Instructions / Assembly

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System Sizing: Step 4 - Battery Bank Sizing
The GS-100+ Preconfigured Kits do not come with batteries, but will work with most deep cycle batteries.
A deep cycle battery is designed to be charged and discharged regularly, unlike standard car batteries that
are meant to hold a somewhat constant charge. Deep cycle batteries come in many forms including lead
acid, sealed AGM and Lithium Ion. A typical deep cycle battery can discharge about 50% of it’s Amp hour
(Ah) capacity.
If you need a battery to store 1200Wh of charge you first need to convert the 1200Wh to Ah by dividing it
by 12V (the voltage of a battery) to get 100Ah. Since the battery can only discharge 50% of it’s capacity,
you must divide the 100Ah by 50% to get 200Ah. A 200Ah battery bank will store 1200Wh of usable
power.
1200 Wh / 12 V = 100 Ah 100 Ah / 0.50 = 200 Ah battery bank
Lighting example:
Four 15W LEDs for 8 hours per day, one day back-up
480 Wh / 12 V = 40 Ah (40 Ah / 0.50) x 1 day = 80 Ah battery bank
Pumps and Motors example:
One 1hp pump for 1/2 hour per day, three day back-up
373 Wh / 12 V = 31 Ah
(31 Ah / 0.50) x 3 days = 187 Ah battery bank
Misc. Electronics example:
One 65W laptop for 6 hours and one 800W microwave for 10 minutes, one week back-up
523 Wh / 12 V = 44 Ah
(44 Ah / 0.50) x 7 days = 616 Ah battery bank
Battery Connections:
Multiple batteries can be connected to each other to increase the
Amp Hour storage capacity of your system. Since the charge con-
troller and inverters in the GS-100+KIT are de- signed for 12V systems
it is important that multiple 12V batteries are connected in parallel
and if your system incorporates 6V batteries they should be con-
nected in series pairs.
Battery Life:
Batteries have a limited life. A battery that is discharged 50% every day will not last as long as a battery
that is only discharged 20% every day. Consider this when designing your system, adding “too many” bat-
GS-100+KIT EXPANDABLE PHOTOVOLTAIC
POWER GENERATION SYSTEM
CONFIGURATION MANUAL Rev. 140303
Valid from March 2014