ebike 48V charger power requirements for inverter

[OllieGBR]

Hello all.

Next on my electrics list after completing the rebuild over the weekend is sizing an inverter for the Ribble eBike I have purchased for my wife
The charger draws 2Amps at 240v, reducing this to 42v and therefore I think delivering much higher Amps.

To size an inverter, I assume I only need to take into consideration the 240v draw. At 2Amps this is 480W.

So an 500W inverter should be capable of delivering enough power? I'm looking at the Victron Pure Sine Wave that has a peak power of 900W - I assume this is for inrush current?

Thanks
Ollie

 

[Deaky]

I think as a rule of thumb you should be looking at between 20-50% more than your load

 

[OllieGBR]

Can anyone recommend a particular inverter? I'm going to stick with Victron otherwise?

 

[t0mb0]

I assume you’ve looked for an actual 12v supply charger that would do it? Would be more efficient than going via 240v on an invertor.

 

[OllieGBR]

I assume you’ve looked for an actual 12v supply charger that would do it? Would be more efficient than going via 240v on an invertor.

I didn't think such a thing exists? I would still need something that will convert 12v to 42v, (the ebike battery voltage).
The inverter will also allow me to charge my laptop as I work from home and when lockdown ends my home will be somewhere on the road for a while

 

[Jason Stancliffe]

Hi
I have a streetwise inverter from go outdoors
3000w max, 1500w contiuous, about £200, modified sine wave, had it over 2 years now no probs, powers my microwave easy enough, not found anything yet that doesn’t work with it

 

[oldiebut goodie]

Buck boost dc to dc makes sense.
BCA Series | Bi-Directional DC-DC | Calex Product | Trusted UK Distributor

 

[OllieGBR]

A DC-DC converter has had me thinking about the possibilities.
Thanks for the link @oldiebut goodie
The unanswered question is thus; Does the e-bike power supply just kick out 42v over a simple +ve and -ve pin collection. Or, more likely is there some protocol/ communication across these pins to interrogate the battery and provide some simple diagnostics before the power is switched on?

 

[Deaks]

I think that the charger is quite a bit more involved than just putting 42 volts into the battery.
I put in a Renogy 2000 watt PSW inverter mainly for charging my Bosch e bike charger.
I have a small microwave and an espresso machine too.
I have 2 x 130Ah valence lithium batteries charged by Victron chargers and a 320 watt panel.
It seems to cope very well so far.

Deaks

 

[Pete C]

A DC-DC converter has had me thinking about the possibilities.
Thanks for the link @oldiebut goodie
The unanswered question is thus; Does the e-bike power supply just kick out 42v over a simple +ve and -ve pin collection. Or, more likely is there some protocol/ communication across these pins to interrogate the battery and provide some simple diagnostics before the power is switched on?

There is bound to be more to your 240v to 42v charger than a simple 42v constant volts output.
In this instance I would stick with the inefficiency of a decent inverter, and use the mains charger provided with the bike.

Pete

 

[OllieGBR]

Thanks Gents - 1200W Victron unit ordered