First, How do we calculate the recharge rate of a battery bank to run our Electric vehicle ? The answer to that question consists of four factors:

• the Average full sunlight hours in your area.



• the amp/Hours of batteries at the 20 hour rate.



• the maximum power current for your Solar module.



• the discharge rate of your battery bank.



• 1st Example: 8 - 12 Volt - 130/ampheres/hour batteries = 1040 amp hours

A) At a 20 % depth of discharge = 208 amp/hours drawn 7.1 Amps from module multiplied by 5 hours full sunlight = 35.5 module amps 208 amp/hours discharge divide by 35.5 module amps = 5.9 or 6 Solar modules

B) At a 50% discharge = 520 AH draw = 14.6 or 15 modules needed to fully recharge the 8 battery, battery pack

2nd Example: 8 - 12 volt - 200 amps/hour batteries = 1600 amp hours

A) At a 20 % depth of discharge = 320 amp/hours drawn 7.1 amps from module multiplied by 5 hours full sunlight = 35.5 module amps 320 amp/hours discharge divide by 35.5 module amps = 9 Solar modules

B) At a 50 % discharge = 800 AH draw = 22.3 or 23 modules needed to fully recharge the 8 battery, battery pack

As for producing energy on Cloudy Days, the amount of current produced depends on how much light is able to penetrate the clouds. Any module will produce some current during a cloudy day. Generally, when I design a system, I will try and design within 5 to 10 days of autonomy.

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