Split charge relay stays made because of solar panel voltage?

[mitzimad]

Some excellent advice here my favourite being from tonyidle . I should have added that the relay does eventually drop out after a short time and I realise now that the fridge, if left on battery , pulls the voltage down and the relay will break before any harm is done. Also the idea from pappajohn is a good one except that it would mean running another wire all the way from front to back of the vehicle. The idea from steveand denise is a good one and I already have an intermediate relay switching the fridge so I might change this for a two pole one and route the solar input through it. Many thanks to all for some quick and sound advice

there is a way to get over the problem use a smartcom relay to trigger a larger dumb relay no dplus needed and if its a three way fridge run the fridge from the smartcom as well
smartcoms get a bad press as there rated at 30 amps but are not up to the job for long using it this way runs well within its capabilities

 

[Gromett]

Nope...
As soon as you turn the ign on before you even crank the engine, voltage will drop below the setpoint of the sens relay due to the amount of ancillaries go live and it will disconnect.

This debate was from over a year ago and I can't remember it all, and am not going to read it all back to respond sorry.

However, If you have a big enough solar array then the ancilleries going live will not cause that much of a voltage drop even a lift pump could be supplied quite happily by my 240Watt solar array without dropping any voltage.

I really don't like voltage sensing relays.

 

[Jaws]

It does sense voltage on one side only buy the problem is that once the relay is made the voltage is the same on either side until it breaks.

Sounds like they have used a thyristor instead of a triac

 

[JIXAMAN]

I installed a disconnect switch, I turn on before starting and I turn off before shutting down, no further issues so far, still to see a sunnier day though but I'm confident that's the problem and cure...

Kept the split charge relay only coz it's in there already where the switch could do away with it but it's a neat install the way it is...