Searching adaptive current charger following solar production

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BartDP

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Jan 22, 2021
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12
Hello All,

I have a battery set I like only to charge when my solar panels are injecting to the net.
This battery can take up to 50A @ 72V
Does someone knows if there exists chargers (working from 230Vac) only charging if I'm not using from the net but injecting in the net ?
For example by means of a current clamp on the incoming net wire sensing the injected current ?
As I'm living in the north, preferable a continuous charge current adjustment (aligned to the injection) is preferable.
At dark ,cloudy or rainy days I only have about 250 W to 600 W injection.

I found already solar inverters with current clamps but no chargers.

Kind regards.
 

OffGridInTheCity

Active member
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Dec 15, 2018
Messages
1,706
>not using from the net but injecting in the net ?
I'm not picturing what you're after. Could you explain a bit more the situation you want to solve?
 

daromer

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Oct 8, 2016
Messages
5,659
No there aint.

But a controllable charger and then a meter with a raspberry pi or an ESP chip and you can easily build it your self :)
 

BartDP

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Jan 22, 2021
Messages
12
>not using from the net but injecting in the net ?
I'm not picturing what you're after. Could you explain a bit more the situation you want to solve?
I only want to charge the wattage I would without charger inject to the net. Using kWh's from the net costs 10 time more then what we get for the injected kWh's
 

BartDP

New member
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Jan 22, 2021
Messages
12
No there aint.

But a controllable charger and then a meter with a raspberry pi or an ESP chip and you can easily build it your self :)
I know this is one of the solutions, but it is just this 'controllable charger' I'm after.
 

daromer

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Oct 8, 2016
Messages
5,659
Eltek chargers for instance can work. Then can be controlled externally.
 

OffGridInTheCity

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Dec 15, 2018
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1,706
I only want to charge the wattage I would without charger inject to the net. Using kWh's from the net costs 10 time more then what we get for the injected kWh's
@daromer gets it (good!) To me it sounds like your conditions can be met with a regular PV/charge controller (or charger) -> battery -> grid-tie inverter where you don't turn on the inverter till the battery is full-charged and turn the inverter off it the battery voltage drops a little below full-charge.
For example, I have one of these - https://www.amazon.com/ECO-WORTHY-1000W-Inverter-Limiter-System/dp/B095C6FTP6/ref=sr_1_1_sspa - and it's user programmable to turn on/off based on battery voltage.

*I think I'm just interested in understanding your use case more than anything - it sounds interesting.
 

BartDP

New member
Joined
Jan 22, 2021
Messages
12
@daromer gets it (good!) To me it sounds like your conditions can be met with a regular PV/charge controller (or charger) -> battery -> grid-tie inverter where you don't turn on the inverter till the battery is full-charged and turn the inverter off it the battery voltage drops a little below full-charge.
I don't want to change my current setup ( SMA Sunny Boy 5000TL-21, so no battery on this one only : PV-->SMA-->grid )
Additional, the battery I want to charge is a movable/mobile battery charged at another place then the SMA place.
(Maybe I should compare it to a EV car you charge with a 230Vac charger, no possibility to hook the EV directly to the PV cells/string )
So I don't see how a PV --> (MPPT) charge controller --> battery --> grid-tie inverter can help me.

So maybe I need to search within the controllable EV chargers ...
But would be nice if someone knows a payable soluation ( or even DIY solutions or example )
 
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