AGM Batteries

One of the primary components required for operating a solar generator is the deep-cycle battery.  We utilize two sizes for our systems with one at 110Amp-hours and the the largest is a generous 153Amp-Hour @ 24hr rate, high performance, Mil-Spec, VRLA-AGM deep cycle battery.  Our batteries have a 1 year warranty and the 153Ah battery is proudly MADE IN THE U.S.A.! 

Even better, when your JASPak arrives, it is already fully charged and ready for work!

Battery Technologies

VRLA-AGM, or valve regulated lead acid batteries with Absorbed Glass Mat construction are built on non-spillable construction which prohibits any electrolyte leaking or spewing, allowing the battery to be used upright or on its end or side.   This technology creates a completely sealed and maintenance-free battery with no need to add water and provides your JASPak solar generator with more power in the same space when compared to conventional batteries. These batteries were chosen for their superior reliability, power & extended cycle life.  With the proper care and attention as documented in our manual, our batteries will provide you years of reliable service and close to 1000 charge/discharge cycles.

Battery Ratings

Rated in amp-hours, this is the standard measure of the energy storage capacity of the battery.  This number should be of paramount importance when looking at portable backup power.  Amp-Hours are calculated by multiplying the flowing current, in amps by the time, in hours of discharge.  Our 153Ah battery is calculated to provide 6.375 amps an hour for 24 hours and deliver 153 amp hours before the voltage drops to about 10.50 volts and the battery is considered to be at 100% discharged and can no longer provide power.

Battery Basics

To get the most out of any battery, it is very important to understand how a battery operates and what it needs to remain reliable.

1.  Depth Of Discharge (DoD):  Perhaps the most important factor that affects the life of your battery is how you use it.  When you use a battery, you are discharging it, or using the charge.  How much you use it per charge determines the depth of the discharge.  The general rule is to NOT EXCEED 50% DoD.  Based on this general industry rule, all JASPak statements, calculations and advertising are based on 50% DoD.  Many others advertise to 100% DoD and that is not how you want to run a system that costs thousands of dollars.  Too many uses to 100% DoD will begin to erode battery capacity and shorten the life.

2.  State Of Charge (SoC):  A battery is evaluated and measured in volts.  The voltage at the battery terminals, after it has been left to rest for 10 minutes with no load will tell you the available capacity remaining, or the state of charge.  Except while in use, your SoC on the JASPak solar generator should always be at 100% charged.  We provide a state-of-the-art battery maintainer/charger with all units as a standard to keep you ready at all times!  Keeping your battery at 100% SoC prevents the growth of sulfate crystals on the plates inside and preserves your battery from premature failure due to sulfation.

For a battery to be considered fully charged and at 100% SoC, the individual cell of the battery should measure to 2.13 volts, or higher.  If all 6 cells measure to this, the battery should measure to 12.78 volts or higher can be considered to be at 100%.  When the battery measures to 2.08volts/cell, or 12.5v in total, the battery can be considered to be at 75%.

Battery Status

State Of Charge % (SoC)

*OCV / Cell

*OCV/12v Battery














1.93 or less

11.6 or less

 *OCV = Open Circuit Voltage.  The measurement from the positive to negative terminal with no load on the battery for at least 10 minutes.

3.  Charging:  After your battery has been discharged for any length of time, it must be put back on charge as soon as possible.  If you use the included AC charger, or if you recharge with the solar panel – it should be done as soon as it safe and feasible.  If your battery is left in a state of charge less than 100% for an extended period of time, the plates on the inside of the battery begin to grow sulafte crystals.  As these crystals grow due to lack of a full charge, the capacity of the battery can begin to be affected.

Please note:  The growth of sulfates on the JASPak solar generator battery is not as large of a concern as our included AC charge constantly monitors and de-sulaftes the battery to keep it in like-new condition at all times, but the others out there do not provide this.  This does not indicate that you can leave your JASPak solar generator in a state of charge less than 100% as that is not a recommended or warranted condition.

 4.  DC and AC Power:  Batteries provide DC, or direct current.  Most operate at 12 volts, but there are some that are 2 volts and 6 volts.  Your home uses AC, or alternating current.  It operates at 110v/220v.  In order to use a DC battery to power things that run on AC “house power”, the battery DC must be changed to AC by use of an inverter.  Inverters do the work of changing the DC to AC so you can plug in your television or other household appliance.  Most inverters are rated by watts – continuous watts and surge watts.  You battery is responsible for providing that inverter with the power it needs. A general rule for calculating your power needs is every 100 watts of AC that you require, your battery must provide 10 amps.