My other system components, all Renogy, 100AH AGM battery, single 100W flex solar panel on Van roof, DCC50S DC to DC & MPPT controller, 1000W 120V inverter. Small DC loads, LED lights, 12v cooler Etc. Application supports Weekend adventures only. Not full time vanlifer.
My other system components, all Renogy, 100AH AGM battery, single 100W flex solar panel on Van roof, DCC50S DC to DC & MPPT controller, 1000W 120V inverter. Small DC loads, LED lights, 12v cooler Etc
@Vanpackr posted a write up on the BT-2 on his website. Renogy BT-2 Bluetooth Dongle for the DCC50S
Not sure if there is any benefit to the Renogy monitor since all your other stuff is Renogy, but FWIW the Victron battery monitor seem to be popular (and well liked) even by folks with systems that are not Victron based.
(I have no personal experience with any of these, just what I have learned from spending too much time on this forum)
The DCC50S charges your battery. The BT2 allows you to set a custom profile for the DCC50S. This is important if you are running lithium batteries as the default profile for lithium sucks. The monitor allows you to keep track of the amp hours pulled out of the battery.
Sorry to take this OT, but what are you basing this on? I didn't agonize over it, but I thought the defaults looked OK for my LiFePo4's. Maybe I should check that again?
for a 12V LFP battery "100% full" is 14.6V or 3.65V/cell The renogy settings look like they'll kill your battery if I'm reading that correctly. Usual recommendations for LFP are somewhere in the 14 - 14.4V boost charge and shutdown at no more than 14.6V.
We cover the basics of charging lithium batteries and the different components that are compatible with our LiFePO4 technology!
battlebornbatteries.com
It's going to depend a little on the brand. Here's an excerpt from the above linked page:
"For a 12V system, we really want to emphasize reaching 14.2V – 14.6V for bulk and absorption and float to be 13.6V or lower. "
(They do note multiple times that floating is not necessary or desirable, but that with some chargers this can't be shut off completely.)
Hence the 14.2 I'm seeing is on the low side. Frankly I'm not completely sure what they've meant by "shutdown voltage". Unless maybe if the output ever senses that voltage it won't charge - but it will never get that high unless something else is causing a fault.
There are effectively two stages for charging LiFePo4 batteries: 1. constant current (bulk), 2. constant voltage (absorbtion). When trying to accomplish these, feedback tells the charger what's happening with the battery. Entire books have been written on the subject, so this is an oversimplification.
A BMS between the cells and charger complicates things because it often requires higher voltages for balancing and/or have lower current capabilities than the cells. Internally the cell voltage is different than what's being applied to the terminals.
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