question

garry13 avatar image
garry13 asked

No solar-charging

My system is installed in a Camper: 4 solarpanels, each 140Wp, one SmartSolar MPPT 150|35 , two SmartLithium 12v|200A batteries, one BMV 712 smart, one Blue Smart IP22 30A charger. One D+-relay connects/disconnects the motor-battery from the Lithium-batteries.

When the engine is running or by using the 220V-Charger, everything works fine: the batteries will be charged.

But as soon as the solarpanels should do the job (the sun is shining) I get something like this:

1683018861203.png

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These are the settings.

1683019008060.png

The "charge"-led an the BMS 12V | 200A is off. Charging seems to be blocked:

1683019450404.png

I checked the shortcut of the green plug (remote for charging): OK, the red cable has 12V.

I checked the cables between the solarpanels - no findings. Connecting the panels to an outside-solar-controller showed normal working:

1683019269832.png

Connecting other, outside panels to the system: no charging:

1683019828972.png

Honestly I am running out of possible solutions. Any ideas will be apprechiated !!


Gerhard



battery charging
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klim8skeptic avatar image klim8skeptic ♦ commented ·
@garry13 it looks like the fuse / breaker between the mppt and battery is faulty.


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garry13 avatar image garry13 klim8skeptic ♦ commented ·

Thanks for Your comment !

Where is this fuse ?

I can measure the normal battery voltage here:

1683021644914.png

Could this be the case, if a fuse between the mppt and the battery would be faulty??

Best wishes

Gerhard


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Matthias Lange - DE avatar image Matthias Lange - DE ♦ garry13 commented ·

There is no fuse at the MPPT, but there should be a fuse somewhere between the MPPT and the battery.

Please make a screenshot of the history tab of the MPPT (Verlauf).

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garry13 avatar image garry13 Matthias Lange - DE ♦ commented ·

Thanks for Your comment !

The last days there was not so much sun around and the 220V charger was working:

1683023801601.png

But 3 weeks ago on sunny days without 220V charger it looks like that:

1683023668411.png

The maximum was 41W from 540Wp solar panels. I think, this is not normal...


Best wishes

Gerhard


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klim8skeptic avatar image klim8skeptic ♦ garry13 commented ·

@garry13 I can measure the normal battery voltage here:

Not according to your overview screenshot. Batteries and shunt show 13.2xv, the mppt shows 13.49v (Or 14.19v).

Describe the devices between the mppt and battery.

How exactly does the BMS allow the 150-35 to charge?

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garry13 avatar image garry13 klim8skeptic ♦ commented ·

"Describe the devices between the mppt and battery.":

Between mppt and battery there is "only" the BMS and what is connected there is a lot: except the EBL and a fuel-cell (but not producing, only monitoring), other power consuming items like the parking heater, a power inverter to 220V, electric door, dry toilet (shrink and wrap), the ip22-charger, one connector of den D+-Relay. That should be all.


"Batteries and shunt show 13.2xv, the mppt shows 13.49v (Or 14.19v). "

If I disconnect the mppt from the solar-panels, the battery-voltage, measured at the mppt is the same, as at the battery itself. So I think the higher voltage is caused by the mppt - it tries to charge.


"How exactly does the BMS allow the 150-35 to charge?"

It is not a smart-BMS. So I can only see the charging conditions in BMV-712smart (I think, it is like this: if the voltage is 14 V - the battery if fully loaded - otherwise not)

1683024597231.png

Here is the setting of the mppt:

1683025443211.png

The "expert-mode" is off.


Hope this helps :-)


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