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...
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Update--cleaned up the installation, and tested it again--works a little better now. Batts full but ran MW on inverter to bring voltage down so the charger would see the need to do Bulk stage. Turned on truck engine idling, and turned on charger:
(Before test--DC input on, not connected to house batts, output voltage showed 14.7 briefly, then 13.5)
Input- truck 14.6v, input DC 11.7v
Output- DC 12.5v, Trimetric on batts 12.3-12.4v, 20 amps
after 10 minutes-
Turned off MW, letting charger bring up battery voltage-
Input- truck 14.3v, input DC 10.9v (getting warmer?)
Output- DC 14.63v, Trimetric 14.5v, 20 amps
went into Absorption Stage
Input- truck 14.22v, input 12.09v
Output- DC 14.64v, Trimetric 14.6v, 10.5 amps tapering.
I used a household light switch on the "ignition wire"--very handy to be able to switch the unit off and on. Unit is mounted on the inside of the closet on a side wall (house batts below the closet floor) so the output side is facing out and you can see the green light (and red light-hope not) Solar controller also in there on a wall. If it gets too warm, will leave closet door ajar.
On the input, I by-passed the 7-pin connectors for the charge wire and it did help with the voltage but only a little. It works so no need to do more AFAIK.
(Before test--DC input on, not connected to house batts, output voltage showed 14.7 briefly, then 13.5)
Input- truck 14.6v, input DC 11.7v
Output- DC 12.5v, Trimetric on batts 12.3-12.4v, 20 amps
after 10 minutes-
Turned off MW, letting charger bring up battery voltage-
Input- truck 14.3v, input DC 10.9v (getting warmer?)
Output- DC 14.63v, Trimetric 14.5v, 20 amps
went into Absorption Stage
Input- truck 14.22v, input 12.09v
Output- DC 14.64v, Trimetric 14.6v, 10.5 amps tapering.
I used a household light switch on the "ignition wire"--very handy to be able to switch the unit off and on. Unit is mounted on the inside of the closet on a side wall (house batts below the closet floor) so the output side is facing out and you can see the green light (and red light-hope not) Solar controller also in there on a wall. If it gets too warm, will leave closet door ajar.
On the input, I by-passed the 7-pin connectors for the charge wire and it did help with the voltage but only a little. It works so no need to do more AFAIK.
