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-   -   DC to DC and solar (https://www2.pajeroclub.com.au/forum/showthread.php?t=66751)

Herman4x4 24-03-20 08:33 PM

DC to DC and solar
 
Hello,
I have fitted a DC to DC fire alternator charging, yet to fit up for solar.

A solar question. When a solar panel is connected, does it charge the main battery first, then the aux battery?

It's a Projecta 25 amp.

Cheers,
Andrew.

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wazza5 24-03-20 09:41 PM

You will need to read manual. With most dc to dc the main purpose is for the solar to meet any demand on the battery first, then charge the battery and once it meets the required level then it will charge main battery.
The main purpose of the dc to dc charger is to charge the battery to which is connected to charge. Solar is another source to allow this, with the added bonus that it will charge the main if all other functions have been met.

sharkcaver 24-03-20 10:12 PM

The Projecta and all dc/dc chargers I am familiar with that have solar input will only charge the aux battery.

If you want to charge the starter, you will have to connect a regulated panel to that directly.

And if you only want to charge the starter, you will need to disconnect the idc from the starter.

Happy to be corrected on that.

sharkcaver 24-03-20 11:10 PM

Ok, so I have been informed the dcc pro from intervolt will back feed solar to a main battery if the main battery is fully charged (>12.8v). Which is sort of useless anyway I would think??

There may be others I do not know about.

My IDC and Redarc will not backfeed solar to the main battery. They will only feed the aux battery.

Kingbrown 25-03-20 06:57 AM

CTEK will definitely backfeed the solar input to the starter once the auxiliary has been fully charged.

Herman4x4 25-03-20 07:03 AM

Thanks for the responses. Might just connect to the main. The paj won't be getting used for a while so a good time to do it.
Cheers,
Andrew

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Mundy55 25-03-20 07:51 AM

Quote:

Originally Posted by sharkcaver (Post 629117)
Ok, so I have been informed the dcc pro from intervolt will back feed solar to a main battery if the main battery is fully charged (>12.8v). Which is sort of useless anyway I would think??

There may be others I do not know about.

My IDC and Redarc will not backfeed solar to the main battery. They will only feed the aux battery.

I have had an Intervolt dcc for several years and as far as I am aware and experienced, it does not charge the main battery but only the auxilliary when using solar. A great unit for a number of reasons but a limitation on solar input is it caps the charging voltage to 13.2V which greatly decreases solar panel effectiveness, notwithstanding it being an MPPT controller.

From where did you get that info, Sharkcaver? I think I'll have to go and read the manual again.

sharkcaver 25-03-20 12:40 PM

1 Attachment(s)
Quote:

Originally Posted by Mundy55 (Post 629137)
From where did you get that info, Sharkcaver? I think I'll have to go and read the manual again.

A forum member emailed me with a screen clip just after I posted. It appears to be from their manual. I just downloaded the manual from their site and its pretty basic in regards to solar, noting this is revision 2. The manual I was sent was probably the original manual. see scenario 2 in the attached clip:

Mundy55 26-03-20 07:43 AM

1 Attachment(s)
Quote:

Originally Posted by sharkcaver (Post 629150)
A forum member emailed me with a screen clip just after I posted. It appears to be from their manual. I just downloaded the manual from their site and its pretty basic in regards to solar, noting this is revision 2. The manual I was sent was probably the original manual. see scenario 2 in the attached clip:

Thanks, Sharkcaver. Having re-read my manual, what your friend did not indicate was that the info he provided was for 'voltage sense mode' in which the operation of the DCC-Pro is determined by the voltage of the main battery. However, the other mode available is 'ignition control mode' where the operation of the DCC-Pro is controlled by whether the ignition switch is on or off. This is the mode I have always used. In this mode, if the ignition switch is off, the main battery is isolated and the solar only charges the auxilliary. See scenario 3 in the attached. I had forgotten the about the first mode as I've never used it.


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