RE: "Watt's Up" R/C Watt Meter
Here are some sample measurements I took on a power system that draws around 15amps.
The first screen shown of the alternating LCD display can capture current peaks and voltage minimums (or droops). It also measures energy used (Wh) and power in watts (W).
The second and third screens show the same display alternate at different times. The charge level (Ah), power (W), current (A) and voltage (V) are all shown. Only the power in the lower right corner keeps the same units.
The "Watt's Up" watt meter has been optimized for the needs of the R/Cer with added features like charge display in Ah and power in Wh. Conventional equipment like a DVM often has insufficient current range and too much insertion loss due to internal resistance or long leads.