battery switch

[tarpondale]

I am installing the Renogy DCC50S following the wireing instructions laid out by Onemanvan and Kiltym in the wireing ideas for house batteries post. I removed the rooftop A/C and I want to replace the Kissling relay with a manual switch to go from alternator power or power thru the converters to the Renogy charger. Does anyone have a switch recomendation ? thanks

 

[Kiltym]

m-Series Selector 3 Position Battery Switch - Red - Blue Sea Systems

300 Amps continuous rating for outboards and small gasoline or diesel engines.

www.bluesea.com

 

[onemanvan]

You might want to check the stud size - if I remember correctly you need 5/16"
I think Perko is better quality than BEP - your choice...

https://www.amazon.com/Perko-8501DP-Marine-Battery-Selector/dp/B00144B6AE

https://www.amazon.com/gp/product/B000NI3EXY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

 

[borabora]

I would use a breaker. It serves the purpose of a switch plus fuse functionality.
But be careful as there are plenty of crappy breakers around as well. I recommend Blue Sea,, Bussman, or Tocas

https://www.amazon.com/Blue-Sea-Systems-Circuit-Breakers/dp/B005BI5466/ref=sr_1_5?dchild=1&keywords=dc+breaker+80+amp&qid=1609424549&sr=8-5

 

[Kiltym]

You might want to check the stud size - if I remember correctly you need 5/16"
I think Perko is better quality than BEP - your choice...

https://www.amazon.com/Perko-8501DP-Marine-Battery-Selector/dp/B00144B6AE

https://www.amazon.com/gp/product/B000NI3EXY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

I did have to widen the lug holes to fit the Blue Sea.... Forgot about that, but not a huge deal with a dremel.

 

[tarpondale]

thanks for the quick responses I think I wil use the Perko,,, the wire ? I've heard welding wire mentioned by some on you tube , and also the fuses? would you reccomend ANL type ? Renogy said use a 65 and a 75 amp . a source for those? thanks again

 

[Kiltym]

Keep in mind you ideally want a 3 way switch. 1, 2, and off/none.

The perko is 4 way and I am unsure the implications of All and backfeeding of DC power into the convertors from the Sprinter battery. Perhaps someone knows if this is a concern or not.

And implications of bulk charging the start battery from the convertors (which might be helpful).

 

[onemanvan]

thanks for the quick responses I think I wil use the Perko,,, the wire ? I've heard welding wire mentioned by some on you tube , and also the fuses? would you reccomend ANL type ? Renogy said use a 65 and a 75 amp . a source for those? thanks again

Ancor marine grade wire is a good choice - I used 6awg but 4awg might be the better choice...

https://www.amazon.com/gp/product/B000NUXDCE/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1&psc=1

I used a Bussman circuit breaker close to the B2B charger

Amazon.com: Bussmann CB285-70 Surface-Mount Circuit Breakers, 70 Amps (1 per pack): Automotive

Buy Bussmann CB285-70 Surface-Mount Circuit Breakers, 70 Amps (1 per pack): Circuit Breaker - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

 

[onemanvan]

Keep in mind you ideally want a 3 way switch. 1, 2, and off/none.

The perko is 4 way and I am unsure the implications of All and backfeeding of DC power into the convertors from the Sprinter battery. Perhaps someone knows if this is a concern or not.

And implications of bulk charging the start battery from the convertors (which might be helpful).

I used this BEP 4 way switch so that I could charge the starter battery via the generator/converter in case the starter battery went flat

https://www.amazon.com/gp/product/B000NI3EXY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

IMHO: It would be a poorly designed power supply that could not be safely connected to a battery...

Note:
The BEP switch can be rotated in such a way that you don't have to pass through the BOTH position when switching from BAT 1 to BAT 2
The downside is the quality of the BEP switch hasn't impressed me IE: the studs seem to get hotter than they should - poor switch contacts?
The potential downside of the Perko is you do have to pass through the BOTH position when switching from BAT 1 to BAT 2

 

[Kiltym]

Blue Sea also makes a 4-way if that is desired. Non-issue with quality, but do have to modify the terminal holes on the existing wires.

 

[tarpondale]

I went with the Perko 8501 switch , I plan to connect the wire from the converters to the one position on switch and the wire from the sprinter battery to the 2 position and ignore the both position or at least pass thru the both position when not plugged in to shore power or when sprinter running. I picture the switch to be designed for wire from the Dcc50s to be connected to a switch terminal that when switch is on pos. one I'm connected to the converters and when on pos.2 I'm connected to the sprinter battery. am I on track ?

 

[onemanvan]

Most questions related to this topic have already been answered in this thread:

Wiring idea for charging house batteries

Why couldn't new switch just be on new wire (move new switch on schematic an inch over to right so nothing between K52 and DC-DC charger? Switch (on/off type, not a choose power source switch) would be at end of the new wire only, right before the DC-DC charger. So whenever engine is on, there...

sprinter-source.com

Details of wiring are always best expressed in schematic form: