Battery Master & Moving Intelligence / MiPhantom alarm

[roxburd]

Does anyone have a Battery Master feeding a Moving Intelligence / MiPhantom alarm system?

My setup is keeping the leisure battery at a shade under 15v and the engine battery at 14v - by my cheap multimeter. But the MiPhantom app reports the battery continuing to lose charge... well, to be accurate, voltage. It's now down to 12.3v reported and right at the bottom of the green zone.

I realise that the alarm system is using a different circuit to measure the voltage than my simple multimeter. If that circuit tests how the battery is handling a representative load then it's a much better measure of battery health than a simple voltage reading. So while my multimeter says it's fine, the alarm says it's not and it might be the better judge.

So I'm just wondering - if anyone else has a similar setup, what voltage do you see your engine battery being kept at as reported by the app?

The power source to my system is a 100W solar panel. The van is only 3 years old.

Cheers

 

[G1969]

Yes, I have and it keeps it with the green 12.6- ish -below last three days with solar off

 

[autorouter]

That doesn't sound right at all. You can get voltage drops of over 1V if you are taking dozens of amps from a battery, along inadequate wires. Or if there is a bad connection somewhere, causing a resistance. But if you are measuring right at the battery terminals there should be no discrepancy.

First eliminate the multimeter. They can start reading high if the meter internal battery is on its way out. Ideally check with a second meter, but you could for example check that the leisure battery voltage is the same using the meter and the control panel display., to see if they agree.

 

[eddie]

I've yet to see a app reported engine battery voltage to be anywhere near accurate

It's not their primary job and to be honest whilst expensive to buy all are pretty cheaply made with the money being made from monitoring subscriptions

 

[Lenny HB]

Both of those voltages are way too high for storage they should be no more than 13.5v.

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[bigtree]

I use an Ablemail to keep the voltage up on my starter battery.

 

[roxburd]

Phew! The engine voltage reported by the app suddenly jumped up from 12.3v (right at the bottom of the green zone) to 12.6v at about 11am this morning... I guess the sun was out for a bit.

You're right - that multimeter does over-read. I'd forgotten that it does that. The control panel is probably more accurate and on Friday that was reporting 13v on the leisure battery and 12.3v on the engine battery. I guess that's within the intended Battery Master spec - when the difference gets to 0.7v the Battery Master spills charge over onto the engine battery.

Thanks guys - I just need to hope the sun keeps shining every few days!