inverter modification advice please

[snake]

hi friends,i have a small 12v wind turbine system.i will be using a 100A 12v battery with 2 ghurd's controller.1 for an lvd and one for dump controller.i will need to connect my 12v inverter to the lvd.ghurd advise me to use this schematic :

and also to use a reed relay instead of an automotive one because it uses less power.

i am having confusion between reed switch and reed relay.can someone help me with a schematic for the relay.

i also want to connect some led bulbs directly from the lvd

some advice are welcomed

thanks

[ghurd]

I will get a better sketch posted later.

G-

[tanner0441]

Hi

A reed switch is normaly operated by proximity of a permanent magnet. As the magnet is brought up to the reed it will change its state depending on whether it is normaly open or closed. Often used in door alarm systems.

A reed relay is a reed switch with a coil wound normally round the reed when the the coil is energised the reed will again change its state.

Reed units can be normaly open, normally closed, or single pole change over. One advantage of a reed is the speed of operation, several of the cheaper aneometers use a magnet on the rotor and reed mounted in the base, as the thing turns the reed operates and the pulses are counted by the electronics.

Like normal relays they come in various sizes and current ratings.

Brian

[ghurd]

This should help.

For simplicity:

Negative wires to the fet's Sources are not shown.

The power wires to the inverter are not shown.

The controller's sensor wires are not shown.

The switch in the relay coil line is necessary to turn the inverter Off when the battery is still OK.  The inverter's factory switch is left in the Off position.

Keep the amps per IRFZ44N below about 6A each.

If the LVD controller oscillates, the load is too large for the battery.

RX for an LVD should be 3K for about 0.8V hysteresis, or 3.9K for about 0.62V hysteresis.

G-

[snake]

thats nice from you ghurd.i really appreciate your help friends.i wanted to know 1 think.does the total load amps pass through the switch in the inverter?

[ghurd]

Very little current passes through the inverter switch.

Instead of switching 10A, 20A, or 50A in the inverters power wires,

the little relay only has to carry maybe 10ma to 50ma.

I believe it is less stressful for the inverter to use the inverter's own switching wires and circuits.

Lighted inverter switches can become more complicated.

G-

[snake]

so,in anyways,the reed relay will be able to handle the power switch amps.i thought that the total amps passes through the switch which maybe will burn the reed relay

[Opera House]

I think the initial contact switching current is higher than you expect.  If the reed switch is really small it could weld.  The fans are usually powered through this switch, so that gets you over 100ma.  Small 12V relays do not draw that much and can hold in easily at 6V.  Place a resistor in series with the coil equal to the coil resistance and place a 1,000 uF or higher cap across the resistor.