The relatively cheap deep-cycle marine batteries made by Johnson Controls for Walmart at test to 100% discharges which is pretty unusual. I'm talking about the type 27s and 29s sold for electric trolling motors and not the "cranking" batteries.
No matter what battery you buy - the actual cost is how long it stays useful versus how many dollars you shell out. Any reputable battery maker will give info about any deep cycle battery in regard to how many 50% discharge cycles it can endure before it's worn out. Then simple math can calculate what is the best deal, dollar-wise.
If you pay twice the price for a Trojan and get twice the use - in some wayus it is no better then a cheaper battery that lasts half as long and costs half the price. Not unless you've got some real HD use in mind for an RV.
Where I live - there are no local Trojan dealers so shipping charges are added. NAPA sells the Trojan T-105 equivalents with no shipping charges and they are cheaper (or used to be). They are made by Deka, NAPA # 8143. I have a set in one of my RVs that lasted just as long as any T-105s I've had.
The down-side to golf-cart batteries is since they're 6 volt - you can yank them out of your RV when not used and put them into something else. I often use my 12 volt RV batteries and use them in diesel tractors in winter for starting. Kind of handy for that.
By the way - the Trojan T-105 "golf cart and scrubber" batteries are not considered true HD deep cycle batteries. The Trojan L-16s, yes.
The most HD deep cycle batteries made for long term use are 2 volts, not 6 volts and they often last 30 years. They also cost a small fortune.
One other issue. For somebody with an RV and running big draw applicances strictly off of batteries - and using an inverter - momentary voltage drop is a big issue. Most battery makers to not provide specs as to voltage drop versus draw. If running a big inverter, it really matters since inverters automatically shut down at 10.5 volts. Two Trojan T-105s hooked in series can only run a DC to AC inverter up to around a 1500 watt surge before voltage drops below 10.5 volts.
Outback is one of the few companies marking RV batteries with voltage-drop specs listed.
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