The Cost Of Charging

[Cyclezee]

This has probably been asked before, but is there a formula or does anyone know the cost of charging a battery.

I have read 10p or 8p, but obviously that depends on size of battery and the cost of the electricity used to charge it.
Would it also depend on the chemistry?

I ask because it would nice when asked to be able to say it costs x pence per Ah, and therefore to fully charge a y Ah battery costs ?

 

[Streethawk]

It depends on your electricity tariff. Mine costs 14p per KW, so just over a third of that to charge the 10ah 36v Aurora battery (360wh), plus a little the charger loses in heat. 5p perhaps?

 

[z0mb13e]

Sorry - duplicate post. Not sure what happened there...

 

[z0mb13e]

Switched mode power supplies are around 80% efficient so consider 20% lost to the charger and approximately the same for charging the cells (assuming 80% charge efficiency (source: Wikipedia) I would estimate about 900Wh to charge a Whisper 36v 14Ah battery and at 22p per kWh (British Gas Tier 1 pricing) comes out at about 20p.

(Don't take this as gospel, this is just 'back of the envelope' calculations and based on assumptions)

 

[flecc]

See this link on my Panasonic site for cost of charging the 10 Ah battery for that unit.
.

 

[Cyclezee]

Bizarre coincidence , two threads started on the same subject almost simultaneously. This one and this one http://www.pedelecs.co.uk/forum/electric-bicycles/7817-cost-recharging-battery.html

 

[flecc]

Yes, I was a bit baffled at seeing these, thought perhaps you weren't getting on with each other!

Can't be many answers to questions of cost that are so reassuring though.
.

 

[bert11]

I did a few quick calcs concluding about 4p for a full charge on a 10ah 36v battery.

I assumed charging efficiency is about 65%, a kWh of power costs 9p, the battery capacity is 360Wh