Originally Posted by ;2430852
... use 1/2 an amp per hour.
Some other brands, I have seen, use up to 4 amps per hour...
Originally Posted by 2430508
….As an example the phantom draw in our coach is around 4 amps each hour.
[moderator edit] I show [moderator edit], for example, a 10 amp PV solar module. They then ask me, is that 10 amps per hour?
Let’s look at this often used phrase, “amps per hour”. You see it used quite often in forums discussing power. Would you believe that this phrase is meaningless? It is! If I told you my car can produce 400 horsepower per hour you would wonder what I am saying. Am I saying it’s 400HP only if I run it for 1 hour? Or, does it take 1 hour to make 400HP? What if I only ran it for 1 minute? Then would I say it is 400HP per minute? Again confusing.
Amperes or amps is the term that defines current flowing in a circuit. If I turn on a load that is drawing 10 amps, it does not matter if the time is 1 second, 1 hour or 1 week. It is just a measure of current flowing and time has nothing to do with it.
The confusion comes from another term that does relate to time, “amp-hours” or AH. It is a reference to a quantity of something, much like a gallon is a quantity of a liquid. Amp-hours are a quantity of current flowing multiplied by time. A 10 amp load running for 1 hour is 1AH. But what if the load is only for 30 minutes or 0.5 hours? Multiply time (in hours) by the load: 0.5 X 10 = 5AH. If the load was for just 1 minute it would be 0.16 AH used.
The same applies to the term Watts and Watt-Hours. Watts is a measure of power, Watt-hours is power over an amount of time.
So, there is no such thing as "amps per hour" like there is no such thing as HP per hour.
Amps = current
AH = current over time
Watts = power
Watt-hour = power over time
I have a vast knowledge about PV solar, batteries and inverters. I'll try to provide the best answer if I know it and hopefully correct some "Campfire" talk.
Full-time 1999-2004. Part time now. '92 Hawkins, 360AH Lithium Battery, 1480 Watts PV solar.