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05-08-2017, 10:41 AM
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#1
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Senior Member
City: Long Beach
Vessel Model: '81 CHB34
Join Date: May 2014
Posts: 107
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AC Charger + alternator
What happens if I run the AC charger (via generator) at the time as the main engine alternator? Both of which would be connected to the same battery banks.
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05-08-2017, 11:36 AM
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#2
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Guru
City: Brookline, NH
Vessel Name: Shalloway
Vessel Model: Defever 44, twin Perkins
Join Date: Sep 2013
Posts: 2,260
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Quote:
Originally Posted by winty
What happens if I run the AC charger (via generator) at the time as the main engine alternator? Both of which would be connected to the same battery banks.
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Generally, except when the batteries are very low, whichever has the higher voltage output will do most of the work. Nothing will blow up.
Ken
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05-08-2017, 01:15 PM
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#3
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Guru
Join Date: Oct 2007
Posts: 22,553
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Nothing is gained , unless the batts are on different strings so the alt sees one batch and the charger the other.
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05-08-2017, 01:24 PM
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#4
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Guru
City: Cape May, NJ
Vessel Name: Irish Lady
Vessel Model: Monk 36
Join Date: Dec 2007
Posts: 4,966
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Depends on the settings of the alternator VR and AC charger. If its just a run of the mill engine alternator, it will drive the voltage up to around 14.5 volts. The A/C charger will drop down to standby.
__________________
Archie
Irish Lady
1984 Monk 36 Hull #46
Currently in Cape May, NJ
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05-08-2017, 01:37 PM
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#5
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Senior Member
City: Toronto
Join Date: Nov 2015
Posts: 271
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Quote:
Originally Posted by High Wire
Depends on the settings of the alternator VR and AC charger. If its just a run of the mill engine alternator, it will drive the voltage up to around 14.5 volts. The A/C charger will drop down to standby.
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The more common scenario would be having the solar panels connected & charging while motoring ( I think ) As stated, depending on the settings, one or both will drop down - off.
fb
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05-08-2017, 01:40 PM
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#6
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Senior Member
City: Long Beach
Vessel Model: '81 CHB34
Join Date: May 2014
Posts: 107
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Thanks for the replies, "nothing will blow up" is exactly what I wanted to see.
My generator battery is charged by the AC charger, no stater or other means of DC power on the plant. If I need AC when underway, I need to keep the AC charger active to supply DC for the generator battery. But that means the AC charger is also feeding the other banks. Wanted to make sure I'm not damaging the other banks or alternator having both active occasionally.
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05-08-2017, 04:35 PM
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#7
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Scraping Paint
City: CT
Join Date: Mar 2017
Posts: 963
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Depending on the "intelligence" of the charge sources, it IS possible you will parallel doubled-high-amps on the circuit.
This won't IMO harm the batteries, but do make sure the wiring infrastructure, connections, fuses etc can handle the maximum Total current + some headroom margin safely.
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05-09-2017, 06:33 AM
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#8
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Guru
City: Warwick, RI
Vessel Name: Susan Helena
Vessel Model: Albin40
Join Date: Oct 2014
Posts: 523
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Also you have the option of an automatic battery combiner that will send charging current to the generator battery when the engine battery is being charged by the engine alternator. Eliminates the need for the ac charger while underway.
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05-09-2017, 06:47 AM
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#9
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Guru
City: Annapolis
Vessel Name: Ranger
Vessel Model: 58' Sedan Bridge
Join Date: Aug 2013
Posts: 7,088
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Quote:
Originally Posted by winty
My generator battery is charged by the AC charger, no stater or other means of DC power on the plant.
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No alternator on the generator engine?
-Chris
__________________
Chesapeake Bay, USA
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05-09-2017, 07:48 AM
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#10
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Guru
City: gulf coast
Join Date: Jun 2014
Posts: 3,440
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Multiple charging sources will in some way share the load. Not equally but in reltion to their regulator settings. They will not put out double the current except under exceptional circumstances as batteries have a charge acceptance rate that will limit current into the battery regardless of the capacity of the chargers.
Yes, nothing will blow up. It is common for people to run engines and generator with the inverter left on all the time.
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05-09-2017, 08:18 AM
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#11
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Guru
City: Seaford Va on Poquoson River, VA
Vessel Name: Old Glory
Vessel Model: 1970 Egg Harbor 37 extended salon model
Join Date: Jan 2016
Posts: 2,264
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I have an old Raritan charger-converter. When the engine ignition is turned on, a sense wire from the old charger turns off the charger output. So when engine is running, charger output is off and engine alternator charges the battery. Raritan charger has 2 sense wires so monitors 2 engines ignition power. But I think if one engine is running it turns itself off to all 3 of its DC charging banks.
If the battery volts drops too low on a start, DC output come on to give starting boost.
It is just an electronic transistor circuit switch in the charger that turns on or off at a preset voltage bias.
Charger circuit designers must have decided such a circuit is not needed as all the other posters don't mention one in their chargers.
A charger -converter concept is no battery power is used when charger-converter is plugged into AC power. All it does is charge the batteries and powers house loads. Of course if I turn on the Inverter and run a big load, the charger-converter wont keep up the volts on its own, so battery power is used.
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