E-bike charging

[norfolkexplorers]

We have converted two bikes into 250w mid drive e-bikes, road legal. The batteries are 48v and draw 4 amps. They charge via 3pin uk 13amp plugs. We own a Jackery 1000w battery unit.

Can I charge the batteries from the Jackery?

Thank you

 

[pappajohn]

It will depend on the input watts of the bike charger and the average charge time..
The jackery only has a capacity of 1002watts

 

[steven2002]

Really need to know the capacity of the battery.

 

[Lenny HB]

Should be OK your charger is unlikely to take more than 1.5 amps, a 1000 watts is approx 4 amps.

The charger should have a label on it giving the ac rating.

 

[norfolkexplorers]

Thank you I’ll take a look.

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[autorouter]

Also you'll need to know the capacity of the bike batteries, probably 350Wh to 600Wh. The capacity of the Jackery battery is I think 1002Wh, so it has enough energy for two 350Wh batteries, but not enough for two 600Wh batteries. So that's why you need to know the bike battery capacity in watt-hours.

Also, as others have said, you need to know the watts each bike charger requires during charging. However I'm sure it won't be a problem, it's almost certainly going to be less than 1000W total - probably nearer 500W if anything. If the watts isn't on the label you can work it out from the output volts and amps. For example 3A at 50V means the watts is 3 x 50 = 150W.

 

[Petroleumblownapart]

We have converted two bikes into 250w mid drive e-bikes, road legal. The batteries are 48v and draw 4 amps. They charge via 3pin uk 13amp plugs. We own a Jackery 1000w battery unit.

Can I charge the batteries from the Jackery?

Thank you

 

[Petroleumblownapart]

Yes but not for long?

 

[Coolcats]

The advi

We have converted two bikes into 250w mid drive e-bikes, road legal. The batteries are 48v and draw 4 amps. They charge via 3pin uk 13amp plugs. We own a Jackery 1000w battery unit.

Can I charge the batteries from the Jackery?

Thank you

The advice from the fire service is always use the battery manufacturers charger

E-bikes: 40% of fires from conversion kits - brigade says

Cheap and badly built kits are leading to the "fastest growing fire trend", the fire service says.

www.bbc.co.uk

Fire investigators issue urgent warning over fires involving e-bike batteries

A man who escaped a blaze at his flat has backed fire investigators in issuing an urgent warning following a spike in “ferocious” fires caused by electric bike and scooter batteries.

www.london-fire.gov.uk

 

[autorouter]

The advice from the fire service is always use the battery manufacturers charger

Totally agree with that, but I am assuming the OP is using the battery manufacturer's (mains) charger, plugged into the Jackery mains inverter output. That should be just as safe as using a standard domestic mains socket.

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[Coolcats]

Totally agree with that, but I am assuming the OP is using the battery manufacturer's (mains) charger, plugged into the Jackery mains inverter output. That should be just as safe as using a standard domestic mains socket.

let’s hope so

 

[two]

How will you charge the Jackery?
You don't mention the capacity of your e-bike batteries (Wh).
If the Jackery is 'full' you could assume up to 90% of its rated capacity (1000Wh?) is available. There will be some inefficiencies, so allow for that too.
If the e-bike batteries are 500 Wh or more each, you could only charge one without topping up the Jackery, unless they only need a partial re-charge. So, in simple terms, the Jackery will recharge e-bike batteries but (like jugs of water, you won't get a quart out of a pint pot) you need to look at the capacity of each. If you have 900 Wh of useable capacity in your power bank, you could transfer that amount into e-bike batteries before needing to recharge the power bank. So how do you intend to do that? If by connecting to mains, I suggest you charge the e-bike batteries directly as well.
1000Wh = 1kWh = a modest amount of power. E-bikes can consume that quite quickly if you cycle aggressively.

 

[LaughingPlumber]

Don’t confuse W with Wh. The charger’s requirement would appear to be 4 amps x 240 v = 480w. That’s the power input from the inverter.
The battery output is the amount of power it contains, 900Wh, ie the size of the fuel tank. That affects the length of time the battery will take to reach its realistic full charge. If the battery is fully discharged charged, and the charger is not regulated in some way, which is unlikely if it the manufacturer’s original, then the charging time would notionally be under 5 hours not allowing for heat generated during the process.
If the motor is road legal it’s only pulling 250 watts maximum.
Realistically my Bosch 500Wh batteries used to take around 5 hours, but I think the charger was modulated, and only pulled a maximum of 3.5w for the first 50% or so of the charge.
Finally, the output of inverters is normally quoted at peak power output. Continuous output is normally 50%, so probably best to only charge one battery at a time.

 

[Clive Mott]

Most standard Ebike chargers charge at 2 Amps. Say on charge your 48v battery will be 50 volts (to keep the maths easy) then that is 100 watts going into the battery, say 110 watts out of the mains. If your battery is 10AH then that is 5 hours of charging. 5 hours at 110 watts is 550 watt hours, or half the Jackery. Does that help?

 

[Chossy]

Yes absolutely, I have the same jackery and did a test charge when I received my new ebike the other day, it is a 750w battery and it worked perfectly using the supplied charger with the inverter setting enabled on the jackery unit. It was a big draw and only left me with 10% at the end but it was charging a 750w battery from 0-100 using the built in inverter. So this absolutely works perfectly.

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[autorouter]

Yes absolutely, I have the same jackery and did a test charge when I received my new ebike the other day, it is a 750w battery and it worked perfectly using the supplied charger with the inverter setting enabled on the jackery unit. It was a big draw and only left me with 10% at the end but it was charging a 750w battery from 0-100 using the built in inverter. So this absolutely works perfectly.

Great , it's very useful to know the Jackery power pack works fine with an ebike battery charger. I think people might get confused with watt-hours (total battery energy capacity) and watts (how fast the energy is used), so can you check the spec/label on the battery to see if it's 750Wh (not 750W)?

 

[VXman]

Also, as others have said, you need to know the watts each bike charger requires during charging. However I'm sure it won't be a problem, it's almost certainly going to be less than 1000W total - probably nearer 500W if anything. If the watts isn't on the label you can work it out from the output volts and amps. For example 3A at 50V means the watts is 3 x 50 = 150W.

I was just monitoring charging my bike battery this afternoon when charging it at home. Smart meter suggested 75 watts. Charger says 2 amp/36 volt so pretty much spot on.

 

[Chossy]

720wh

 

[autorouter]

Also you'll need to know the capacity of the bike batteries, probably 350Wh to 600Wh. The capacity of the Jackery battery is I think 1002Wh, so it has enough energy for two 350Wh batteries, but not enough for two 600Wh batteries. So that's why you need to know the bike battery capacity in watt-hours.

If the Jackery 1000 hasn't got enough battery capacity to fill two bike batteries, then you could add a second battery to the power pack to increase its storage capacity. Extra batteries have a capacity of 1264Wh each, and apparently you can add up to three extra batteries. The 1000W inverter in the Jackery should be able to cope with the bike batteries easily. For comparison, a 1264Wh battery is equivalent to a 105Ah 12V leisure battery (ie 1264Wh/12V = 105Ah)

 

[two]

Alternatively, you could buy a spare e-bike battery and charge that.

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[VXman]

Inverter attached to leisure batteries and charge while driving is what I do - plus solar.

 

[jumar]

Inverter attached to leisure batteries and charge while driving is what I do - plus solar.

The first most efficient way of charging an eBike....the second would be Solar...but somewhat longer....therefore less efficient...
Here in Spain it's ride, rest, then charge in the afternoon sun...just like I'm doing now...ready for tomorrow's ride...then repeat....

 

[Chrisvh]

A Rolls Royce solution for 12v charging, on the move, is a PowerButler. German made and unfortunately not available for delivery in the UK. Easily sourced in Germany or elsewhere in Europe.

Einfach unterwegs E-Bikes aufladen

Powerbutler ist das mobile E-Bike 12V-Ladegerät für Auto, Wohnmobil, Caravan und Boot

powerbutler.de

Not cheap. But very efficient, and flexible if charging different brands of batteries