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Battery Sizing Calculator for Solar, UPS, and Energy Back-up Applications
  First Enter Next Enter Then Enter Output              
Input Total Load in Watts (Watts = KW x 1000) Nominal DC Voltage (12, 24, 48, 96, 120VDC etc.) Total Load Operating Time per Day (hours) Required System Amp-hour Capacity (Ah)  
→ System Amp-hours to 50% Depth of Discharge    
  Battery Type Number of 6 Volt Batteries in Series   Total Number of Batteries Required (Series & Parallel) Multiple Battery Size and Series/Parallel Connection Configurations Are Available - For the Most Efficient Operation and Longest Life, Always Use the Option with the Largest Battery Capacity and Fewest Parallel Strings.
420 L16HC
380 L16
360 L16E
340 US305HC
310 US305
290 US305E
280 US250HC
255 US250
225 US250E
251 US145
242 US125
232 US2200
      *Parallel connection of more than three (3) parallel strings is not recommended.      
           
           
  US Amp Minutes Minutes Amps Hours Hours     Discharge Rate @Requested Time Battery Capacity (Ah) @Operating Time
  Battery Hours @ @ (20hr. rate) @ @    
  Model (20hr. rate) 75amps 25amps 75amps 25amps n C
  L-16HC
  L-16
  L-16E
  US-305HC
  US-305
  US-305E
  US-250HC
  US-250
  US-250E
  US145
  US125
  US2200