Renogy DC-DC Charger UPDATE 2 Test
Update--fixed the problem below--you can skip to 4:06 pm post. Update 2- 28 Feb. My 20 amper is on, it has the green light and no red light. But it is cycling up and down for amps constantly, mak...
Forum Discussion
Good to hear you got it fixed,
Sounds like the charging outputs solar and DC to DC converter, were somehow in series instead of parallel
Many solar controllers are positive connections (input-panels, output charge) are common ( connected together) on the controller and it is the negative connections input and output that are isolated separately, (charging control flow is thru the negative side, not positive side ! Of the solar controller, this is opposite of vehicle wiring we are used to
This might be why you had a problem, the DC to dc charger AKA voltage booster, is wired positives Isolated and negatives common, like vehicles
Thinking all the negatives would be common and at zero volts, you ended up wit two devices in series for double voltage, until you moved negatives around and took one off the Trimetric shunt and broke the series circuit between the two charge systems, Renogy and alternator in series, instead of Renogy replacing the alternator, an inline boost operation for DC, like an autoformer does for 120vac
That's my analysis based on your description, and first hand experience with a solar controller that was mfg input output positive connections common, negative connections separated/isolated, charge controlled by the negative
Since charge current into a battery has to travel thru both wires electrically , the control can be thru either side of the circuit, and since the charger is not in the load circuit there is no problem, the material design type of the power control devices determine whether it's positive control or negative control germanium, Silicon , npn pnp, etc.. Engineer's choice or budget been counter, or maybe what the purchasing dept knows they can get, and tells the engineer, we can't the ones you want, redesign this device, we can get from our main supplier, we can't source your choice at the profit we want to make, or in the number we want to manufacture
Any way that's my thoughts on what happened on your first try, you were able to correct it , and tells us about it
Sounds like the charging outputs solar and DC to DC converter, were somehow in series instead of parallel
Many solar controllers are positive connections (input-panels, output charge) are common ( connected together) on the controller and it is the negative connections input and output that are isolated separately, (charging control flow is thru the negative side, not positive side ! Of the solar controller, this is opposite of vehicle wiring we are used to
This might be why you had a problem, the DC to dc charger AKA voltage booster, is wired positives Isolated and negatives common, like vehicles
Thinking all the negatives would be common and at zero volts, you ended up wit two devices in series for double voltage, until you moved negatives around and took one off the Trimetric shunt and broke the series circuit between the two charge systems, Renogy and alternator in series, instead of Renogy replacing the alternator, an inline boost operation for DC, like an autoformer does for 120vac
That's my analysis based on your description, and first hand experience with a solar controller that was mfg input output positive connections common, negative connections separated/isolated, charge controlled by the negative
Since charge current into a battery has to travel thru both wires electrically , the control can be thru either side of the circuit, and since the charger is not in the load circuit there is no problem, the material design type of the power control devices determine whether it's positive control or negative control germanium, Silicon , npn pnp, etc.. Engineer's choice or budget been counter, or maybe what the purchasing dept knows they can get, and tells the engineer, we can't the ones you want, redesign this device, we can get from our main supplier, we can't source your choice at the profit we want to make, or in the number we want to manufacture
Any way that's my thoughts on what happened on your first try, you were able to correct it , and tells us about it
