Metering Home Charger

boardzz

I was thinking about the best way to calculate the amount of Kwh used for charging ev.
One of these is for looking at usage of entire home by clamping onto entry point of electricity. I wonder can I simply clamp this to the cable leading to my charging point in the same way.
or
One of these simply takes input and gives output and calculates the usage.

Has anybody done this?

zilog_jones

I would be suspicious of that second product as it seems to be some unknown brand with no indication of any real certification - CE mark is as good as useless. Personally I wouldn't use such a product for a high-current mains installation.

At least the other device is not directly connecting to the mains, however I see many reviews for items like this saying they aren't very accurate (same for a lot of the plug-in type meters).

oinkely

I got a kW/hr meter that mounts on the fuse board and the evse cabling is routed through it. Measures the usage on that circuit. Can't say how well it works yet cause its still in the glovebox in the van! Was about 35 euro from eurosales.
It doesn't differentiate between day and night units though, a fancier one costing in the region of 150 euro was needed for that functionality.

BoatMad

Any clamp style kWh meter will suffice. You will however have to locate the live wire to the evse on its own to put the clamp on.

Deduct the evse reading from the total meter

Alternatively profile the car by simply reading your meter over a few days and you can easily work out what the average units consumed is

BoatMad

zilog_jones wrote: »

I would be suspicious of that second product as it seems to be some unknown brand with no indication of any real certification - CE mark is as good as useless. Personally I wouldn't use such a product for a high-current mains installation.

At least the other device is not directly connecting to the mains, however I see many reviews for items like this saying they aren't very accurate (same for a lot of the plug-in type meters).

Hager do a range of wired in kWh meters. Reliable brand

boardzz

oinkely wrote: »

I got a kW/hr meter that mounts on the fuse board and the evse cabling is routed through it. Measures the usage on that circuit. Can't say how well it works yet cause its still in the glovebox in the van! Was about 35 euro from eurosales.
It doesn't differentiate between day and night units though, a fancier one costing in the region of 150 euro was needed for that functionality.

Where did you buy that? How much?

BoatMad

boardzz wrote: »

Where did you buy that? How much?

Eurosales do a lot of Hagler . so it may be one of their range

heres a typical unit from a reputable supplier http://ie.rs-online.com/web/p/digital-power-meters/8718302/

which does look surprisingly similar to this http://www.aliexpress.com/item/SDM120C-Single-Phase-Two-Wire-Din-Rail-Energy-Meter-with-RS485-Modbus-and-Pulse-Output-CE/32349129725.html?spm=2114.01010208.3.10.jDOuwD&ws_ab_test=searchweb201556_10,searchweb201602_4_10017_10034_10021_507_10022_10032_10020_10009_10008_10018_10019,searchweb201603_1&btsid=d9a95e54-dc68-4bf4-a842-2cb4bec473ee

Note that if fitting these to the distribution board , thats a RECI certified job. You could out it inline with the supply feed to the EVSE , in a little consumer box, this is not a mod to the distribution board and hence not RECI certifiable


Dual tariff units , so that you can seperate night and day , are about 180 euros upwards

usual disclaimers apply !

oinkely

boardzz wrote: »

oinkely wrote: »

I got a kW/hr meter that mounts on the fuse board and the evse cabling is routed through it. Measures the usage on that circuit. Can't say how well it works yet cause its still in the glovebox in the van! Was about 35 euro from eurosales.
It doesn't differentiate between day and night units though, a fancier one costing in the region of 150 euro was needed for that functionality.

Where did you buy that? How much?

Add your reply here.
In eurosales in sandyford. Cost about 35 euro including vat. As boatmad says, it goes in the fuseboard, so qualified sparks required.

I'll post a link to the dual tariff one I found, it was from an Irish distributor and cost around 150 euro.