Hi Mick
I can’t find it in the manual but from memory the magnum won’t go into absorb unless the volts drop below some number, which I can’t find.
Maybe tech support can help with that.
I’ve been using eg4 server rack batteries. It’s hard to beat the price, built in display, modular design, UL listed.
And not all lithium batteries want a constant charge voltage. Some do, some don’t.
Cheers Jay
Hi, Mechanix~ I have several local clients with various different versions of Magnum pure sine inverters & all of the inverters seem to transition to the float stage soon after the charge cycle begins. I've observed this even when the inverters & batteries were brand new. I'm aware of the menus about adjusting the bulk time duration but even adjusting that to the longest setting never helped.
Since these clients are all off grid with no generator automation, I just tweaked the float voltage to match the bulk voltage then instructed the clients to turn off their generator when the target voltage appears on their display. The batteries were always lead acid floodies.
Now that some of these clients need better batteries (& I hope they can afford transitioning to lithium), are there any mfr's for drop in replacement lithium which don't care if the gen-powered charger can't shift downward for the float voltage? The customers' PV chargers all have a float function that does work right. I know that Blue Planet suggests 55.2v DC for all charge stages, but my Magnum systems are all either 12v nominal or 24v nominal, so I'll need to find a different brand that builds the lower voltage batteries.
The clients can still shut down the generator when the target voltage is reached, but what if they fail to shut down soon after the setpoint is reached? I wouldn't want to put anybody's battery warranty at risk due to this strange charging quirk. Also, I'd like to know if any other Wrenchies have noticed this peculiarity with the Magnum inverters.
Thanks in advance; the Wrench List is The Bomb! Cell phone or for text messaging: 970-946-6584 ![]() ᐧ
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