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BretS

Solar Enthusiast
Joined
Mar 30, 2021
Messages
162
Is it also fed from your vehicle 7-pin?

That’s the start of issue
Do what works for you if you deem it safe

I prefer separate brake systems when we put high power batteries and SCCs into our RVs
No, power from the 7 pin is useless... it is disconnected. I have a 30A DC-DC charger with 6 AWG wire from the truck. It only allows power to go one direction and charge my bank when driving.
 

shadowsteve

Solar Enthusiast
Joined
Feb 11, 2021
Messages
193
No, power from the 7 pin is useless... it is disconnected. I have a 30A DC-DC charger with 6 AWG wire from the truck. It only allows power to go one direction and charge my bank when driving.
I'm assuming he's referring to the 7pin feed from the truck brake controller. The +12v feed from the 7pin has no bearing on the brake system and for LFP/solar installs can be disconnected.

The current drawn by an engaged breakaway system is the same regardless of where the power comes from (truck, FLA or LFP) and is only changed by the voltage on the circuit. It's about 3.5A or so per brake drum. It needs to be available for 15min so you need about 2Ah/axle to meet DOT requirements.
 

EricR

New Member
Joined
Aug 8, 2021
Messages
36
Here is what I installed. It's a small breakaway battery and case, with press-to-test feature. @smoothJoey convinced me a separate battery for the breakaway system was worth while and at $13 (as of 10/06/20210) this one is pretty much a no brainer!


Note: for $13 you use your existing breakaway switch and find your own mounting screws.
 
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