Hi I have a RV with a victor 75 1 15 solar charger or MPPT. I added 2 lifpo batteries. My problem is after 100% charge on batteries and my fridge on DC after 15 hrs my batteries are dead. I have a solar panel which I think is 100w hooked up but it takes cover to charge. What am I doing wrong ? And my next step is to charge while driving DC/DC
Ok guys and gals if I am reading things correctly from the responses to other DIY newbies lol. # 1 my MPPT is the wrong Amp at only 15amp. #2 buy a separate DC/DC controller or up the one I have. Any thoughts will be much appreciated
Need to know more to diagnose.
What size are your batteries (Ah or Wh) and confirm they are in parallel for 12V or series for 24V. How do you know the batteries are at 100%, Bluetooth batteries possibly.
What type of fridge do you have, a lot of caravans / vehicles have the absorption type fridges that can run on propane, 12V DC or mains ac and on 12V DC they are hugely power hungry. A compressor fridge uses much less power. Look at your fridge nameplate or manual for expected power demand.I
Assuming 12V system you could fit 200W of panels, maybe 300W as long as you stay below 75V and 15A on the input, that will boost your charging.
We can then diagnose if you have large enough batteries for the fridge and enough charging.
I have 2 li-time group 34 100 amp 12v parrell to keep 12v the batteries have a BMS that is Bluetooth
So you have around 160Ah capacity with some reserve from full.
Most compressor fridges will use 1 to 2 Ah for every hour in use, so you should have 100 hours give or take if you have a compressor fridge.
If you have an absorption fridge then this will use 7-10 Ah for every hour in use, so around 20 hours max ignoring other loads. Absorption fridges are not great from 12V DC, ideally either powered by mains hook up, 12V when driving between camp sites or LPG, they were never meant to be run from batteries long term they are just too power hungry. If you have one of these and aim to run from batteries the best advice is replace with a compressor fridge.o
then you need to think about recharging and a single 100W panel is too small to support fridge use, especially an absorption fridge. As said, you could add anot her 2 panels of the same spec to get more charge.
Hi my batteries are 100 amp 12 volt in series positive to positive ground to ground for 12 volt operations. Also I have a Norcol fridge that is 3 way 12 volt ,propane and 120 a/c. I’ve tried running the propane like my other camper but it gets to hot and then I’d have to run a 12 v fan like an inducer fan if you will . However that suck the life of the batteries with in 6-8 hrs. If I don’t run a fan it pops a code and shuts down. So my thoughts was hook up DC/DC from my truck to keep the lifpo batteries charged #1. #2 is to find out if this MPPT is the wring one for my application and if so replace it?
Batteries connected positive to positive are in parallel to double capacity but still at 12V.
Any system design starts from understanding what power you use each day, that sets your battery capacity and your charging capacity. You need more charging so your plans are the right approach, finding the fridge power consumption will give you a target.
Ok then there parallel however this Victron community is junk I think I’ll switch my MPPT to a different brand there is no help more confusion on this site have a wonderful day
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