I’m running interstates now but they are the cheap $100 Costco ones. My stereo is 2500 watts and kills all three in like 45 minutes. I was looking at the true deep cycle interstates and they had pretty good reviews. They are like $250 each. It’s maddening trying to pick which battery because there are 10,000 reviews and opinions on the internet about everything. I asked on here because the opinions are more real world.
Thank you
The 24 XHD is not a deep cycle,SRM are deep cycle. XHD is high perf cranking battery with 1000 CCA and 135 min reserve Capacity. SRM 24 has 140 min Reserve capacity. If you have room the SRM 29 or 31 interstate is 1 of the best deep cycle batteries on the planet with 210 min reserve Capacity. I get 7 years out of them on my trolling motor.
The only battery I would have in my truck camper. They are expensive and heavy but work very well.
My real world experience is from installing millions of dollars of lead acid and AGM batteries on large data center UPS systems. The batteries are essential to the uptime of the facilities, and I had to learn a lot of esoteric detail about them in order to choose the correct solution. If a UPS I installed dropped a customer load because of something I should have done differently, I didn't have that customer for repeat business.
Your stereo uses a bit over 200 amps at full blast. That means it'll discharge a 200 amp hour battery in one hour. If you have three of them, they should provide three hours of run time.
If you're discharging your batteries in 45 minutes, they are either too small, have been damaged by improper recharging, or you're asking too much of them. Use a DC ammeter to determine the rate of discharge, and use batteries with a sufficient amp hour capacity that will provide a longer run time or turn down the volume. There's no free lunch. You need to spend the money for three deep cycle 200 amp hour or larger batteries if you want to have decent run time...BUT, if you want your batteries to last more than a season or two, the amount of discharge must be monitored. Install a digital voltmeter on your battery bus, and monitor during use. When battery discharge reaches 50%, they should be shut down. Going to 40% is iffy. They will not run your stereo all day, you'll just end up killing them if you repeatedly overdischarge them.
To maximize life, spend the money for a three step electronic charger with a minimum of a 15 amp initial charge. a 20 amp initial charge is better. You'll hear the term "C" rate, and the proper C10 rate for a 200 amp hour battery is 20 amps. Never recharge a discharged deep cycle battery with a small battery charger or a battery tender, it'll quickly kill them.
2500 / 12 = 208
My Hallett was about 8,000 watts.. The spooled up toon was I believe 30,000 watts..
