Battey Run Time Hours

[branx86]

Volts =V
Amps = A
Watts =W


1st you need to know the wattage of the Items or Item. Use the formula  Volts x Amps = Watts  example freezer 120V x  5A =  600W(Load Watts)  , 12V 80Ah battery 12V  x 80A = 960W

2nd Watts of the battery divide into Watts of the items.   Battery Watts/ Load Watts =Watt Hour   960W/600W = 1.6Hr  Run time Hours (You don't want to run the full 1.6 Hours or you'll destroy your batteries!!!!


and you want to find out how many batteries to run a given item for a certain time frame use this formula: Time / Run time Hours = How many Batteries are needed.         For example 24Hours in 1 day 24 / 1.6 =15 Batteries


AMPS = WATTS / 12 (12 Volt DC system)
WATTS = AMPS x 110 (110 Volts AC is household current & used by appliance manufacturers to compute amps used by their devices)

When device power is listed in WATTS (example used is 120 watts & 153 Amp/hr battery):
120 watts / 12 volts (DC) = 10 amps per hour
153 Ahr / 10 amps = 15 hours run time *
* Built-in safeguards of the Grid Eraser system will shut down the system when the battery reaches approximately 20-24% of its rating resulting in 11 - 12 hours of run time before re-charging the battery is required.

When device power is listed in AMPS (example used is 2 amps & 153 Amp/hr battery)
2 amps x 110 volts (AC) = 220 watts
220 watts / 12 volts (DC) = 18 amps per hour
153 Ahr / 18 amps = 8.5 hours run time x 76%-80% = 6 – 6.8 hours before battery re-charge is required.

These measurements are an approximate "rule of thumb" as all electric/electronic devices will vary somewhat from their power ratings and can be affected by operating temperature, ambient temperature, cord length, level of battery charge, etc.

Keeping the solar panel connected to the charge controller during daylight hours while powering appliances and electronic devices will significantly reduce battery drain resulting in longer run times.

The inverter can power up to 1000 watts but as the calculations show, the battery would be drained in less than 2 hours with that constant load. The 1000 watt inverter is provided with the generator to allow for running high-wattage appliances and tools for short periods of time; such as using a circular saw intermittently, or a microwave. Although a refrigerator may have a high watt rating but the compressor (which requires the high watts) only runs approximately 30% of the time.
Providing solar powered products that don't harm the environment and allow you to start unplugging from the power grid while maintaining your lifestyle.

To know how many min a battery will Run a  item
The Formula is        ( Batt. Voltage * Batt. Amp Hour * Efficiency .9 for 90%) / Item Wattage =  hrs     Then  hrs * 60 = X min of run time