Charging a Battery Bank

BFL13 wrote:

Joel_T wrote:

BFL13 wrote:

Joel_T wrote:
When I get it I'll drop the batteries to 50 percent, hook up my 1800w genny, grab some beer and a book and sit close to my Trimetric monitor and...

Anyway to take a vote to get those in power to allow the percent character in posts.

Yipes, I hope that "1800w" gen will run it! Not so sure about that.

Just change over to trailerlife and forget rv.net.

He said somewhere around 13a for the 75amp charger and if I remember correctly a tad less than 15a for the 100a unit. The 1800w is continuous duty so I figure I'm OK.

Trailerlife? I'll look

Lately, when you go to trailer life it is in red instead of blue as before, but now it says "rv.net" Beyond bizarre. anyway you can use the % sign--see? :)

BTW forget the book. Set it for 3-stage first. (Never mind the ADJ mode till later.) Take notes every five minutes from start to after it starts to seriously taper amps. Note the amps, volts, and AH each five minutes. From that we can construct a charging profile where we can see at what SOC you got to before amps started to taper or when it dropped to 13.6 whichever comes first.

(The "old" ones dropped to 13.6 as soon as the batts reached near Vabs, which is way too soon for ideal fast charging.) I and I suppose others have bugged PM about that so they apparently did something--what they did remains to be seen! You are the witness. It is a big responsibility, but you are up to it. :)

Somethin aint right. Set the 75a (?) PowerMax charger at measured 14.7v and on 3 stage. Dropped batts to 49% SOC per trimetric, 11.5v (?), with specific gravity at 1.120 (which Crown says is 0% SOC ? 100% was/is 1.275). Plugged into 1800w genny (didn't lug at all) and started at 13.2v / 32.2a An hour later volts were only up to 13.7v and amps 29a Voltage increases slowed waaay down and amps started tapering faster. At the end of 2 hrs things read 13.85v / 17.1a Very disappointed and confused.