SamTexas said:Geez Nicobie. That does not even come close to a wattmeter.
A x V = Watt
SamTexas said:Geez Nicobie. That does not even come close to a wattmeter.
OK, no argument from me. But your $4 figure does not work anymore. You need not one, but two DMM. You also need a shunt so you can read the current on the second DMM. And your brain needs work superfast to convert whatever voltage you see on the "A" meter to actual current and multiply with V to get your power. Watch out, here come another truck!nicobie said:SamTexas said:Geez Nicobie. That does not even come close to a wattmeter.
A x V = Watt
nicobie said:SamTexas said:Geez Nicobie. That does not even come close to a wattmeter.
A x V = Watt
amberwolf said:You can still use the originally-linked WM for your 100V+ pack, but in a way that doesnt' monitor watts or Wh or voltage quite right (yet is simple to recalculate).
Put a tap for the watt meter to go in on 1/2 your pack, so that it is only reading the voltage from half of it, keeping it under the likely 60V max even when fully charged.
Then just multiply the W, Wh, and voltage readings by two, and you'll have the correct numbers for those, within a reasonable accuracy.
The Amps and Ah will be correct either way.
http://www.endless-sphere.com/w/index.php/Setting_Up_a_Low-Voltage_Watt_Meter_for_a_High_Voltage_System
puddleglum said:Does anyone know if the watt meter in the first post would work well for a 24v system, just to tell Watt hours used? A CA would be nice, but it's overkill for my purpose.
Emoto said:Or buy one of these
i had the first metre good but prefer this one.
Emoto said:Yes your right, i should have elaborated, as you know there is a voltage mod for the turnigy but sadly only reads to 75v but working on 100v i think, http://endless-sphere.com/forums/viewtopic.php?f=31&t=17904. Is there a better mod thread jeramy ?
I would love to find a simple/cheaper watt-metre in the 100/120 v.
I wonder if enough of us contacted hobby king and requested a modified version of the turnigy to handle 150v/150amp that would be very popular.