Mopeka pro universal

mikejay said:
I was thinking autosleeper may have added the carver capacity to get the 108. I dont use the carver as we just boil the kettle so its turned off so does not fill. I have tried it on a 20liter drum would not work on the empty same as my tank. No quality stars untill I got 5litres in it. Yeah noticed on my venus os pi it can show percentage and litres. And adjusting the height and bottom on venus you can get it to read something usefull if you remember when the mopeka gets under 12 litres it goes off and you still have 12 litres. But the lower quantity is what I really wanted the mopeka for😂 yeah my tank overflows from the top it has vent holes but if you turn the hose off straight away it soon stops.
Thanks Mike
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Just as an FYI and make things even more confusing for you .....

I now have a working Mopeka after changing the battery and it is fitted to the bottom of my Gaslow cylinder, which is an 11Kg bottle, which is what? 20L? Now that bottle is effectively empty (it is not sending any gas to applicances) and the Mopeka App reports the capacity as 3%, which is under 1L of fluid, so I don't think there is a general minimum value for the sensors to read a volume, especially considering their most usual use is LPG tanks and they are invariably much smaller than a water tank.

I've got some Duracell 3V 2032 Batteries coming tomorrow which are meant to have upto 70% longer run life so will fit one of those in the Fresh Water sensor and then do some testing.
 
mikejay said:
Iandsm, when you fitted yours did the quality stars light up on an empty tank. Mines on the bottom of my fresh watertank thats made from black plastic. And I have tried it with different amounts of grease and even without. And no matter what I can only get the quality stars to light with about 12litres in the tank. Mopeka got me to upgrade the firmware on it and it made no difference at all.

Thanks for your reply Mike
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Hi, just checked my three sensors and the fresh and waste tanks are empty = no stars, the LPG is 87% full and is showing three stars. I think the stars will only show when there is actually something to measure.
 
iandsm said:
Hi, just checked my three sensors and the fresh and waste tanks are empty = no stars, the LPG is 87% full and is showing three stars. I think the stars will only show when there is actually something to measure.
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does the waste sensor work ok (when there is something to measure)? I had heard the density of the waste water can cause false readings. But maybe that is more around black waste on American RVs rather than gray waste?
 
What would happen if you told the mopeka the tank was a quarter of its actual height?
Would it start being accurate when down to below a quarter full, by showing what proportion of the last quarter was remaining?
 
Geek said:
What would happen if you told the mopeka the tank was a quarter of its actual height?
Would it start being accurate when down to below a quarter full, by showing what proportion of the last quarter was remaining?
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No because once the quality stars go it cant measure anything and they go off at around 12litres on my tank. When tested on the 20litre drum I needed 5 litres to get 2 stars and make the sensor work.
 
iandsm said:
Hi, just checked my three sensors and the fresh and waste tanks are empty = no stars, the LPG is 87% full and is showing three stars. I think the stars will only show when there is actually something to measure.
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Now that's intresting as that is what I have been thinking because if you watch the mopeka instalation video it conviently skips to him with a bit of water in the tank🤔 but if that is the case mopeka never told me that they told me it was faulty. It better be faulty cost me near£10 to send it back today and if not faulty it's a pile of 💩 if it can't work with less than 12litres of water in the tank.
 
Martin P said:
If you want an accurate measure of fresh water in your your tank fit an inexpensive flow meter
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A flow meter tells you how much went past, but not necessarily how much is left.
If I want an accurate measure, I lift the seat and look at the translucent tank to see the level.
 
Martin P said:
As long as you set it when you fill your tank it will tell you to a litre how much you have left
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So your meter is fitted on the output of the tank, you can set it to a particular reading when the tank is full and it shows that reading all the time?
My water meter is not like that. It sits on the end of the fill hose and shows how many litres passed through in this session. Although it does keep a running grand total, that's neither useful nor easy to access.
Last time I filled the tank, it seemed to go in very slowly (the numbers were going up very slowly), and it was full after just 36 litres. Odd, that.
Then I looked more carefully and discovered that I'd accidently switched it to display in gallons instead of litres.
In the meantime I'd checked that the stoptap was properly on, that the outside tap was fully on, the stoptap on the inside of the wall was fully on and that the hose wasn't kinked.
Ah well, we live and learn.
 
Geek said:
I didn't know there was an installation video. Mine came without instructions.
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Yeah mine was the same just a sensor in a plastic bag with the plastic fitting ring,grease and the primer. I initially installed the wrong outdated app. But mopeka told me to get the copilot app and that would update the firmware which it did.
 
Geek said:
So your meter is fitted on the output of the tank, you can set it to a particular reading when the tank is full and it shows that reading all the time?
My water meter is not like that. It sits on the end of the fill hose and shows how many litres passed through in this session. Although it does keep a running grand total, that's neither useful nor easy to access.
Last time I filled the tank, it seemed to go in very slowly (the numbers were going up very slowly), and it was full after just 36 litres. Odd, that.
Then I looked more carefully and discovered that I'd accidently switched it to display in gallons instead of litres.
In the meantime I'd checked that the stoptap was properly on, that the outside tap was fully on, the stoptap on the inside of the wall was fully on and that the hose wasn't kinked.
Ah well, we live and learn.
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Yes we get days like that!
Yes my flow meter is fitted on the tank just after the pump. The display is by the kitchen sink. Each time I fill the tank I reset it and it reads 500 litres. When it reads 412 litres I run out of water. It may be simple but it is a real gamechanger for us. The standard tank gauge with 5 leds was next to useless
 
Replaced the Battery in my Water Tank Mopeka and now active again.
I don't know if the app has changed but I am sure I used to be able to set the function as Water rather than LPG but I can't any more.
The Victron setup still sees it as Water but the app doesn't and can't set the tank volume. Maybe a hidden setting in the app?
 
As a point of interest, when the standard Sargent water level bleeped and reported 0% full, I put a washing up bowl under the tap to see how much water would continue to come out ....
The bowl filled up (converting the dimensions to volume, it was a 15L bowl) and the water continued to flow for a fair time, overflowing the bowl. I would say must have got over 20 litres of water AFTER I was informed the tank had 0% remaining. 20 litres represents 25% of a full tank volume!
Now the sensor battery has been replaced and the tank taken from empty to full back to empty, the full range of measurements have gone through so will see what happens on the refill (where I will be also measuring with the flow meter on the input).
 
This Mopeka thingy is getting very confusing :) (or do I mean :( ? )

I filled the water tank up yesterday, using a water meter on the fill hose so I could record exactly what I was putting it (Checked the meter accuracy first and it is 100% right).
I stopped the tap every 5 litres and recorded information from the Victron System and the Mopeka App, and also noted what the 'native' water gauge was telling me (Sargent unit going from 0% to 100% in 25% steps).
To get percentages you have to tell the systems how high the tank is, bottom to top, and it uses the sensor reading to convert that to a percentage. On the Victron you add in a tank capacity to get an actual volume reading. Both assume by default that the water tank has a uniform box-like shape.
Problem: I don't know the the height of the tank! It looks like I decided it was 6.9cm when I first set it up, but with the current version of the Cerbox firmware, you can only set height by a full centimetre, which could be a pain on a long, wide but fairly shallow tank (like I have)

First gotcha ... My motorhome is parked on my driveway which has a bit of a slope downwards and a bit of a dip to the drivers side, so the tank is not perfectly level. But the tilt is not that bad to be uncomfortable, so just a note of a degree of inaccuracy. But ... should be consistant?
Second gotcha ... Having to go to the tap to start the flow for 5 litres, stop it and then go into the van to read the Sargent display meant water in the tank was moving around. So some readings may not have caught up by time noted?
I repeating taking notes when emptying water tank 5 litres at a time, but even though not getting in and out, was still moving around.

So taking that into account, I found some weird things :unsure:
Decided to change tank height to 10cm. Reason being it is easy to do the mental maths and can work out the correct height from the results. So set to 10Cm on both (Mopeka kept changing 10cm to 4 inches when chosing to display a diiferent way. It is a pretty crap application IMO).

First oddity .. The sensor value (i.e. liquid level) reported by the Victron is not the same as the value reported by the Mopeka App? Same sensor, different readings? how can that be the case? OK, could be reporting/refresh times as volume changes but too consistently different I think
Snapshot of some readings ....
First column is Victron, second is Mopeka App. Around a centimetre different or even more. and when a centimetre of height could represent potentially 15 litres, that is a big difference. How can the readings be different anyway?
7.3 cm8.7 cm
6.7 cm7.9 cm
6.6 cm7.9 cm
6.5 cm7.7 cm
5.8 cm7.0 cm
5.7 cm6.8 cm
4.9 cm5.9 cm
4.9 cm5.8 cm
4.2 cm5.0 cm

Right now with the tank empty and the drain tap open, the Victron setup says the sensor is reading 4.2cm and the Mopeka is reading 5cm. There will be a reading due to the thickness of the tank material (and in the Victron settings you can accomodate that) but it will be pretty small and less than 1 centimeter for sure.

I am going to repeat the controlled fill again, this time not getting into van and disturbing the suspension (last time I was keen to know at which points the Sargent moved to the next value, but only need to do that once really) and will move van onto tarmac in front of driveway, which is level.
 
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