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How much power does my fridge use? How many watts will a solar panel produce in a day? What about battery size? Here is a handy dandy list of tools that our techs use when calculating the above, and so much more. Put the power in your own hands. Grab hold of your destiny. Carpe Diem! OK, that was a bit dramatic, but you get the picture. We do hope these tools help.


  • Solar Systems the Right Way
    There is quite a bit of info needed to correctly size your solar power backup system. We try to help answer these solar power questions and more daily here at Because these types of questions are so common, we have created an easy path that guides you with a few easy steps. Please refer to our article for further info. read more
  • Calculator | Determine Run Time for Specific Load
    This calculator is intended to help you figure out how long your lead-acid (Wet, AGM, Gel) battery will last under a specified load. In order to use this calculator you will need two separate AH ratings, given by the manufacturer, as well as the amperage, in direct current of your load. For an explanation of why a calculator is necessary to figure out the true run time of your battery see Puekert’s Law. read more
  • Calculator | AC to DC Amperage Conversion Calculator using a DC to AC Power Inverter
    This calculator was designed to figure out the amperage consumption of devices that are being run through pure sine wave inverters. For this calculation, we have figured an 85% efficiency level, and though some inverters can be less efficient and some slightly more, we feel it is an accurate medium range for most pure sine wave inverters. read more
  • Calculator | Sizing a 12 Volt Battery to a Load
    Do you need a 12 volt battery for your application but don't know what size? This calculator is designed to help you find a deep cycle battery when a continuous load is applied, not for cranking or starting purposes. If you know how much power your application takes to run, and the time you would like to run it, we'll recommend a 12 volt battery with a safe amount of AH (Amp Hours) that will give you the run time you need. read more
  • Calculator | Solar
    To accurately determine the correct solar system, please have the following information: The amount of draw (load) needed from the batteries, the total duration of the load in 24 hours, and the amount of direct sunlight in your area. For help using this calculator please read thought our detailed instructions. read more
  • Solar Calculator Tutorial
    First, the notes: We hope this solar calculator will make sizing your panels and batteries a little less painful. Keep in mind that this is only a calculator, and it will directly reflect whatever you, the user, inputs into the fields. If your base calculations are off by even a little bit, the results reflected can be skewed by quite a bit, so view this as a guide, not an absolute. read more
  • Math Behind the Magic
    Here are the formulas our calculators take into consideration while computing. What? You thought we would show our work step by step? You’re welcome to do it longhand if you like, but personally, I like my calculators better. read more
  • Peukert’s Law | A Nerd’s Attempt to Explain Battery Capacity
    When I first entered the arena of lead acid batteries and their neurotic tendencies, it was presented to me that the easiest way to rate and understand how long a lead-acid battery would last, would be to use the AH (Amp Hour) rating that is so often designated to them. I was told that if a battery was rated at 100AH, then that was more or less indicative that it would last either 100 hours under a 1 amp load, or 1 hour under a 100 amp load. It soon became apparent that this notion of order was false; everything previously understood had been a lie. read more
  • BCI Battery Group Size Chart
    Are you looking for a marine, RV, automotive, or solar PV battery? You may have heard common terms like a "group 24 battery" or "type 27 marine battery". These BCI Group Numbers define the physical dimensions of the battery case. This is important as some applications call for specific case sizes. The BCI does not determine the Amp Hours (AH) rating for the batteries, however, but there is a correlation between case size and AH rating. For deep cycle batteries, the larger the case size the more capacity the battery will usually have. read more
  • Battery Terminology
    A list of common technical terms and definitions referring to batteries, chargers, and electricity in general. This is a good place to start if you want to learn how to interpret the specifications on most of our products. read more