Originally Posted by noelex 77
I agree with you about the charging. Many people with very sophisticated systems and expensive batteries have an inappropriate charging algorithm .
It would at least be nice if all the better solar controlers at least allowed the adjustment of parameters like absorption time.
I install a lot of solar, alternator, wind
, IC's & chargers. They all need proper programing to work and ideally folks need to understand how they work and how they use the boat in order to maximize absorption time charging.. Perhaps 98% of the external regulators I work on are improperly programmed and most often charging slower than simple a two stage, bulk/absorption dumb regulator
would because they go from absorption to float far to early.
I had one boat with 675Ah's running a 1 hour absorption time on his solar controller. His panel was 1.2% of the bank. With that panel he really does not even need a float stage as he should never be able to hit it unless on a mooring
for a long time. I extended his float and transition to float parameters on his IPN ProRemote and it made all the difference in the world, well, as much as you can do with 1.2% of "C".. As it was he was not hitting absorption voltage until the high 90's as a % of charge anyway. Even at that point an hour at absorption was pretty useless...
Battery chargers are the same and most don't allow any customizing, you get what you get.. You need to get into more sophisticated chargers to get the ability to program.
With the Blue Sky IPN ProRemote absorption times can be adjusted as can "transition to float". By adjusting these two parameters to fit your bank they can certainly work better and do not have what I call "premature efloatulation".
Often I will "prioritize" absorption voltages for customers so they don't drop out their highest current
source when they hit absorption voltage. I also adjust float conditions so that premature efloatulation does not occur and slow the rate of charge. Premature efloatulation is one of my biggest pet peeves but I see it over, and over and over..... Ideally you don't even want to consider a float level voltage until the bank has attained 98% SOC or better.
This programming is simple to do and only requires the source with the highest output capability to have a voltage limit 0.1V higher than the others.. This prioritizing all depends on how the customer uses the boat and how they plan to use it.
Sometimes the solar array gets priority voltage and some times an alternator or big charger run off a gen set.. Just depends upon how the customer uses the boat. It also depends upon what the bank can "accept" as it enters absorption voltage with each of the differing sources. The state of charge when the bank hits absorption voltage is entirely dependent upon the sources available current
. An alternator will hit absorption voltage on the bank far earlier, perhaps 75-85% SOC, than most solar or wind
set ups. Solar or wind alone often don't hit absorption until the mid to high 90's (amperage dependent) so the alt often takes the priority voltage, when it is running..