Quote:
Originally Posted by 4Mrfisherman!
Thank you for asking
The Air Conditioner is the only thing on that circuit.
The system is built with 3 100ah batteries parallel. It has 900 watts of solar on top. It has 2/0 600 amp welding cables for battery to inverter leads.It has a victron 50 amp solar charger controller.
When I removed the prep cover for this additional system the rolmax was a single continues wire. I now realize it is because it needs to be a pass through situation. When there's shore power it works and when we're not hooked up to shore power the inverter is used to power that circuit.
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My comment on the other loads was in regard to all of the power loads in the camper, 12v DC or 120v AC. When not connected to shore power, 100% of your power is coming from the batteries either as a 12v DC draw, or 120v AC through the inverters. All of those loads combined will need to be considered in how much power the system will consume and how long you can realistically expect to keep the lights on.
300ah of battery and 900w of solar will still only get you so far. One cloudy day using the AC on the inverter and your system will not generate enough power to recharge the batteries. Two cloudy days and you may not have enough to run the jacks or move the slides if you want to leave. Three cloudy days and you may not have enough to keep the lights on or the refrigerator operating. The fact is that even with that setup, you are drawing more power from the system than the system can generate, so you will deplete the batteries. This is why you need to include a generator in this equation. The solar panels do not output 900w of energy, even under "perfect" conditions (which seldom if ever exist in the real world). Remember that panel ratings are determined in a tightly controlled testing environment that is impossible to replicate out in the field.
All that aside, to answer your question regarding the AC inverter loop prep; yes, that 12ga loop of Romex feeds the rooftop AC unit. With all power disconnected, you cut that loop and then re-energize the circuit and note which end of the loop is the line (supply) and which is the load. Turn the power back off. The line end goes to the inverter "in" and the load end goes to the inverter "out". Lastly, as noted previously, you also still need a soft-start on the rooftop AC unit.