How Long Do AGM Deep Cycle Batteries Last Solar Lead Acid Battery Bank

I have 4/200 amph AGM that are in their 7th year and they're still running strong. Wired for 48 volts ad charged by 4/195 watt panels.

Do you think it makes a difference on how long the batteries last on if they are parralel or series wired? Which would get them to last longer than the other?

Higher volts in the 13s (thirteens) isn't bad because when you put a load on the system, it experiences a power dip from the inverter pulling power. This power dip is anywhere from 0.5 volts to 2 volts. But your system will shut off if it goes below 10.5 volts. So having it a bit higher than just 12 volts is good. Its not something to worry about. If it goes lower than 13 Volts then you trip the system too easily. You WANT them above 13.

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But do you have a charge controller that can brake the cut off of power if you get too much overload? (Is this why your power is so high?)

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Curious what kind of inverter you are using too.

I have a question for you. Hope you can reply.

It seems like AGM charge faster and have higher charge but less depth than many marine batteries. But marine batteries are more desirable for amp hours.

Would it be possible to have your power inverter key off drawing power from an AGM battery with the AGM battery being the lead battery connecting to the rest of the batteries being just normal deep amp hour marine batteries? My reasoning and question for this is... if you have a 12 V system, then the power inverter gets power dips every time you put a load on the system. But power inverters are programmed to shut off if the power dip is very high to protect the batteries (not go below like 10.5 volts). So this means a power system can't run devices that use very many watts if they don't have a higher initial volt battery connecting being the one connecting to the power inverter?

I also already have normal marine batteries that aren't reaching very high on the volts. I need like 1 battery to be slightly higher or around 13 Volts that could be the lead battery going into the inverter and hope that solves my issue of the power dips when the inverter wants to shut off?

So I'm wondering if this idea could work with... tricking the inverter a bit by having only the battery going to the inverter being a slightly higher voltage battery than the others (but still being somewhat close to 12 volts instead of 24 volts)? (It costs a lot to go to 24 volt conversion and not ready for that yet.)

Interesting, wonder the DOD applied to the use cycles...

great Tips , much appreciated