Search found 5 matches

by FrankB
Thu Aug 03, 2017 1:13 pm
Forum: FLEXmax Charge Controllers
Topic: Newbie with FM80 programming questions
Replies: 9
Views: 5919

Re: Newbie with FM80 programming questions

larrywa: If your fridge, and other equipment loads, are being drawn while the charging cycle is happening, those currents are not going into the batteries. As I thought. It is for this reason that the timer is the only limit on the absorb stage at the moment, as the draw never reaches the zero amp t...
by FrankB
Tue Jul 18, 2017 12:31 pm
Forum: FLEXmax Charge Controllers
Topic: Newbie with FM80 programming questions
Replies: 9
Views: 5919

Re: Newbie with FM80 programming questions

LarryWA: Thank you for the input. I have no temperature sensor on the batteries, and retrofitting one could be an awful wiring job, so the machine is 'guessing' the charge points. Do I understand correctly that I can program the 'end amps' for the absorb stage? I would think that if I increase that ...
by FrankB
Mon Jul 17, 2017 1:59 pm
Forum: FLEXmax Charge Controllers
Topic: Newbie with FM80 programming questions
Replies: 9
Views: 5919

Re: Newbie with FM80 programming questions

petertearai: Thank you for your input. Yes, 15.3 was WAY too high for absorb. After a couple of days, the batteries were gassing heavily, so I set everything back to default (and refilled the batteries with distilled water). sulphsted battrtys will quickly get to absorb quickly This is quite likely ...
by FrankB
Thu Jul 13, 2017 4:14 pm
Forum: FLEXmax Charge Controllers
Topic: Newbie with FM80 programming questions
Replies: 9
Views: 5919

Re: Newbie with FM80 programming questions

OK, I may have found the answer by poking around on the web. It appears that the absorb voltage needs to go up from the default 14.4 volts to closer to 15.3 volts for the majority of gc2 batteries on the market. IIUC, when the controller hits the absorb voltage, it drops to absorb mode for 1 hour, t...
by FrankB
Thu Jul 13, 2017 1:25 pm
Forum: FLEXmax Charge Controllers
Topic: Newbie with FM80 programming questions
Replies: 9
Views: 5919

Newbie with FM80 programming questions

Just installed 6 x 205 watt Solartec 72 cell panels on the roof of our RV. Voc is 45. Vmpp is 39. All panels are wired parallel with #12 solid to a combiner box, and with #8 over the remaining 20 feet to the solar controller. Battery bank is 6 x GC2 flooded cell batteries from NAPA that are about a ...