I've been loving learning about off-grid PV system design, haven't been this interested in a hobby in a long time!
The goal of this system is to learn about electrical systems and to hopefully have a functioning source of power to run a refrigerator/freezer in the case of an extended grid power outage.
I welcome any general comments on the attached system diagram. The areas that still have me scratching my head are:
The goal of this system is to learn about electrical systems and to hopefully have a functioning source of power to run a refrigerator/freezer in the case of an extended grid power outage.
I welcome any general comments on the attached system diagram. The areas that still have me scratching my head are:
- Sizing of conductors: Watching WIll's videos, it seems I need 2 gauge wire from the battery to the inverter and MPPT. However, when I put it in a wire sizing calculator I get 6 gauge for 4 feet at 1.5% loss. Am I missing something or is will just being conservative since he is talking to a large audience?
- Circuit breakers: I think that circuit breakers in a system like mine a largely used just for isolating parts of the system for convenience/safety, is that accurate?
- Circuit breakers/fuses: are circuit breakers and fuses interchangable from a safety standpoint in system like mine?
- Current in the circuit: This question is kind of challenging to word, but do the positive and negative conductors in between the charge controller, battery, and inverter all have the same current and voltage at all times since they are all tied to the same bus bars? There is 30A max coming from the MPPT, however there is 250A max going to the inverter. Does that 250A just basically go past the leg going to the MPPT?