Installing Custom Solar Battery Charging Systems on Recreational Vehicles in
the Denver Metro Area

#### 12 Volt Deep Cycle Batteries verses 6 Volt Deep Cycle Batteries

**What is the difference between 6 volt and 12 volt deep cycle
batteries?**

If you looked into choosing the right battery. Then you've learned about
cranking, hybrid, and deep cycle batteries and you've learned about true
deep cycle batteries.

But what about battery sizes... 6 volt verses 12 volt. Some say two 6
volt batteries are better than two 12 volt batteries.

First let’s look at the make up of each type of battery. Both are lead
acid batteries, both contain 2.1 volt cells. Three cells in the 6 volt
battery and six cells in the 12 volt battery. The 6 volt battery has more
space per cell than the 12 volt hybrid so the plates are thicker and will
last longer. The 6 volt will be able to discharge deeper than any hybrid 12
volt deep cycle. Two 6 volt deep cycle batteries are a much better buy than
two hybrid 12 volt batteries.

###### But comparing true deep cycle 6 volt batteries verses true deep cycle 12
volt batteries is more about dimensional size and weight than any thing
else.

I have two customers both having 420 amp hour (Ah) battery banks. One
with four 6 volt deep cycle batteries and one with two 12 volt deep cycle
batteries. Both perform equally well, so why did we choose one over the
other? Size of the battery bay in the Rv's. One was tall and narrow and one
was short and wide. This is where dimensional size comes into play.

If we installed two 6 volt deep cycle batteries in the tall narrow bay
the customer would of only had 210 ah of storage capacity, so the 12 volt
industrial deep cycle batteries were the best option for this customer.

But 6 volt batteries are a lot easier to handle at 50 to 60 pounds each.
Rather than the 12 volt industrials at 110 pounds each.

When installing two 6 volt batteries wired in series the amp hours remain
the same and the voltage is doubled. Example: Two 200 amp hour 6 volt
batteries wired in series equals one 12 volt 200 amp hour battery.

When working with two 12 volt batteries wired in parallel the voltage
remains the same and amp hours are doubled. Example: Two 100 amp hour 12
volt batteries wired in parallel, makes one 12 volt 200 amp hour battery
bank.