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--- electrical:12v:alternator_details [2022/05/20 23:16]
frater_secessus [common types of alternator]
+++ electrical:12v:alternator_details [2022/05/20 23:39]
frater_secessus [DUVAC]
@@ Line 62: / Line 62: @@
 HD alternators for any particular vehicle are typically bolt-in with no modifications required.  They do cost somewhat more.   The labor cost would remain the same so some people choose to upgrade the alternator when/if the OEM one fails.
-Some older RVs come with DUVAC (DUal Voltage Alternator Control)((https://www.countrycoachforums.com/index.php?PHPSESSID=3ggkjl41c5lrkrerduih87oeif&topic=6840.msg34665#msg34665)) setups, which use separate voltage-sense wires for the house bank. {As far as I can tell this was a workaround from when many isolators were diode-based so the alternator could not "see" aux battery voltage on the combined circuit -- secessus}  See [[https://www.dixie-electric.com/tsb/TSB_704.pdf|this TSB]]. (PDF)
+===== DUVAC =====
+Some older Class A and C RVs came with DUVAC (DUal Voltage Alternator Control)((https://www.countrycoachforums.com/index.php?PHPSESSID=3ggkjl41c5lrkrerduih87oeif&topic=6840.msg34665#msg34665)) setups, which use separate voltage-sensnig wires for the house bank.
+> This Duvac system that Leese Neville came up with was a completely integrated dual battery/isolator setup that was “state-of-the-art” in ’99((diode-based isolators)) but soon was obsoleted by newer better technology.((voltage-sensing relays and DC_DC chargers))((https://www.foreforums.com/index.php?PHPSESSID=bs0n0psbr6rrvd240rv4ijvg1p&topic=33250.msg432529#msg432529))
+> ...the primary reason for DUVAC is to allow the alternator to "compensate" for the voltage loss (turned into heat) in the old generation **diode-based battery isolators**. There is approximately a .7 VDC loss through the battery isolator. The sense wire/terminal allows voltage on the battery side of the isolator to control the alternator voltage.((https://www.irv2.com/forums/f115/eliminating-the-duvac-system-539048.html#post5772417))
+{As far as I can tell this was a workaround from when many isolators were diode-based so the alternator could not "see" aux battery voltage on the combined circuit((https://www.foreforums.com/index.php?PHPSESSID=bs0n0psbr6rrvd240rv4ijvg1p&topic=33250.msg300875#msg300875)) -- secessus}  See [[https://www.dixie-electric.com/tsb/TSB_704.pdf|this TSB]]. (PDF)

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