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#33012
Anonymous
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Hi Tom, a practical plan without a downside would be to ensure that the onboard converter-charger, the refer (if absorption type), and the hot water heater, etc do not become inadvertently energized when running from the inverter…This is to avoid the unintentional running down your batteries…Often, the refer when on LPG will sense the presence of 120v and then auto-switch to AC, often without your knowledge…

A better way to do this would depend somewhat on the type of inverter you have (i.e. conventional or a shore power ‘pass-thru’ design w/ATS)…

If conventional, then you would wire the incoming shore power cord in tandem to both the main panel and the ATS switch input…With this scheme:

1) when not on shore or generator power, the ATS will auto-switch to the inverter…

2) the ATS output goes to a sub-panel (with either power source – but does not feed the main!!).

3) the circuits you mentioned (microwave, house plugs, etc) are relocated from the main panel to the sub-panel.

4) it’s in this way that inverter power is directed only to the Sub and cannot go backwards to the Main, yet when on shore or genny power ALL circuits are active as was before…

5) this also ensures no sinusoidal conflict between shore and inverter.

6) if you are planning on a pass-thru inverter, then you’d want to make sure that it has a floating-neutral circuit (NEC code for RV’s), else you’ll experience nagging GFI issues…

7) yes, when dealing with low voltage d.c. (to reduce voltage losses and increase efficiency) it’s best to try and keep + & – cable lengths as fairly close and short as possible – this is called ‘balancing’…

8) don’t skimp on cable AWG gage, I generally upsize by one gauge over Mfg recommendations, just to ensure NO bottlenecks to the inverter (under high amp loads) which can cause nagging inverter alarms and shutdowns…

9) To avoid GFI issues (as per item 6), when installing the sub make sure that the neutral and the grounds are isolated at the buss-bar (easily done by installing a jumper wire).

Hope this helps,

Phil

BTW, the ATS is not a sub-psnel, perhaps you meant junction box…