Trotter
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At £279 , that’s very similar to the one on eBay at £219. Tbh, I reckon going the domestic route would be the better way to go. All we need is a vaccine, so we can all get away again.Lead Acid batteries - so can only take down to 50%, giving you a realistic usable capacity of 135Ah.
Your main fridge is 3-way, so that will be using very little battery power.
Solar Contribution ... just looked at my setup as a real-life example and with 460W of solar on a nice April day on Scotland, I have so far put in 70Ah into the battery with a couple of hours of decent harvesting left today (that 70Ah into the battery doesn't include the power the fridge is using either, so will actually be better than 70Ah from the solar).
So getting into the summer (and further south?), I would say a 200W system could make up the 40Ah the freezer would use? and a bad weather day will take around 30% of the USUABLE battery bank power
I don't think it is unrealistic to be able to run a little freezer like that Russell Hobbs one in the van in the summertime, especially if you are touring every few days
I had a look on Amazon to see the current price of the Waeco Coolfreezes (they are very efficient and work well as freezers as well). Currently still pricey but they fluctuate a lot in price (I bought a 36L one for just over £300 in the past, but I managed to catch that price at the right time - usually much more).
I did see this unit - https://amzn.to/2y0axGy . Not got any experience of these, but could be an possible option at £279 for an unit that I *think* is 200Wh/day (the spec writeup is a bit mixed-up. it quotes 0.2kW/h and I think that is meant to be 0.2kW/Day)?
Thanks again Dave. Feel free to plug anytime
Stay safe