Originally Posted by Neptune's Gear
The diode splitters are older tech, sure. They have been available for years and are proven.
I have no problem using the newer VSR systems either, preferably the mosfet based units.
I just wanted to point out that on some installs, a diode splitter is fine if properly configured. Properly configured means the output of the splitter is the correct charging
voltage for the batteries being used. Voltage should always be sensed at the batts, to get the most accurate reading.
Therefore diode splitters are not necessarily junk, as some posts here would indicate.
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If a diode splitter drops .6V at minimal current
(the start battery) and approx 1.1V at full rated current
(I've physically measured this on diode isolators) when charging the house bank and then we have wire voltage drop, what is the voltage at the start battery
while the house is taking high current? Can they work? Sure. Would I ever install one today with the myriad of excellent options we have, probably not..
The other issue with diode splitters, that is rarely talked about, is there is no voltage on the input stud when idle making them a no-go for directing solar
or other charging sources to multiple banks because the controllers need to see a safe turn on voltage. Most controllers and chargers also do not have voltage sense leads.
Even isolator models with a trigger stud only want it used for "key on" excite thus negating the diode isolator for charging multiple banks from all charge sources. They really only work for alternator
charging, if you have remote
sense, and the reg will kick in without seeing a trigger voltage. Today boats have multiple charging sources so a unit that works across all charge sources is usually best suited.