One battery or two
I know this question has been answered before, but not for me:) Buying a new travel trailer and the dealer recommends a single 12 volt battery. We have had double 12 volt batteries on our travel t...
Forum Discussion
philh wrote:
Are you better off with 2 6v golf cart batteries or 2 12v deep cycle batteries?
SoundGuy wrote:
Forum pundits will automatically say 2 GC-2 6 volt batteries but that ignores inherently higher internal resistance which can cause excessive voltage drop under heavy load from an inverter. A pair of 12 volt G31 batteries, especially AGMs, will offer similar capacity but with much lower internal resistance and therefore suffer less voltage drop under heavy inverter load. Secondly, a pair of GC-2s, while taller, will also have a smaller footprint than a pair of G31s so the space you have available also plays a role. So - the answer is, it depends on your intended use. ;)
time2roll wrote:
Unless you have a large inverter typical max load is less than 10 amps.
Sure, but a 10 amp load @ 12 vdc is just 120 watts - barely sufficient to power anything. With a 1000 watt PSW inverter I'd typically pull ~ 60 amps @ 12 vdc to run just the toaster. Voltage drop under load means the difference between the inverter handling the load OR the inverter alarming and shutting down due to excessively low incoming voltage which in turn is why battery internal resistance is an important consideration and why forum pundits' recommendations for dual 6 volt GC-2s over a pair of 12 volt G31s doesn't tell the whole story.
