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diy solar

Do I need to account for bi directional current in fuse/wire size?

SoakedUp

Solar Enthusiast
Joined
Apr 3, 2022
Messages
260
If the max continuous output current for my battery is 100amps and I have a 40amp SCC. Does the main fuse at the battery need to account for 140amps? Or is the current not cumulative like that?

Do I need to size the cable from battery to bus bar to handle 140 amps also?

I have one SOK 206ah battery max continuous output 100amps which will feed to a victron lynx distributor.

On the lynx I will have a renogy 40 amp charge controller and a Victron 12/1200 Phoenix inverter with their own mega fuses in the lynx distributor. I was going to place a 125amp mrfb blue sea terminal fuse on the SOK terminal but then started wondering if it needs to be larger due to the 40amps coming in from the charge controller.

Does the current cancel out or is it cumulative in both directions?
 
Sorry, never mind. It’s late. I realized the current produced from the SCC will divert directly to the inverter and not necessarily always feed into the battery.
 
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