Originally Posted by Dave 430
Since a couple of you have mentioned that you have changed from the 8D to the 31 class to replace those. Can those be 2 12V 31's or do I need to stick with the 6V style. If I can use the 12 volts batteries in parallel do i still need to change my inverter settings?. Or is that a given, if I use 31 style 12 volt or 6 volt deep cycle batteries, I need to change the settings?
I'm asking because of the places I use in SoCal, they are completely booked up into July. I have very little knowledge or complete understanding of changing the inverter settings as suggested.
There are two factors at play here...
Inverter setting is for battery type Flooded vs AGM as they have different charging profiles for optimum performance. You inverter oper manual should list the setting avail and how to change it. Its not difficult and if needed several folks here can likely help if they know your inverter make & model.
Best house battery case size choice and V will depend on whether you want to stay with Flooded or go to AGM.
A pair of 6V GC flooded battys in series is the most economical for deep cycle use. Much better than GP31s as generally flooded Gzp 31s are designed for starting not deep cycle.
If you go AGM a pair of 6V GCs in series or a pair of GP 31s in parallel are roughly equivalent cost and AH capacity. AGMs will do a good job at both starting and deep cycle and why either will work well.
The neg with 6V in series is if one goes bad you lose everything.
With 12V you can disconnect one and still run with half the AH capacity.
Hope that clears some things up for you.
I'm familiar with Magnum inverters and can help if thats what you have.
You stated.... one of my 8D house battys.
Do you have 2?
If so making a switch would require replacing both with their equivalents that you choose as you should not mix batty types & age for best results. But if one 8D is aging out the other is likely not far behind.