Undrstm8ed
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Those figuring out secondary battery setups or situations may find this information more useful than say the guy wanting to see how long his system will play with the engine off and on Accessory..
How long your appliance will operate from a particular battery is dependent on the appliance's power consumption in watts (or AC amps x 115V), and the battery capacity. Low inverter efficiency, and improper battery wiring during installation can also reduce run time.
Calculating Run Time The following formula can be used to determine run time in most applications using a 12V battery or bank:
Example:
How long will my 100 watt TV run with my 150w inverter from my car's engine start battery (60 Ah)?
The load is well within the our inverter's maximum power rating, therefore the inverter itself will not limit the run time.
Engine start batteries should not be discharged below 90% remaining charge-state, and marine deep cycle batteries should not be discharged below 50% remaining charge state. Doing this will shorten the life of the battery based on most battery manufacturers' recommendations.
Some power invertors come factory equipped with a lighter plug for easy connection of smaller loads. However, for loads above 100W you will require direct connection to the battery terminals to eliminate a thin/long battery wire voltage loss that could drastically shorten the run time on a given system.
If you intend to use power tools for commercial use, or any load of 200W for more than 1 hour regularly (between battery recharging) you should install an auxiliary battery to provide power to the inverter. This battery should be a deep cycle type and sized to meet your run time expectations with the engine off. Deep cycle batteries most commonly available are 27 (90 Ah), 4D (150 Ah), 8D (220 Ah) capacity.
The auxiliary battery should be connected to the alternator through an isolator module to prevent the inverter from discharging the engine start battery when the engine is off.
Hope this helps others...
Last edited on Tue Nov 21st, 2017 02:03 am by Undrstm8ed
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