I'm looking to set up AGM batteries for my off-grid cabin, which runs on a 48V system. After using lithium batteries, we've decided to switch back to AGMs for a simpler setup since the system was originally designed for flooded lead-acid (FLA) batteries. We're trying to find a temporary solution until we can design a system that accommodates lithium batteries later on. Locally, I've found two options: the Duracell Ultra BCI Group 27M AGM battery for about $50 more than a Renogy 12V 100AH AGM battery. Is the Duracell worth the extra cost?
4 Answers
I see where you're going, but 12V 100AH LFP batteries are often cheaper than AGMs! It's really up to you, though. Both options you mentioned should work fine. Just a heads up, I've noticed a lot of complaints about Renogy recently, so I'd be cautious there.
AGMs are definitely less sensitive to cold than lithium batteries, but good insulation is still a smart move for maintaining their performance. Just make sure the batteries are protected from extreme temperatures!
Switching to AGMs is a solid choice, especially for cold environments where lithium can struggle. Just make sure to keep your discharge above 50% to maintain battery life. While Duracell is a decent brand, I'd recommend sticking with more reputable names like Full River, Rolls, or Trojan. Cheaper batteries often have less lead, which can impact performance. Also, consider larger batteries if possible, or even 6V L16 batteries for better longevity and efficiency.
Honestly, you might want to invest that money in improving your overall setup instead. AGMs will require more units to match the same capacity as lithium, and they aren't as efficient. Consider other upgrades like insulative measures for your solar panels or battery heaters—those can boost performance without breaking the bank.
Thanks for the insights! We're switching out our current series of 12V batteries for AGMs and plan to set the Magnum controller appropriately for AGM charging. We're aiming for a lifespan of 3-5 years before scaling up to lithium.