Will's DIY Solar Blueprint 400 watt Solar Package w/ alt charging circuit breaker question

Liamof

New Member
Joined
Jun 5, 2022
Messages
2
I am following Will's DIY Solar Package using the Renogy DC-DC charger with MPPT.
Will shows using a 80 amp circuit breaker between alternator and charger and 70 amp between house battery and charger.
For the 50 amp charger Renogy requires a 75 watt circuit breaker between the alternator and charger and a 65 watt circuit breaker between the charger and the house battery. Will's circuit breaker is slightly higher than Renogy minimum requirement so I need some advice.
Just want to make sure I am ok using Will's diagram, don't want to fry my charger.
Otherwise the diagram is very easy to follow and a big help.
My system is a 180 solar panel, 100 ah lithium battery with no inverter, powering a refrigerator and lights, so its a lot smaller.
Thanks,
Liam
 

rmaddy

Full-time Solar-powered Trailer Life
Joined
Nov 16, 2019
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3,735
Location
USA
The fuses and breakers are there to protect the wires, not the devices. As long as the fuse/breaker sizes you choose are appropriate for the wires you will be using then being 5A higher won't make any difference.
 

Liamof

New Member
Joined
Jun 5, 2022
Messages
2
The fuses and breakers are there to protect the wires, not the devices. As long as the fuse/breaker sizes you choose are appropriate for the wires you will be using then being 5A higher won't make any difference.
Im using 4 gauge wire so it seems I can go with Will's recommendation of using 80amp and 70amp circuit breaker.
Thanks for your help.
Liam
 
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