According to the spec sheets, the 75/10, 75/15, 100/15, 100/20 models have reverse battery polarity protection (and say nothing about reverse PV polarity protection) while the spec sheets for the 100/30 and 100/50 models say they have reverse PV polarity protection (and say nothing about reverse battery polarity protection). Is this correct? Do the different MPPT models have different polarity protection?
Where have you seen battery reverse polarity protection mentioned?
I was under the impression that all Victron MPPTs feature PV reverse polarity protection up to the PV shortcircuit current listed as max. But indeed, the technical specs in the manual of 100/30 and 100/50 MPPTs dont list it in the protections
I believe this is an error in the specs, but im not certain
I don’t know about the distinction between battery and PV. My understanding is that reverse polarity protection only applies when the short circuit current limit is respected. Refer to the datasheet of the actual model for this figure.
The specs of the 75/10, 75/15, 100/15, and 100/20 say they have reverse PV polarity protection, not reverse battery polarity protection: 9. Technical specifications
The datasheet of the 100/30 and 100/50 line also specifies reverse PV polarity protection, not reverse battery polarity protection: https://www.victronenergy.com/upload/documents/Datasheet-SmartSolar-charge-controller-MPPT-100-30-&-100-50-EN.pdf
Yes, as I indicated, the manual I have for the 100/30 & 100/50 indicated PV reverse protection.
What is interesting is that apparently the manual for the 75/15 through 100/20 seems to have changed from when I downloaded it. In the version currently on the website, it states PV reverse protection. But in the version that I downloaded when I bought my 75/15 it states battery reverse protection. So is that an error in the old manual or did the feature change (meaning older units do not have PV reverse protection)?
Ah - that’s because it has a replaceable fuse, so while you’ll facepalm and correct the install if you connect it backward, you can replace the fuse. Other models do not have a replaceable fuse, so you’ll be buying a new unit.
If you connect the battery back wards, it does not power on.
If then the user proceeds powers on solar things can go badly. Because thats when the real issue actually starts.
Ideally you would (follow the manual for cable connection sequence) connect the battery first. Program. Then (check pv polarity) power on pv to mppt to check charge.
If the pv is wrong it simply will either heat up or show voltage and no amps which should prompt a doubdle check of the PV.
Many a user have posted about the strange phenomenon.
If you connect and power up in the correct sequence catastrophic endings are avoided.
So the mppts can handle either side being reversed in certain circumstances.