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Parallel CCCV charger
#1
Hey,
for my project i want to use my battery only to store the energy from my solar panels i do not use that moment. Especially at noon. So i measure my solar input and my total input from the grid. To have something like a controlled charging that switches to higher charge powers on need i want to use parallel cccv chargers that can be switched by esp8266 powered relays as needed (like 100w +100w + 100w+100w) to charge the same battery pack.
I want to switch it on the input side because i heared it can be dangerous to connect input before the battery pack.

Is there anything i need to know or any concerns about this method?
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#2
Maybe try & do the switching with MOSFETs, much better with DC than relays :-)
You might be able to find CCCV devices with an logic level "enable" pin?
Running off solar, DIY & electronics fan :-)
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#3
Can you make a drawing on your intention to hook it Up?
Crimp Daddy likes this post
NOTE! My links supplied in this message may be affiliated with Ebay and by clicking on them you agree on the terms.
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Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
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#4
Not enough info given so I can only suggest other possible easier solutions like using a cc/cv chargers that are programmable through a serial connection like this https://www.ebay.com/itm/Programmable-DC...3581609257

Or if you use a mppsolar PIP inverter I believe it's possible to change the charging amps via the serial connection.

I'd rather do that trying to set relays to turn on and off a whole bunch of small chargers.
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#5
(08-16-2020, 04:01 PM)not2bme Wrote: Not enough info given so I can only suggest other possible easier solutions like using a cc/cv chargers that are programmable through a serial connection like this https://www.ebay.com/itm/Programmable-DC...3581609257

Or if you use a mppsolar PIP inverter I believe it's possible to change the charging amps via the serial connection.

I'd rather do that trying to set relays to turn on and off a whole bunch of small chargers.

I never saw that unit before... thanks for the link.  Do you know if they make a DC boost version of that?

Seems like it would be ideal for battery charging... I need something like this for 24v lion charging from a cars 12v system.
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#6
From the looks of it it's a step-down only. Eevblog did a review of it recently. https://www.youtube.com/watch?v=GUxszz_lo14

But for the step-up charger, the only one I know of may be just to use a MPT-7210a instead? Never used the unit myself so not sure if you can limit the current?
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#7
The MPT7210 have a current setting built in.
NOTE! My links supplied in this message may be affiliated with Ebay and by clicking on them you agree on the terms.
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
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#8
(08-21-2020, 10:27 AM)not2bme Wrote: From the looks of it it's a step-down only. Eevblog did a review of it recently. https://www.youtube.com/watch?v=GUxszz_lo14

But for the step-up charger, the only one I know of may be just to use a MPT-7210a instead? Never used the unit myself so not sure if you can limit the current?

Yes, I do have a MPT-7210a and it works just fine for that application... current limiting DC boost.  I was just curious if there were others.

Thanks for the youtube video link too.
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