Trojan T-1275 Trouble
Newbie here. I have a travel trailer that has a Trojan T-1275 battery that is around three years old. The camper spends most of it's time in a pole barn hooked up to a couple of 100 watt solar pan...
Forum Discussion
Yes it is sort of complicated till you do it in real life. Switch A makes it a typical three stage converter and if you monkey with the pot with the switch set to the left, it will change all three voltages at once. You can restore that to original though.
The real benefit is as a singe voltage manual charger with switch A to the right, set to any voltage you like with the pot B.
This means you can set it to say 14.8 and leave it there till the battery is charged, then drop that voltage to 13.6 or whatever float voltage you want and leave it there. Or when the batts are done at 14.8 just switch A back to the left and it will be in three stage and do that float voltage.
You can equalize by first charging the batts at 14.8 till full, then crank the voltage up to 16.2 and do your equalize, then crank the voltage back to whatever.
It is a pain to use a little screw driver in that hole B to change the voltage, but you don't have to do it often. I much prefer the model with the pot knob on top you can just dial around, but those models cost way more for the privilege.
You really need a voltmeter you can see while operating this thing and an ammeter too if you are trying to tell when your AGMs are down to accepting 0.5a per 100AH of battery after charging at that chosen single voltage using pot B that matches your AGM battery specs for charging. I have my Trimetric for that. You can get by with other meters though.
It is no worse operating an LK like those than setting voltages with an inverter/charger that has fancy options. the big thing is that you can match your charging to the specs of any battery you might have and they vary a lot. Even AGMs have all different levels of charging voltages.
The real benefit is as a singe voltage manual charger with switch A to the right, set to any voltage you like with the pot B.
This means you can set it to say 14.8 and leave it there till the battery is charged, then drop that voltage to 13.6 or whatever float voltage you want and leave it there. Or when the batts are done at 14.8 just switch A back to the left and it will be in three stage and do that float voltage.
You can equalize by first charging the batts at 14.8 till full, then crank the voltage up to 16.2 and do your equalize, then crank the voltage back to whatever.
It is a pain to use a little screw driver in that hole B to change the voltage, but you don't have to do it often. I much prefer the model with the pot knob on top you can just dial around, but those models cost way more for the privilege.
You really need a voltmeter you can see while operating this thing and an ammeter too if you are trying to tell when your AGMs are down to accepting 0.5a per 100AH of battery after charging at that chosen single voltage using pot B that matches your AGM battery specs for charging. I have my Trimetric for that. You can get by with other meters though.
It is no worse operating an LK like those than setting voltages with an inverter/charger that has fancy options. the big thing is that you can match your charging to the specs of any battery you might have and they vary a lot. Even AGMs have all different levels of charging voltages.
