a/c drawing high amps

[superglide 317]

Hello,once again i am needing advise.My 2021 thor Outlaw roof a/c is drawing 110amps as it runs.It cools fine but with that much amp draw my 920 Ah battery bank won't last very long.I am monitoring my batteries with a Victron monitor.With solar running it brings it down to around 80amps but i keep seeing 10 to 15 amps for a 13,5k btu unit.I have a soft start but everything stays the same.3000k inverter 4/0 cables throughout.A voltage drop of .4 volts.Any advise as to where to go from here?

 

[16ACE27]

Amps mean nothing unless you include volts.

Your A/C is not using 110 AC amps.

Your inverter may be pulling 110 DC amps to supply your AC loads

That roughly equates to 11 AC amps which is low for a RV A/C unit.

I don't think you have an issue.

 

[superglide 317]

Thanks for the reply,volts are at 12.9 while running a/c.How did you come to the figure of 11amps fpr a/c? The battery monitor is showing 110 amps when i turn on the a/c with no other loads.

 

[16ACE27]

Thanks for the reply,volts are at 12.9 while running a/c.How did you come to the figure of 11amps fpr a/c? The battery monitor is showing 110 amps when i turn on the a/c with no other loads.

10:1 rule of thumb between 12 VDC circuits and 120 VAC circuits.

12.9 VDC x 110 amps = 1419 Watts
1419 Watts/120 VAC = 11.8 Amps AC

 

[PS89]

Your AC's power draw from your battery bank via an inverter is completely normal. You're just misinterpreting what you are seeing.

 

[superglide 317]

10:1 rule of thumb between 12 VDC circuits and 120 VAC circuits.

12.9 VDC x 110 amps = 1419 Watts
1419 Watts/120 VAC = 11.8 Amps AC

Thanks for the reply.Now that i understand i can live with that.That explains how i can run the garage a/c at the same time.

 

[superglide 317]

Your AC's power draw from your battery bank via an inverter is completely normal. You're just misinterpreting what you are seeing.

Thanks for the reply.It was explained to me by doing the formula of volts x amps=wattts.So when i'm at the campgroungd i will hook up my watch dog and see what the draw is without converter.Easier than climbingn on the roof to check it...

 

[PS89]

You can check the AC draw at the output of your INVERTER or the load center's circuit breaker, if you're configured so you can get an AC clamp meter on the hot lead.