Ok all I have a question about batteries and inverters.
I have a 1/3 hp sump pump that runs at 120v at 5.8 amps. So if I multiply the volts and the amps I get the watts which is 696.
Now I want to create a backup power source for my pump so that if the power goes out while I am at work it will still run.
I can buy an inverter/charger and hook the batteries and pump up to this and that could solve my problem. The pump would plug into the inverter/charger unit. The unit is then plugged into the regular house power source (outlet) and the battery (ies) are hooked up to the inverter/charger unit. When the power goes off, the batteries would take over and keep the pump running.
From everything I have read, I need to factor in roughly 15% for the inverter draw. So 15% of 696 watts is 104 watts making a total draw of 800 watts. to get the amp per hour draw I need to divide the watts by the volts so 800 watts/120v is 6.67 amps.
If I wanted to run the pump say 5 hours continuously (which I know it does not do in reality) I would then need a battery that could handle this.
5 hours * 6.67 amps = 33.5 amp/hours at 120 v or 335 amp/hour at 12v.
What would be the best battery (ies) for me to look at for something like this?
I would like to use a maintenance free type if at all possible. Are my assumptions correct or am I missing something?
Any feed back would be welcomed.
I have a 1/3 hp sump pump that runs at 120v at 5.8 amps. So if I multiply the volts and the amps I get the watts which is 696.
Now I want to create a backup power source for my pump so that if the power goes out while I am at work it will still run.
I can buy an inverter/charger and hook the batteries and pump up to this and that could solve my problem. The pump would plug into the inverter/charger unit. The unit is then plugged into the regular house power source (outlet) and the battery (ies) are hooked up to the inverter/charger unit. When the power goes off, the batteries would take over and keep the pump running.
From everything I have read, I need to factor in roughly 15% for the inverter draw. So 15% of 696 watts is 104 watts making a total draw of 800 watts. to get the amp per hour draw I need to divide the watts by the volts so 800 watts/120v is 6.67 amps.
If I wanted to run the pump say 5 hours continuously (which I know it does not do in reality) I would then need a battery that could handle this.
5 hours * 6.67 amps = 33.5 amp/hours at 120 v or 335 amp/hour at 12v.
What would be the best battery (ies) for me to look at for something like this?
I would like to use a maintenance free type if at all possible. Are my assumptions correct or am I missing something?
Any feed back would be welcomed.