Hi all, A few years ago I had an electrician set up a Multiplus II and 4x12V 120Ah batteries in a 24V configuration for a “tiny home on wheels”. I usually use a caravan park mains supply and I have a small 2000W generator if needed. There is not a lot of drain on the batteries: lights are DC and f…

[image] Solar Charge Controllers - Victron Energy Get the highest attainable efficiency from sunlight, even if it is limited, with the solar charge controllers from Victron Energy. Find a dealer nearby. Have a look here, try the sizing calculator. You need an…

Thanks for this, it’s a new world for me… In another thread, it was mentioned that the solar system should deliver 20-25% of battery capacity so I figure I need 1200-1500W of solar. Using the sizing calculator, I can get this with 3 x 175W 12V panels and the MPPT 75/15. I only need the solar durin…

What you need is more to do with how much you use daily rather than the size of battery bank, and on boats, caravans and RVs the roof area. My boat is 700Ah of batteries at 12V and I have 700W of panels and typically use 100-150Ah (at 12V) daily and the 700W mostly covers this during spring and autu…

Thanks for this. Roof space is not a problem, the “RV” is a semi-trailer so I have (outside measurements) 11m x 2.5m of flat roof. A relative luxury. Do you recommend a way of determining daily use? And, technically, what happens if the solar provides more power than the batteries need? Does the M…

A solar panel has a current & power curve vs voltage as below. [17325598635085474184509660546347] When power is not required, the MPPT controller forces the panel voltage higher towards Voc where the current and power fall to zero. To know how much you use, look back at previous trips and see ho…

I did a power audit and it came to 70Ah per day on 24V so about 1700W per day. Yes, the fridge and freezer are about 60% of that. Pleasantly surprised that this corresponds to a little under 3 amps, about the mid-point of my irregular current monitoring over a 24 hour period. I presume I now use th…

That is about my use so it seems to be a reasonable result. Use a solar predictor for your location with flat mounted panels to get the required production.

Add Solar to Multiplus II 24/3000 70-32

DIY

pwfarnell 25 November 2024 09:22 2

Have a look here, try the sizing calculator. You need an MPPT controller, I recommend one of the Smart ones to communicate with VictronConnect on your phone. This will charge the batteries.

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Add Solar to Multiplus II 24/3000 70-32

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