making power inverter work 2 ways.

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electricd7

Copper - Posts: 125

Joined: January 03, 2006

Posted: November 16, 2010 at 7:56 AM / IP Logged

Hello,

I currently have a power inverter installed in my truck. The wiring goes directly to the battery so the inverter is always on if needed. I want to wire in a switch, relay, and ignition wire so that I can make the inverter operate as follows:

- If the switch is in the ON position, the inverter should work as it always has

- If the switch is in the OFF position, the inverter should only operate if the ignition is on.

Can somone help me with the wiring and parts needed to accomplish this?? I could do it if I was only concerned with it working only with the ignition, but adding the switch and having it work in either way is confusing to me. Thanks

ED7

Thack79

Silver - Posts: 526

Joined: December 02, 2003

Location: Virginia, United States

Posted: November 16, 2010 at 10:00 AM / IP Logged

pull out the switch out of the power inverter. connect one to 87 and and the other to 30. connect 86 to ground and 85 to your igition or accessory or 12 volt switch.

electricd7

Copper - Posts: 125

Joined: January 03, 2006

Posted: November 16, 2010 at 10:22 AM / IP Logged

Thack79 - Seems like that would only allow the inverter to work when the coil is charged by the acc wire? Unless I am reading wrong? I want to have it work using a switch to make it either always on, or only one when the accessory is on.

Thack79

Silver - Posts: 526

Joined: December 02, 2003

Location: Virginia, United States

Posted: November 16, 2010 at 11:12 AM / IP Logged

with its connected to the accesory, it will entergize when the accessory is on and off when its not. If its connected to a 12 volt constant with a switch inbetween then it will work with the swtich.

Thack79

Silver - Posts: 526

Joined: December 02, 2003

Location: Virginia, United States

Posted: November 16, 2010 at 11:13 AM / IP Logged

im sure you can connect to both.

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: November 16, 2010 at 11:13 AM / IP Logged

Inverter neg side to switch.

Relay, ignition to 86, NOT ACC too much power drain unless engine is running.

Ground to 85 and 30

output side of above switch to 87.

The switch must be rated at at least 10amps.

I'm amazed you haven't had lots of flat battery problems with that set-up.

Thack79

Silver - Posts: 526

Joined: December 02, 2003

Location: Virginia, United States

Posted: November 16, 2010 at 11:20 AM / IP Logged

naw i havent had any problems, although i dont have the inverter on without the car started very often at all. the constant is still connected to the battery, im just controling the on/off swtich.

electricd7

Copper - Posts: 125

Joined: January 03, 2006

Posted: November 17, 2010 at 7:13 AM / IP Logged

Thanks for all the comments. I understand (i think) both methods of wiring this, however from what I can tell, neither will address my original question. The switch was supposed to only change the way the inverter operates. If the switch is on, the inverter should only function with the accessory/ignition charged. If the switch is off, the inverter should function all the time (ie, even when the car is off.) In both cases it appears to me that the inverter will only operate if the switch is in the ON position and the accessory/ignition wire is charging the coil?

electricd7

Copper - Posts: 125

Joined: January 03, 2006

Posted: November 17, 2010 at 7:20 AM / IP Logged

Perhaps I can just use a SPDT switch and then switch between relay ground and true ground. That should work. Would I then need a switch rated for 10A as well as a relay rated for 10A?

oldspark

Gold - Posts: 4,913

Joined: November 03, 2008

Location: Australia

Posted: November 17, 2010 at 2:47 PM / IP Logged

Inverter's power switch permanently on.

A relay to connect fused power to the inverter (eg, +12V to 30; 87 to inverter +12V).

Relay coil grounded (85).

IGN via diode (IN4004 etc) to coil +ve 86 (diode "line" = Kathode towards 86).

SPST "on" switch from +12V to 86 (could be from +12V on 30; though consider fusing issue (ie, use thin wire).

Summary - inverter is powered on if IGN is on OR if switch is on.

PS - BTW, relay & its power wiring and fuse rated for the inverter (eg, 10A for 100W inverter).

Switch and diode and relay "coil" wiring rated for the coil/solenoid - typically say 250mA or less for auto relays. IE - 1A or higher rated diodes etc should be more than enough.

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