Blue Sea 7610 dual battery relay question

[telford dorr]

This is what I meant:

_________________
'71 panel, now with FI
'Experience' is the ability to recognize a mistake when you're making it again - Franklin P. Jones
In theory, theory works in practice; in practice, it doesn't - William T. Harbaugh
When you're dead, you don't know you're dead. The pain is only felt by others.
Same thing happens when you're stupid. - Philippe Geluck
More VW electrical at http://telforddorr.com/ (available 9am to 9pm PST)

[lmaoufle]

quick question for the guru out there, my main battery is a 55ah my aux a 110 and i am using this blue sea montage. My main is dying so I need to replace it, should I go for a new one that it is closer to the 110? like an 80 or 90 or, can I use a 55ah? I know that sometimes you should use kind of same battery power, but I don't know if the blue sea is impacted by this rule?


thks !

[telford dorr]

Because of the way the Blue Sea unit works, it shouldn't make any difference, as the starting battery is charged before the house battery. It would probably be good to have both batteries of the same type (wet cell, AGM, etc.) so that their full charge voltages are similar, but this may not be critical.
_________________
'71 panel, now with FI
'Experience' is the ability to recognize a mistake when you're making it again - Franklin P. Jones
In theory, theory works in practice; in practice, it doesn't - William T. Harbaugh
When you're dead, you don't know you're dead. The pain is only felt by others.
Same thing happens when you're stupid. - Philippe Geluck
More VW electrical at http://telforddorr.com/ (available 9am to 9pm PST)

[SmokerF15]

Hello,
I probably missed it somewhere buried in this post. What gauge wire is being used with the Blue Sea Systems (add-a battery) set up? I'm assuming 2 AWG?? I'm considering this mod and measured @ 7' of cable to reach from battery to batter across the engine compartment. Any reason to be concerned about voltage drop etc. if I use 2 AWG?

Thanks for the help
Smoker F15

[BUSBOSS]

4 gauge is plenty.
_________________
All the redemption I can offer, girl, is beneath this dirty hood
1976 Westfalia
1970 Karmann Ghia Convertible (sold - but not forgotten)

[lintbrush]

I used the following. Probably overkill, but have had zero problems.

[sodbuster]

I need to get new pics of this. I installed a status pannel in my engine compartment for my Blue Sea ACR. I don't recall the exact model but the instructions had a schematic that requires every connection to the ACR be fused.

I also wired in the start intrupt and remote LED features with mine. (both fused.) I also installed on the panel what I call a "storage switch." It's just an sealed aircraft grade toggle switch wired inline on the ground wire. if the bus has to sit for a long period I open the switch and the ACR is competely disabled. I made a bracket that mounts my ACR in the location of the old voltage regulator so it is well hidden behind the stock air cleaner. This is why I installed an LED on the status pannel. The LED on the ACR cannot be seen by just opening the rear deck lid.

Like I said I need to take new pics. All the pics I have show the system with the old constant duty solinoid.

[SmokerF15]

Thanks all for the replies. The schematic, size wire, and fuses seem straight forward.

I was also wondering about the Blue Sea "Add-a-battery" PN 7650, vs the Blue Sea "Automatic Battery Separator for Aux Batteries" PN 7622. I am installing a Mastervolt Inverter/charger on the Aux battery side. Is the 7622 better suited for this application? I would like to charge the Aux battery and the starter battery with either the Alternator (bus running) or AC Shore power through the charging feature of the inverter (bus not running but AC power available).

Thanks Again
SmokerF15

[Koeppler]

[aeromech]

[hutmo]

I have a 78 Westy and I am installing a Blue Seas Battery switch and ACR. I plan on mounting the ACR on the wall between the engine and the gas tank using self tapping screws. The switch and the fuses will be mounted on plexiglass on the side of the battery.

QUESTION
How much space is there between the firewall panel and the tank? I have seen it posted somewhere but for the life of me I cannot find it.


Thank you for your help

Chris
_________________
1978 Westfalia Champagne
2.0 Fuel Injected

1946 Packard Seven Passenger Sedan

What if the Hokey Pokey really is what it is all about?

Samba Member #1115
Joined Feb 6, 2002

[aeromech]

Maybe two inches but I think just using sheet metal screws is a bad idea and they’ll pull out. I’d use rivnuts
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[hutmo]

Rivet nuts... good idea

Chris
_________________
1978 Westfalia Champagne
2.0 Fuel Injected

1946 Packard Seven Passenger Sedan

What if the Hokey Pokey really is what it is all about?

Samba Member #1115
Joined Feb 6, 2002

[hutmo]

QUESTION....

Where should the 100 AMP fuses be placed as to the location of the ACR?

I am using 2 gauge wire.

As close to the battery as possible or can they be placed closer to the ACR?

I ask because I am considering mounting the ACR, the Blue Seas Switch and the 100 amp fuses on the firewall. With RIV nuts as has been recommended.

This way, the firewall can be replaced if there is a desire in the future and there would be no additional holes placed in the car.

Thanks
Chris
_________________
1978 Westfalia Champagne
2.0 Fuel Injected

1946 Packard Seven Passenger Sedan

What if the Hokey Pokey really is what it is all about?

Samba Member #1115
Joined Feb 6, 2002

[aeromech]

Courtesy of Telford Dorr

The fuses can be located anywhere between the Battery + and the ACR.

I used 80 amp

I like to put the switch here because it's easy to reach. If you were unfortunate enough to have an engine electrical fire like someone here did recently, you might not want to reach across the burning wires to turn off the batteries.

_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[mikedjames]

[aeromech]

Hey Mike,
Let’s see pics of your aux battery installation and also your electrical engineering degree. Sometimes when making a drawing it isn’t easy to be specific on locations. That said, you’re full of shit
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[telford dorr]