More fun with Renogy MPPT and LFP
Toying with a new to me 12V compressor car fridge. Cheap Chinese box, LG compressor, 50L volume split ~28L fridge, 22L freezer. The goal was to see whether my added insulation made any difference: Ref...
Forum Discussion
This controller has a mind of its own.
Turned the load off - enough pushing Chinese fridge, don't want it to die on me in the bush.
Charging battery via DC charger and Renogy. This time charging stopped at 14.3 - right at the Boost voltage. Forget those High Volt Disconnect and Charge Limit set to 14.8.
At least, it stopped after 14.3, didn't try to fry it up to 15.5. Don't know how long after 14.3 it stopped, Boost timer was set to 10 minutes but it looked longer.
Display reads Float 13.9, then 13.8, 13.7. My Float is set to 13.3, this is Lithium, don't need Float. Current was zero amps at this point. This isn't Flooded, with no load it will stay forever at 13.7, should read "Full", not "Float", but its firmware is not that good. This Renogy is a wet/gel/AGM controller that you "can" make work for Lithium, with some pains.
Boost Charge Return was set to 13.8V - nope, didn't return to Boost at 13.7 even.
Turned the Load on, fridge drawing 2A, now Renogy initiates Boost at 0.6A, rising immediately to 14.3 - the battery is apparently full, 2A load wasn't able to remove enough charge in those few seconds.
I wrote about this in the very 1st thread - this controller doesn't immediately feed the battery all the current that the load is drawing, even with a lot of "sun", i.e. DC charger. It did that with PV input, it did the same with DC charger. There was no need to feed the battery anything now that it's full, but Renogy played this trick earlier with PV when battery wasn't full, see my other thread https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/30245717.cfm.
Turned the load off - enough pushing Chinese fridge, don't want it to die on me in the bush.
Charging battery via DC charger and Renogy. This time charging stopped at 14.3 - right at the Boost voltage. Forget those High Volt Disconnect and Charge Limit set to 14.8.
At least, it stopped after 14.3, didn't try to fry it up to 15.5. Don't know how long after 14.3 it stopped, Boost timer was set to 10 minutes but it looked longer.
Display reads Float 13.9, then 13.8, 13.7. My Float is set to 13.3, this is Lithium, don't need Float. Current was zero amps at this point. This isn't Flooded, with no load it will stay forever at 13.7, should read "Full", not "Float", but its firmware is not that good. This Renogy is a wet/gel/AGM controller that you "can" make work for Lithium, with some pains.
Boost Charge Return was set to 13.8V - nope, didn't return to Boost at 13.7 even.
Turned the Load on, fridge drawing 2A, now Renogy initiates Boost at 0.6A, rising immediately to 14.3 - the battery is apparently full, 2A load wasn't able to remove enough charge in those few seconds.
I wrote about this in the very 1st thread - this controller doesn't immediately feed the battery all the current that the load is drawing, even with a lot of "sun", i.e. DC charger. It did that with PV input, it did the same with DC charger. There was no need to feed the battery anything now that it's full, but Renogy played this trick earlier with PV when battery wasn't full, see my other thread https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/30245717.cfm.
