Battery Powered Lighting Our Test Results

Battery System Calculator

Battery Amp Hour Rating – This rating is based on the size of the battery that you purchase. The higher the amp hour rating the longer the lights will run. Our advice is to buy the largest battery that you can afford or carry. Portable or compact units are often rated in Watt Hours (Wh) or sometimes milliampere-hours (mAh). All of these numbers represent the capacity of the battery and can be easily converter to Amp Hours. Set this slider to your battery’s amp hour rating. Watt Hours / 12 = Amp Hours Milliampere-hours / 1000 = Amp Hours.

Battery Usage % – To maintain the long term life of your battery it is recommended to not drain the battery below 50% of it’s capacity. Set this slider to determine your usage percentage.

Wattage Draw – This is the amount of watts that are being used. To determine this number, take the wattage of each bulb that you are using and add them up.


Let There Be Light!!

On a dark and gloomy day at an art show in the 1980’s, the idea of battery powered booth lighting came to mind. A lot of time and energy was spent trying to solve the problem. Various configurations of 12-volt batteries, automotive, marine and RV light fixtures and bulbs were used to no avail. Needless to say, after several attempts the dream faded off into the distance…until now.

We were introduced to some really exciting LED technology. We put together a package to offer as a solution to booth lighting. After examining this system, the idea of running it on batteries came up again. We took an old 12-volt battery and charger that we had laying around and a power inverter and gave it a try. The results were promising. So much so, that we bought all new equipment as if we were starting new.

We realize that this might get a little “geeky” and may not be for everyone. We have tried to make this as clear as we can so that as many people can benefit from this as possible. So here we go!

We started with a regular acid flooded deep cycle marine battery that we bought at Sam’s Club. This battery was rated at 125 amp hours. The number of amp hours is indicative of the capacity of the battery. The higher the amp hour rating the longer the battery will last. There are other gel or glass mat type batteries that would be better suited for extensive traveling. These types of batteries are sealed, maintenance free and are typically more expensive. Choose the battery that best suits your needs. Our best advice is buy as large of capacity battery that you can afford or carry!

Next was a state of the art automatic battery charger. We found some affordable units on for around $60. The type we bought was automatic which means it won’t over charge your battery. It has a digital readout so you can see when the battery is fully charged and the amount of voltage being put into the battery. Also it is designed to handle all types and sizes of batteries. We bought the Schumacher SSC-1500A-CA Ship ‘N’ Shore 15 Amp SpeedCharge Charger with Battery Clamps.

When it comes to inverters, bigger is not always better. We settled on 200-watts. This was big enough to run all the lights, but not too big that it drew more amps than needed. We found that using a larger (400-watt) inverter drained the battery faster than the 200-watt. We bought ours from a local electronics store for around $20.

Other Items:
A couple of other things that we found we needed were a cigarette lighter to battery clip adapter and a good multi-meter. The battery clip adapter converts the cigarette lighter plug on the inverter to battery clips and the multi-meter will help you measure various aspects of set-up.

The Set up:
The battery adapter was clipped to the terminals on the battery. The inverter was then plugged into the adapter and the cords from each of the lights were plugged into the inverter. Our inverter only had 2 outlets, so we also used an extension cord to allow us to plug in 3 cords.

The Test:
As mentioned earlier, the amp hour rating measures the battery’s capacity. To determine the amp hours needed the formula is (amp hours = amps used x hours). Our multi-meter helped us determine that our system was using just shy of 9 amps. So based on the formula we should be able to get about 14 hours out of our battery. To help maintain the life of our battery and to keep the recharge time quicker, we chose to run our test for 8 hours.

Our 8 hours test ran over a 6-day period. We always started with a fully charged battery and ran 3 sets of track lighting each with 2-14watt Par30 LED bulbs for a total of 6 bulbs.

On the first 2 days, we connected the lights to a fully charged battery and monitored the voltage every hour. The voltage ranged from 13.7 volts in the beginning to 12.3 8 hours later. At the end of the 8 hours, we connected our automatic charger to the battery and allowed it to fully recharge, usually overnight. The system ran perfectly for these 8-hour test periods.

The third day we wanted to simulate traveling to an art show. The battery was fully charged on Friday morning, but we waited until Monday morning (72 hours later) to plug the lights back in. The results were the same, 8-hours with no problems.


Great light output and light quality
Save money on electrical booth fees
One system works on both 12-volts and 120-volts

Batteries are heavy to carry
System needs to be recharged every night after a show
Requires more effort to tend to battery

We couldn’t have asked for better results from this system, it worked flawlessly in our test. We had the same great light output with the battery as we did with running it on a regular electrical circuit. We have seen other 12-volt systems, but none with high light output (over 5400 lumens) while maintaining an even light distribution and lasting 8 hours between charges. Also being able to use regular electrical current when available and switching to battery power as needed is a huge added benefit. As always, your results may vary and anytime you are dealing with batteries and electricity safety is paramount. Please be careful. We are still working on these tests and if any new insight is developed we will definitely share that information too. Also if you have any information regarding your experiences with battery powered lighting please forward any relative information to

Lastly, here is a great link with a lot of great information regarding batteries and charging. Battery Basics

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