What is the difference between the H1 and H1A models?
Both have an auxiliary channel, however, the signal range of the channel is differeent. The H1 accepts a 0-50mV signal from a shunt that must be placed in the negative lead of the charge source, such as solar panels, wind generators, or alternators with an isolated negative lead. The H1 displays the 0-50 mV as 0-200 Amps. The H1A accepts an auxiliary input signal of 0-2V, which is displayed as 0-200 Amps. The Alternator Current Sensor is designed to provide a 0-2V signal from a shunt that is placed in the positive lead of a charge source. Obviously, it is most economical to measure current in the negative lead, so even if you want to measure alterntor current it may be best to purchase an alternator with insultated negative outputs. All of Ample Power large frame units have insulated negative outputs, while all small frame alternators can be ordered with insulated grounds.
