I've recently purchased an Elroq, I've installed an EV 13a socket and have a "granny" charger with 6, 8 and 10amp settings. However the best amperage I can obtain on the 10amp settings is just over 7 amps. Is this normal or can more current be obtained? Perhaps this is a setting to protect owners from themselves!

Hello, welcome to the forum.

The charger ampere rating is the maximum available on that setting - back EMF of the battery being charged will limit the amps actually being supplied - unless the charger is a constant current type unit.

I'd think that a constant voltage type charger would be more likely for a lithium battery.

What is your battery SOC when you are seeing 7 Amps as a maximum at the start of charging session?

I'm not sure where you are based. Saying a 13A socket seems to suggest UK. Though having variable settings on a UK charger for a BS 13A socket is odd. Warrior193s post seems to be ralated to the 12v battery, given the HV battery is several hundred volts, and way more than the AC supply.

I was referring to HV battery, but the same principle applies to LV.

230 volts AC is used by EV 'granny charger' in UK, hence the low charge rate.

SOC was 38%, but the 7amp rate remains the same at all battery levels which makes me wonder if this has been deliberately set low for safety.

No idea about your car or your 3 pin lead. (I do not call it a charger as the AC charger is in the car.) So if the lead is set at 7 or 10 amps i get 1.6-2.1 kWh and at 16 amps near 2.3 kWh. I set at 10 amps though if plugging in at home.

Edited 20 March20 Mar by Evolution13

Crikey, at that rate it'll take you a week to charge the car. I take it you're waiting for the 7KWh wall charger to be installed? If not then you should get one or charge it at a public charging site.

@Scrounger No i am not waiting on a home charger. This is my 3rd EV with a small battery. First EV i did 60,000 miles for £500 using Public Chargers because most of Scotland was free. When i did start charging at home it was only a 32 kWh battery so some free or cheap charging and 7 hours offpeak Eon Next and maybe the odd hour at 30 pence or less a kWh. Now on 6 hours Offpeak and 9.5 pence a kWh. 3 nights charging after trips, or charge cheap locally on a Public charger if i need a full battery. Or just pay standard tariff for a few hours.

19 hours ago, Warrior193 said:

I was referring to HV battery, but the same principle applies to LV.

230 volts AC is used by EV 'granny charger' in UK, hence the low charge rate.

I'd take issue with that. The 230v isn't the issue. Our home charger, is 230v AC, but charges at 7kW. The reason granny chargers are limited to lower powers, is the current, not the voltage. A 13A socket cannot deliver more than 3kW (230v x 13A) and they can't do that for very long without overheating so generally are limited lower. A dedicated circuit, charger, and connection can have a 32A supply. 32x230 =7,360. hence the 7kW possible charge rate. And bear in mind, that with AC charging, all the charging control is in the car. The 'charger' plugged in can only offer a maximum charge rate, the car itself decides how much it will take, subject to the maximum offered by the 'charger'. If you move to 3 phase AC the rate can be higher, though it's common for BEVs to only use 2 of 3 available phases.

I was referring to standard BS1363 230 volt, 13 Amp household outlets which are the norm for 'granny charging' - 16 or 30 Amp outlets will be relatively uncommon in domestic properties unless installed for high-current applications.