Lifeline GPL-27T AGM Battery Upgrade
Late last week I placed an order at bestconverter.com for two Lifeline GPL-27T AGM batteries to replace the two NAPA batteries the dealer installed in my 2016 Northern-Lite 8'11". The big brown truck...
Forum Discussion
landyacht318 wrote:
These lifelines, if cycled to 50% regularly, need a high amp recharge regularly too. Lifeline recommends 20 amp per 100Ah of capacity minimum when deeply cycled and no upper limits on charging amps. They flat out say more is better.
90 watts feeding 200AH of lifeline AGM, or Any AGM, is woefully inadequate if these batteries are ever discharged below 90%.
Expensive batteries to kill prematurely.
People tend to paint AGMs with a Super battery brush due to their price, but really they are finicky princesses waiting for an excuse to pack up all their shoes, belittle you, then leave, when their particular demands are not met.
if you cycle them deeply, feed them properly, be able to feed them at least 40 amps from their most depleted state until they reach 14.4v and hold 14.4v until amps required to hold them at 14.4 @77f tapers to just 1 amp.
If you can't do this, you will have very effective paperweights, very prematurely, for top dollar.
I have Northstar AGM group 27 at 90Ah capacity.
I removed 18Ah to take it to 80% State of charge.
How long do you think it took to recharge fully with a 40 amp capable charger?
3.5 hours at 14.5 volts before amps tapered to 0.45.
If this battery was not recently high amp recharged, it could take twice as long for amps to taper to 0.45 @ 14.5.
Lifeline is top quality, but it is not going to make up for improper recharging, and 90 watts for 200Ah is woefully inadequate.
The PD9245 would be a good converter for lifeline setpoints, but the PD9270 would be better.
Do not discount the need for an AGM to get a high amp recharge occasionally, at a minimum. 100% recharges achieved often are paramount, but so is the high amp recharge.
Do note lesser$$ AGMS have a 30 amp per 100Ah capacity maximum current, but even these AGMs will benefit from charge rates approaching 30% when cycled deeply, often.
If you can't properly charge a battery according to its needs, then get the cheapest flooded marine battery you can find, as it will hurt less when it fails prematurely.
Lifeline's huge $$ does not make it immune to improper charging. It actually is more demanding of proper and particular recharging parameters to achieve any where near its potential cycle lifespan.
X2
