Finally got round to a project I've been planning for a while. I have a waste water tank where the spare wheel would normally be and it drains with a large stopcock under the van
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Well I'd seen a review a couple of years ago on tv or Youtube of some big motorhome that could be drained by pressing a switch in the cab. It even had a camera underneath so you could position yourself over the grate. Being into gadgets and liking the idea of using my 360 camera to get myself over the drain grate and press a button without having to grovel under the van in the rain, I decided this would be a future project. Got hold of a 12v solenoid valve off ebay and tested the principle with a battery and a hosepipe, then as usual for me, stuck it on a shelf for a year or two.
Finally revived and got it all fitted today. First problem was that pressing the neat little switch I'd got for it (with a nice blue light when it was switched on) didn't trigger the solenoid. After doing some troubleshooting, the problem turned out to be the switch which had a ridiculously high resistance, +12.6v in and +10.5v out! I checked the others that I bought at the same time, another 5 all in different colours, and they all did the same. So beware, this is the switch type
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Anyway, after substituting with a different type of switch I got the correct voltage at the solenoid contacts. But the result is a failure. The pressure of the water in the tank is just not enough to get through the valve with any force. Unfortunately it's not like a gate opening to allow the water through, it has to push past a mechanism even when activated. So unfortunately when it's triggered all I get is a slow drip out of the end (yes I am over 50 so I'm used to it) like so
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So what have I done to my van today? Absolutely nothing, I've put it all back to how it was
But the bits and pieces won't be wasted. Coming this summer, a project to make a solar powered, solar heated, recirculating water warmer for my grandaughter's paddling pool