6 volt deep cycle batts

Hi John,

I don't know either, the 2 6 volt 220amphr batts I have in my van have worked a treat for at least 4 and a bit yrs. They are only just now starting to fade, but I think that's because I don't use them as much as I used to.
Only downside to this is their weight (56 or 58kgs) in total.

Cheers Trevor.

PS Comet battries used to have the best prices in our area if you want to go further with the idea.

The 2 - 6volt deep-cycle batteries connected in series is all I have ever used in my set-up, mainly because of the capacity a 6volt battery will give you. Battery size - N70Z for 200amp capacity. Cheers.

6 volt batteries are not the only ones used these days, particular installers may use or recommend them, others use and recommend 12 volt batteries. The reason 12 volt are used al lot is due to availability, space and wiring and only one battery is needed, hence mounting and wiring may or may not be easier to achieve.

If an installation is set up with 6 volt batteries and one fails, then availability, depending on where you are comes into play. If it was a 12 volt, then any 12 volt will get you going until you can get the exact make/type of battery you want. Also fitment of 2 x 6 volt batteries next to each other is not always possible so 12 volt is used.

2 x 6 volt 100 A/Hr batteries in series is the same as 1 x 12 volt 100A/Hr battery

2 x 6 volt 200 A/Hr batteries in series is the same as 2 x 12volt 100A/Hr batteries in parallel

Sometimes the size and shape of 6 volt batteries may have an advantage for installation purposes, sometimes not.
There are a lot of AGM(absorbed glass mat) batteries out there in different shapes and sizes, all depends on what you want. Personally I prefer AGM batteries to GEL.

The amount of energy a battery can store is not related in any way to voltage, but more to the mass of lead and electrolyte it contains.

A six-volt 200 Ah battery theoretically stores 1200 watts. A 12-volt 100 Ah battery also stores 1200 watts.

Two six-volt 200 Ah batteries in series produce 12-volts at 200 Ah. Still 2400 watts.

Two 12-volt 100 Ah batteries in parallel produce 12-volts at 200 amps. Still 2400 watts!

In every case the weight will be about 40-50 kg.

There are various arguments for and against both methods of connection. Most are academic - in practice the pros and cons cancel out.

Fit whatever is most convenient!
Collyn Rivers

Ah ha!....... as they say

Thks Collyn

To P.G.
parrallel batteries ups the capacity at the same voltage
Series batteries ups the voltage at the same capacity as 1 battery

your analogy above was incorrect , 2 X 200amp batts in series is still 200 amps but 12 volts

Dave L

PG

I fear watt they taught you at school was wrong!

(Incidentally I was a research engineer. Electronics and electrical engineer were a couple of the things we had to know about).
Collyn Rivers