Watt Meter for 60+V battery?

[superjonnyboy]

Hi all,

Can anyone point me in the direction of a watt meter that I can use with my 16S battery that reads 67.2V fully charged. All the usual Turnigy types seem to be rated to 60V. Or, will the Turnigy actually cope with 67.2V?

Cheers

Edit: Another question - can an in-line watt meter be used when charging to display the Ah replaced, like typical RC chargers do? If so would it need to be reversed so the charger is the source and the battery the load?

 

[Nealh]

http://www.ebay.co.uk/itm/New-DC-0-90V-0-30A-Voltage-Current-Energy-Power-Watt-Meter-HHO-EV-car-Solar-Wind-/171854390188?hash=item280351e3ac:g:L9kAAOSwDNdVwf3N

http://www.ebay.co.uk/itm/DC-50A-LCD-Voltage-Current-KWh-Watt-Car-Battery-Panel-Power-Monitor-Combo-Meter/181814316903?ssPageName=STRK:MEBIDX:IT&_trksid=p2055119.m1438.l2649

 

[superjonnyboy]

Thanks for the links Nealh.

Doesn't look like I'll get a neat all in one unit like the Turnigy, these require external shunts, they'd be good for charging though (if they can be used in that application) to measure the actual Ah put back into the pack.

The one in the second link looks like it might work as it will power up from the supply voltage up to 100V whereas the first one is 40V max.

 

[superjonnyboy]

Looks like I was using the wrong search terms. Now I've got the scent I found this one with an internal shunt (up to 20A)

http://www.ebay.co.uk/itm/DC-6-5-100V-20A-50A-100A-LCD-Digital-Combo-Panel-Meter-Amp-Power-Voltage-Watt-/162051581478

Could I use this for charging? Charger as supply, battery as load?

 

[Deleted member 4366]

That one has an external shunt. Surely, an external shunt is better?

 

[superjonnyboy]

There are several versions, the lowest rating of which (20A) has an internal shunt.

In response to your question, I don't know, is it? I was thinking internal was better purely for packaging reasons, I don't know what other pros/cons there are to internal/external shunts.

All a bit academic anyway unless I can find out if it can be used for recording cumulative Ah during charging.