Forum Discussion

JRRNeiklot's avatar
JRRNeiklot
Explorer
Oct 27, 2016

Wiring charge controller to inverter

Is it ok if I connect the charge controller to the terminal posts on the inverter which then connects to the battery? Or do I need a separate connection straight from the charge controller to the battery?

I.E, Charge controller to inverter, and inverter to battery.

Thanks.

6 Replies

  • wa8yxm's avatar
    wa8yxm
    Explorer III
    I would connect to the battery end of the cables.. Here is the reason:

    When the inverter first kicks in it often does a test, during this test it may draw watts RATED/10 amps from the battery, then it stops and settles down to Watts-load/10 or there abouts.. For my inverter that initial "kick" is 200 amps.

    Not think of a water pipe.. You have wate flowing at say 20 GPM, and suddenly you slam the valve shut.. You hear the pipes ratteling throught the house. right. Well that pipe rattle in electronics is Inductive spike. the instant voltage at the inverter terminals can go from 12.6 of the batteries to 126 or more when it throttles back.. Depending on the size of the inverter 12 volt cables and the length of the run. The inverter can deal with this, the charge controler.. Will likely be damaged over time.

    Now at the battery end there is also a slight kick, that 12.6 may climb as high as 13 or 14, well within the charge controller's design parameters.
  • Electrically it is the same. Service wise just make sure if you are disconnecting power to service the inverter you need to disconnect the solar panels first. Controllers prefer to be connected to a battery if the solar is producing power.
  • Yes, that's a great way to connect, making those thick cables between the inverter and battery work in both directions rather than adding a second pair. It will also reduce the current they need to carry when using the inverter when the sun's up.
  • I would say yes also, but do you have a battery disconnect switch? If so doing it this way will disconnect the solar charge controller from the batteries when they are disconnected. On our MH the charge controller goes direct to the batteries so they get maintained even when the batteries are disconnected from the coach.
  • Yes, and you can also connect the converter output to the inverter input.

About Technical Issues

Having RV issues? Connect with others who have been in your shoes.24,358 PostsLatest Activity: Feb 08, 2026