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Old 07-05-2023, 08:49 PM   #1
Skoolie
 
Join Date: Jul 2015
Location: New Hampshire
Posts: 218
Year: 2001
Coachwork: Thomas
Chassis: MVP ER
Engine: Cat 3126b 210 HP 605 ftlbs
Low voltage cutoof from alternator to house

I want to use the alternator to charge the house battery bank when driving and power the inverter for minisplits and other ac loads. So I have a solenoid to allow the house dc system to connect to the alternator using a low voltage cutoff controller board. What should the low voltage cutoff be set at to ensure the coach batteries are fully charged before delivering energy to the house side?



Inverter is 2800W,
Alternator is 200A

House bank size- 12v @ 1000AH
Coach is 12v 2x group 31

ism minerals is offline   Reply With Quote
Old 07-06-2023, 12:18 AM   #2
Bus Crazy
 
Join Date: Oct 2020
Location: Near Flagstaff AZ
Posts: 1,951
Year: 1974
Coachwork: Crown
Chassis: "Atomic"
Engine: DD 8V71
Before getting to that voltage cutoff question...

What kind of house batteries do you have? Are they lead-acid or lithium? I ask, because if they're lithium you'll want to use a DC>DC charger instead of a direct solenoid connection.
rossvtaylor is offline   Reply With Quote
Old 07-06-2023, 06:33 AM   #3
Skoolie
 
Join Date: Jul 2015
Location: New Hampshire
Posts: 218
Year: 2001
Coachwork: Thomas
Chassis: MVP ER
Engine: Cat 3126b 210 HP 605 ftlbs
They are lead acid AGM type.
ism minerals is offline   Reply With Quote
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