power audit

[rawsondsr]

I'm going to undertake a power audit over the next few days - 

Items that give a wattage,how do i convert this to AH?

[LadyG]

https://www.bimblesolar.com/solarcalc

 

[Tony Brooks]

I don't much like the use of Watt hours as an intermediate to amp hours.

 

If its a 12V inapplicable divide the watts by 12 to get amps

If its a 24 volts appliance divide by 24

If its a mains voltage appliance run from an inverter divide the Watts by 20 to get amps from the battery to include inverter losses.

 

Sample calculations INCLUDING the battery capacity and charging time calcs here http://www.tb-training.co.uk/MarineE05.html#CALCULATING BATTERY CAPCITY

 

Note that that is only a guide, nothing is 100% reliable with batteries and charging, especially the charging time. The charging time of up to three to four hours is like to get you to about 80% charged or so.

 

[WotEver]

1 hour ago, Tony Brooks said:

If its a mains voltage appliance run from an inverter divide the Watts by 20 to get amps from the battery to include inverter losses.

That should read “divide by 10”

For 12V boats. 

[Tony Brooks]

9 hours ago, WotEver said:

That should read “divide by 10”

For 12V boats. 

Thanks - Moral, don’t post while supping red.