With our new van we want to be able to travel for longer, not worry about the seasons and avoid too many expensive camp sites. To do these things a greater degree of self sufficiency when it comes to electrical power would be useful. We don’t have too many electrical devices, in fact the fridge and lights are probably the most demanding as well as enough juice to fire the hob and a bit of USB charging for phones and pads. The only real difference in our new van will be a 230V microwave for which we will need an inverter which will also be useful for charging tooth brushes, for the occasional hair drier and maybe a toaster.
Travelling in Norway this year we only used MHU (Mains Hook Up) once or twice to charge my toothbrush. Other than that travelling most days or parked up with solar kept us just about topped up although it got touch and go a couple of times. Van Blanc had a 110Ah leisure battery and a 100W solar panel and one advantage of a pop up roof is that we could get a better angle of incidence on the panel. So this time we have decided that overkill is a good plan, enough power for a few days parked up off grid and out of season.
Our van will come with a 98Ah starter battery and the larger 180A alternator so we are off to a good start.
We have bought two very large batteries, 12V 205Ah Leoch Gel Tubular Plate deep-cycle Powabloc from Alpha Batteries. These Gel Tubular Plate batteries have capacity ratings of 205Ah (100hr), 180Ah (20hr) with true deep-cycle and deep-discharge capabilities. They are sealed & maintenance-free and have a typical max. cycle life of 1500 cycles @ 80% DoD and come with 6-year warranty. The only minor draw back is that they weigh 60kg each but given that the van is rated at 3,5T we have a bit of headroom. They will sit on the floor out of sight ahead of the rear axle.
On the roof of the van we have space for 2 big solar panels so we have bought two 200W panels. These are Xplorer 1200 x 990 again from Alpha Batteries. They are a good quality German made panel that come with a 6 year warranty. I will have to devise some brackets that keep them low on the roof and an airfoil to reduce the wind resistance and any noise.
Next we have to manage the power, battery to battery charging from a Euro 6 source, solar charge control, mains hook up charging and all the other system management. Our previous vans were simpler and a learning curve but for this one we wanted a good integrated system. In the end we have got a complete Votronic system which is a little more expensive but should all integrate.
We will use a Votronic VBCS 60/40/430 Triple controller. This will manage the charge from the vehicle battery / alternator when we are on the, from the solar panels when the sun shines and from mains hook up. It can manage the input and charge from all three of these sources and look after the starter battery as well as the leisure batteries.
The controller itself will be monitored through a Votronic VPC Jupiter 400 panel with a blue tooth connector for a mobile phone app. Not only will it display current battery and charge states but it will warn if the levels are too low. In addition it will also provide switching for the water pump, monitor the fresh grey water tank levels and the inside and outside temperatures.
And then there is the occasional need for 230V which will be managed by a Votronic Inverter SMI 1700 ST NVS pure sine wave inverter. This will provide a steady 1700w to 230V outlets from batteries or direct from mains if hooked up. Being pure sine wave all sorts of electronics devices could be connected.
Of course there are all sorts of other wires, switches and plugs to take account of and make safe. There will be a Commando plug for mains hook up, a double pole consumer unit with reverse polarity warning and a couple of boxes of 12V fuses to protect everything.