I'm going to say, that your 2 panels in parallel, will not, at 28V, be enough to properly charge a battery. If they were 35Vvmp, that would be different. If you wired in series and used a MPPT controller, that would work, but you are not.
But onto the sketch you posted:
You only need a single 25A breaker, on the + lead to the PV panels. You show 2, 9A panels in parallel, which gives 18A, and your 15A breaker will pop
The chances of the PV breaker actually tripping are slim, but it makes a very handy switch point, use a switch rated, DC breaker from Midnight:
The battery, I like to recommend the Blue Seas dual MRBF fuse
BUT WAIT. You are series / paralleling 12V batteries to end up with 24V 400ah. That means you need 30-40A to properly charge the batteries, and you don't even have 20A from your PV
The output of the controller to the battery, would go to a 50A fuse (or Breaker) to the battery
The battery also needs protection with a series fuse on EACH battery (if you insist on paralleling)
What are your loads ? Do you need 400ah ? What about using 4, 6V 200ah golf cart batteries in series, that gives you 24V @ 200ah and no parallel battery mess
But onto the sketch you posted:
You only need a single 25A breaker, on the + lead to the PV panels. You show 2, 9A panels in parallel, which gives 18A, and your 15A breaker will pop
The chances of the PV breaker actually tripping are slim, but it makes a very handy switch point, use a switch rated, DC breaker from Midnight:
The battery, I like to recommend the Blue Seas dual MRBF fuse
BUT WAIT. You are series / paralleling 12V batteries to end up with 24V 400ah. That means you need 30-40A to properly charge the batteries, and you don't even have 20A from your PV
The output of the controller to the battery, would go to a 50A fuse (or Breaker) to the battery
The battery also needs protection with a series fuse on EACH battery (if you insist on paralleling)
What are your loads ? Do you need 400ah ? What about using 4, 6V 200ah golf cart batteries in series, that gives you 24V @ 200ah and no parallel battery mess
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