NOT ACTUALLY. i told the dude with 1600 Watt scooter battery, to sell his battery and buy a car, because that batter is worth $700+

[@RajinderYadav]

He failed to talk about the loss of power due to heat or a aging battery. Always get a lot more power than you will ever need. There is no such thing as wasted capacity when you factor in emergencies and what not. Watt hours is not constant, you will see voltage drop as you ride. So the wattage will also go down as you use more and more of the battery. A simple calculation is not the way to figure out your power needs.

[@blwbisht]

🤙🤘

[@ascend3654]

🤕

[@nicholaspisca4214]

not a great video