Thank you for your time in advance, Setup is for an Electric van with a fridge unit, with PV power to top up batteries.
- 2 x 115W PV panels in series (40A inline fuse) after MPPT before DC BUS
- 1 x MPPT 100/30
(both those elements wired to bus bar) 150A
Connected to Bus bar is
1 x Fridge unit, which draws 50/70amps when under load, with built in 100A / 12V charger system, to charge batteries. Fused at 125A as shown.
1 x Smart Shunt (all negative loads pass through)
2 x212AH 12V Lithium batteries in parallel
- When the 12V charger (rated to 100A) charges the batteries, the charging current is flowing through the whole circuit. What stops the 40A fuse on the + line of the MPPT not blowing, or will it blow ? as current passes through the MPPT as it will happily give voltage of the battery etc.
What can I do, is there a risk of 'back current' or similar, as I am worried, that when I will blow the fuse before the MPPT when I turn the charger on.
I have done a similar setup before where I have not fused the MPPT, but I understand its best practise to do so.