Bought inverter without battery charger. So do I need auto transfer switch for 30a shore power? no generator

Casper8572 · Apr 25, 2023

Missed deadline to return 3000w pure sine inverter, so I’m committed to using it. Do I need auto transfer switch to charge my batteries when connected to 30a shore power? 2nd: Where do I connect the 10/3 wire from 30a shore power? (directly to 120v AC panel or to transfer switch? (I currently have inverter wired to 120v AC panel). I plan on dry camping 90% of the time & relying on DC/DC charger & solar for recharging. I also need help choosing a battery charger. If budget wasn’t tight I’d get a Multiplus which has everything built-in.

rodrick · Apr 25, 2023

You could just bring power to the charger only and run off your system while charging batteries from shore power not as efficient but no switch needed

timselectric · Apr 25, 2023

EG4 Chargeverter is a perfect solution for you.
It will work with whatever power source is available.
120/230/240

HRTKD · Apr 25, 2023

I assume this is in an RV. Is the Renogy inverter tied into the RV's main distribution panel?

If you are at a campground and want to use power from the pedestal to run the air conditioner, an Automatic Transfer Switch will come in handy. However, it looks like you're running 12 volt power directly to the air conditioner so it probably doesn't run off of AC. In that case, I would do like rodrick said and wire the charger directly to the shore power.

Casper8572 · Apr 25, 2023

Yes it’s an RV, and yes air conditioning is 12v, as well as fridge & other appliances. Mainly want to be able charge batteries while on shore power as use Air conditioning.

Casper8572 · Apr 25, 2023

Yes it’s an RV, and yes air conditioning is 12v, as well as fridge & other appliances. Mainly want to be able charge batteries while on shore power as use Air conditioning

rodrick said:
You could just bring power to the charger only and run off your system while charging batteries from shore power not as efficient but no switch needed

Thank you, do you have any chargers that you recommend?

HRTKD · Apr 25, 2023

HRTKD said:
Is the Renogy inverter tied into the RV's main distribution panel?

This is important.

If the inverter is NOT tied into the RV's main distribution panel then you can simply plug the charger into a wall outlet and charge the battery bank.

If the inverter IS tied into the RV's main distribution panel then an ATS upstream of the main distribution panel is needed.

The charger in your diagram will work. It's only 30 amps, but that may be enough.

Casper8572 · Apr 25, 2023

Yes it’s an RV, and yes air conditioning is 12v, as well as fridge & other appliances. Mainly want to be able charge batteries while on shore power as use Air conditioning

rodrick said:
You could just bring power to the charger only and run off your system while charging batteries from shore power not as efficient but no switch needed

Thank you, do you have any chargers that you recommend

HRTKD said:
This is important.

If the inverter is NOT tied into the RV's main distribution panel then you can simply plug the charger into a wall outlet and charge the battery bank.

If the inverter IS tied into the RV's main distribution panel then an ATS upstream of the main distribution panel is needed.

The charger in your diagram will work. It's only 30 amps, but that may be enough.

Yes the AC 120v panel is wired directly to the inverter. Thank you

HRTKD · Apr 25, 2023

Casper8572 said:
Yes the AC 120v panel is wired directly to the inverter. Thank you

You need a transfer switch. But the charger has to be wired in upstream of the transfer switch.

Shore Power -> Charger Outlet ----\
...................................--> Automatic Transfer Switch
Inverter -------------------------/

Plug the charger into the charger outlet. There should be an AC breaker within the charger outlet to provide over current protection for the charger.

rodrick · Apr 25, 2023

If he wires the shore power only to the charger and nothing else he can run it without a transfer switch the only thing the shore power would power is the charger

Bought inverter without battery charger. So do I need auto transfer switch for 30a shore power? no generator

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