Quote:
Originally Posted by twinboat
If you only have room for 3 batteries, you will have a choice to use 3, 12 volt type or only 2, 6 volt batteries.
You still may get more capacity with 2, 6 volt batteries, if you get 200 AH GC2s. Two 200 AH 6 volt batteries wired in series gives you 200 AH at 12 volts.
Some gp24 batteries are only 65 AH each. Three of them will add up to 195 AH.
If you can fit gp27 or gp31 batteries, then you can get up to between 85 and 105 AH batteries each, or. 255 or 315 AH total.
Keep in mind that unless spicificicly built as deep cycle ( expensive ) , most 12 volt batteries will not last as long as 6 volt gc2 batteries.
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Too add to this above..
1. Budget.
2. Usage or need
3. Space
IF Budget is large then NO Question get Lithium...
smaller in size per AH, lighter in weight, can be recharged many more times (100s more) before they are junk. The bigger thing is use capacity.. You can run them way lower for more AH use.
If you have a medium budget then AGM , either 6V or 12V depends on space, They are said to charge faster than flooded, they dont need water and last a bit longer than flooded.. Size and weight the same as flooded..
On a budget or use batteries sparingly or as more of a back up.. Then Flooded lead acid is the typical battery .
groups 24/27/29-31 Amp Hr 60-75/85-100/105-110
Group GC2 Golf Cart.. 6v will have 180-240 AH depends on brand. 220 seem the norm.. They are smaller like a Group 24 in foot print but almost 2 in taller.. so if under a step compartment , watch..
You need 2 6V and you wire + to - on battery with a jumper, then your house = and - to the other 2 remaining terminals.
The 6V will give you the most AH or any of the lead acids for the footprint if you have the hieght,, There is also 4GC that are like 9x9 by 20 ish, 390-420 AH, 2 of those will power you for a while
Charging for the Flooded are all the same 6 or 12.. just check water..
The OTHER Caveat is the Lithium at 210 AH will allow a steady power draw of 170 AH before you will notice voltage drop off rapidly... and then recharge pretty quick
AGM/Flooded at 210-220 AH will draw steady to 100-120 AH then voltage will fall, lights will glow and work for a while but inverters and our heater fans will stop alot faster..
In My Real world use of comparing 2 24 and 2 27 . My use window is 8pm or 9pm til 7/8am.. so 10-12 hours...
I run my inverter 2000w.. TV is on 6 of those hours, a small fan a few lights for 4-5 hours.. A mid size dorm refrig.. phone chargers ..
my watt meter tracks an average of 6-7 AH..
SO my 2/24 with 140ish AH will usually let the Keurig run fine at 6am.. The 2/27 will let me run the Keurig at 6am and the wife at arounad7am before I hear the beep beep on inverter.. Some times we are good and some days one coffee LOL..
NOW in my other RV, the Minnie, I tried same batteries.. Tried the Dometic Fridge on Electric thru inverter.. same TV a porch light, nite light... etc..
The 2/24 will konk out from 9pm to 5am.. no coffee.
I just tested the same 2/24s . the day, 2 lights on, TV and heater running on a 20-30 degree day. set to 60 inside.. 8am till 7pm before the chirps. shut of inveter nad heat ran till 9pm but it was about done..
The 2/27s give me another 1.5 to 2.5 hrs depending...
I want to try and fit 2/28-31 and a 3rd 27 next to inverter.. I would then have plenty..
YES I type long storys.. forgive me..